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Table of Contents

DECnet Commands

DECnet Commands

Digital Equipment Corporation developed the DECnet protocol to provide a way for its computers to communicate with one another. Currently in its fifth major product release, DECnet Phase V is a superset of the Open System Interconnection (OSI) protocol suite, supports all OSI protocols, and is compatible with the previous release (Phase IV). DECnet Phase IV Prime supports inherent MAC addresses, which allow DECnet nodes to coexist with systems running other protocols that have MAC address restrictions. DECnet support on Cisco routers includes local-area and wide-area DECnet Phase IV routing over Ethernet, Token Ring, FDDI, and serial lines such as X.25, Frame Relay, and Switched Multimegabit Data Service (SMDS).

Use the commands in this chapter to configure and monitor DECnet networks. For DECnet protocol configuration information and examples, refer to the "Configuring DECnet" chapter of the Network Protocols Configuration Guide, Part 3


Note Not all Cisco access servers support DECnet. For more information, refer to the Release Notes for Cisco IOS Release 11.2.

access-list (extended)

To create an extended access list, use the access-list global configuration command. To delete the entire access list, use the no form of this command .

access-list access-list-number {permit | deny} source source-mask [destination
destination-mask]
no access-list

Syntax Description
access-list-number Integer you choose between 300 and 399 that uniquely identifies the access list.
permit Permits access when there is an address match.
deny Denies access when there is an address match.
source Source address. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50. All addresses are in decimal.
source-mask Mask to be applied to the address of the source node. All masks are in decimal.
destination (Optional) Destination node's DECnet address in decimal format. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50.
destination-mask (Optional) Destination mask. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50. All masks are in decimal.
Default

No access list is defined.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

In the following example, access list 301 is configured to allow traffic from any host in networks 1 and 3. It implies no other traffic is permitted. (The end of a list contains an implicit "deny all else" statement.)

access-list 301 permit 1.0 0.1023 0.0 63.1023
access-list 301 permit 3.0 0.1023 0.0 63.1023
Related Commands

access-list (filter connect initiate packets)
access-list (standard)
decnet access-group
decnet in-routing-filter
decnet out-routing-filter
show decnet interface

access-list (filter connect initiate packets)

To create an access list that filters connect initiate packets, use this version of the access-list global configuration command. To disable the access list, use the no form of this command .

access-list access-list-number {permit | deny} source source-mask
[destination destination-mask {eq | neq} [[source-object] [destination-object]
[identification]] any]

no access-list

The optional argument source-object consists of the following string:

src [{eq | neq | gt | lt} object-number] [exp regular-expression] [uic [group, user]]

The optional argument destination-object consists of the following string:

dst [{eq | neq | gt | lt} object-number] [exp regular-expression] [uic [group, user]]

The optional argument identification consists of the following string:

[id regular-expression] [password regular-expression] [account regular-expression]
Syntax Description
access-list-number Integer you choose between 300 and 399 that uniquely identifies the access list.
permit Permits access when there is an address match.
deny Denies access when there is an address match.
source Source address. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50. All addresses are in decimal.
source-mask Mask to be applied to the address of the source node. All masks are in decimal.
destination (Optional) Destination node's DECnet address in decimal format. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50. All addresses are in decimal.
destination-mask (Optional) Destination mask. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50. All masks are in decimal.
eq | neq Use either of these keywords:

· eq--Item matches the packet if all the specified parts of source-object, destination-object, and identification match data in the packet.

· neq--Item matches the packet if any of the specified parts do not match the corresponding entry in the packet.

source-object (Optional) Contains the mandatory keyword src and one of the following optional keywords:

· eq | neq | lt | gt--Equal to, not equal to, less than, or greater than. These keywords must be followed by the argument object-number, a numeric DECnet object number.

· exp--Stands for expression; followed by a regular expression that matches a string.

· uic--Stands for user identification code; followed by a numeric user ID (UID) expression.The argument [group, user] is a numeric UID expression. In this case, the bracket symbols are literal; they must be entered. The group and user parts can either be specified in decimal, in octal by prefixing the number with a 0, or in hex by prefixing the number with 0x. The uic expression displays as an octal number.

destination-object (Optional) Contains the mandatory keyword dst and one of the following optional keywords:

· eq | neq | lt | gt--Equal to, not equal to, less than, or greater than. These keywords must be followed by the argument object-number, a numeric DECnet object number.

· exp--Stands for expression; followed by a regular expression that matches a string.

· uic--Stands for user identification code; followed by a numeric user ID (UID) expression. In this case, the bracket symbols are literal; they must be entered. The group and user parts can either be specified in decimal, in octal by prefixing the number with a 0, or in hex by prefixing the number with 0x. The uic expression displays as an octal number.

identification (Optional) Uses any of the following three keywords:

· id--Regular expression; refers to user ID.

· password--Regular expression; the password to the account.

· account--Regular expression; the account string.

any Item matches if any of the specified parts do match the corresponding entries for source-object, destination-object, or identification.

See the "Regular Expressions" appendix in the Access Services Command Reference for a description of regular expressions.

Default

No access list is defined.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Depending upon the arguments you use, you can define access lists in three ways:

Use the source and source-mask arguments only.
Use the source, source-mask, destination, and destination-mask arguments.
Use the source, source-mask, destination, and destination-mask arguments, the eq | neq or any keywords and any or all of the following arguments: source-object, destination-object, and
identification.

Table 19 lists the DECnet object numbers.


Table  19:
Common DECnet Object Numbers
Name Number Description
FAL 17 File Access Listener
HLD 18 Host Loader
NML 19 Network Monitor Link/NICE
MIRROR 25 Loopback mirror
EVL 26 Event logger
MAIL 27 Mail
PHONE 29 Phone
NOTES 33 VAX Notes
CTERM 42 Terminal sessions
DTR 63 DECnet Test Sender/Receiver
Examples

The following example illustrates an access list for matching all connect packets for object number 27:

access-list 300 permit 0.0 63.1023 eq dst eq 27

The following example illustrates an access list for matching all connect packets except for the object number 17:

access-list 300 permit 0.0 63.1023 neq dst eq 17

The following example illustrates an access list for matching all connect packets where the access identification was SYSTEM:

access-list 300 permit 0.0 63.1023 eq id ^SYSTEM$

The following example illustrates an access list for matching all connect packets from area 1 to object number 27 (27 = VAX/VMS Personal Utility or MAIL) where SYSTEM is the originating user:

access-list 300 permit 1.0 0.1023 eq src exp ^SYSTEM$ dst eq 27

The following example illustrates an access list for matching any connect packet and can be used at the end of a list to permit any packets not already matched:

access-list 300 permit 0.0 63.1023 eq any
Related Commands

access-list (extended)
access-list (standard)
decnet access-group
decnet in-routing-filter
decnet out-routing-filter
show decnet interface

access-list (standard)

To create a standard access list, use the standard version of the access-list global configuration command. To delete the entire access list, use the no form of this command .

access-list access-list-number {permit | deny} source source-mask
no access-list

Syntax Description
access-list-number Integer you choose between 300 and 399 that uniquely identifies the access list.
permit Permits access when there is an address match.
deny Denies access when there is an address match.
source Source address. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50. All addresses are in decimal.
source-mask Mask to be applied to the address of the source node. Bits are set wherever the corresponding bits in the address should be ignored. All masks are in decimal.
Default

No access list is defined.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

In contrast with IP masks, a DECnet mask specification of "all ones" is entered as the decimal value 1023. In IP, the equivalent is 255.

Example

The following example sets up access list 300 to deny packets coming from node 4.51 and permit packets coming from 2.31:

access-list 300 deny 4.51 0.0 
access-list 300 permit 2.31 0.0
Related Commands

access-list (extended)
access-list (filter connect initiate packets)
decnet access-group
decnet in-routing-filter
decnet out-routing-filter
show decnet interface

clear decnet counters

To clear DECnet counters that are shown in the output of the show decnet traffic EXEC command, use the clear decnet counters EXEC command.

clear decnet counters
Syntax Description

This command has no arguments or keywords.

Command Mode

EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

The following example zeros all DECnet counters:

router# clear decnet counters
Related Command

show decnet traffic

decnet access-group

To create a DECnet access group, use the decnet access-group interface configuration command.

decnet access-group access-list-number
Syntax Description
access-list-number Either a standard or extended DECnet access list. A standard DECnet access list applies to source addresses. The value (or values in the case of extended lists) can be in the range 300 to 399.
Default

No access group is defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

The following example applies access list 389 to Ethernet interface 1:

interface ethernet 1
decnet access-group 389
Related Commands

access-list (standard)
show decnet interface

decnet advertise

To configure border routers to propagate Phase IV areas through an OSI backbone, use the decnet advertise global configuration command. To disable this feature, use the no form of this command.

decnet advertise decnet-area hops cost
no decnet advertise [decnet-area]

Syntax Description
decnet-area Phase IV area that you want propagated.
hops Hop count to be associated with the route being advertised. Default is 0.
cost Cost to be associated with the route being advertised. Default is 0.
Default

Disabled

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The output from the show decnet route EXEC command shows the cost and hop count for routes.

The decnet advertise command is used by border routers for propagating Phase IV areas through an OSI backbone.

The decnet advertise command and the clns route nsap-prefix discard command work together. When a router has DECnet Phase IV/V conversion enabled, any packet with the specified Connectionless Network Service (CLNS) Netwprk Service Access Point (NSAP) prefix will cause CLNS to behave as if no route were found. That router then looks up the route to the border router that is advertising the Phase IV route. In turn, the router that is advertising the DECnet Phase IV route converts the packet to Phase V and sends it through the OSI cloud to the border router that is advertising the CLNS discard static route. After the packet gets to the border router, it is converted back to Phase IV.

The CLNS discard routes are created dynamically when the advertised adjacencies are propagated through the CLNS cloud. When a DECnet interface is disabled, the adjacencies are lost and the CLNS discard route is deleted. The DECnet area routing states are displayed in the output from the show decnet route EXEC command.

Example

The following example shows a partial use of the decnet advertise command:

decnet conversion 49
decnet advertise 4
clns route 49.0001 discard
Related Commands

A dagger (+) indicates that the command is documented outside this chapter.

clns route discard +
show decnet route

decnet area-max-cost

To set the maximum cost specification value for interarea routing, use the decnet area-max-cost global configuration command.

decnet [network-number] area-max-cost value
Syntax Description
network-number (Optional) Network number from 0 to 3. Specified when using Address Translation Gateway (ATG). If not specified, the default is network 0.
value Maximum cost for a route to a distant area that the Cisco IOS software may consider usable; the software treats as unreachable any route with a cost greater than the value you specify. A valid range for cost is 1 to 1022. This parameter is only valid for area routers. The default is 1022.
Defaults

network-number: 0
value: 1022

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Be sure that you have used the decnet node-type area global configuration command before using this command.

Example

In the following example, the node type is specified as area and the maximum cost is set to 500. Any route with a cost exceeding 500 is considered unreachable by this router.

decnet node-type area
decnet area-max-cost 500
Related Commands

decnet area-max-hops
decnet node-type
show decnet interface

decnet area-max-hops

To set the maximum hop count value for interarea routing, use the decnet area-max-hops global configuration command.

decnet [network-number] area-max-hops value
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
value Maximum number of hops for a usable route to a distant area. The Cisco IOS software treats as unreachable any route with a count greater than the value you specify. A valid range for the hop count is 1 to 30. The default is 30 hops.
Default

30 hops

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

This command is only valid for area routers. Be sure that you have issued the decnet node-type area global configuration command before using this command.

Example

The following example sets the router to be a Level 2 router, then sets a maximum hop count of 21:

decnet node-type area
decnet area-max-hops 21
Related Commands

decnet area-max-cost
decnet node-type
show decnet interface

decnet congestion-threshold

To set the congestion- experienced bit if the output queue has more than the specified number of packets in it, use the decnet congestion-threshold interface configuration command. To remove the parameter setting and set it to 0, use the no form of this command .

decnet congestion-threshold number
no decnet congestion-threshold

Syntax Description
number Number of packets that are allowed in the output queue before the system sets the congestion experience bit. This value is an integer between 0 and 0x7fff. The value zero prevents this bit from being set. Only relatively small integers are reasonable. The default is 1 packet.
Default

1 packet

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

If a router configured for DECnet experiences congestion, it sets the congestion-experienced bit. A number value of zero or the no form of the command prevents this bit from being set.

Example

The following example sets the congestion threshold to 10:

interface ethernet 0
decnet congestion-threshold 10

decnet conversion

To allow Phase IV routers (running Release 9.1 or higher) to run in a Phase V network and vice versa, enable conversion with the decnet conversion global configuration command. To disable conversion, use the no form of this command.

decnet conversion nsap-prefix
no decnet conversion nsap-prefix

Syntax Description
nsap-prefix Value used for the IDP field when constructing NSAPs from a Phase IV address.
Default

Disabled

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

To enable DECnet conversion, you must configure both DECnet and ISO CLNS on your router.

DECnet Phase V is OSI-compatible and conforms to the ISO 8473 (CLNP/CLNS) and
ISO 9542 (ES-IS) standards. Digital has defined algorithms for mapping a subset of the Phase V address space onto the Phase IV address space and for converting Phase IV and Phase V packets back and forth. This allows a network administrator to support both Phase IV hosts in Phase V networks and Phase V hosts in Phase IV networks.

Cisco's implementation differs from Digital's in how reachability information is advertised. Cisco's implementation allows you to add Phase V support without modifying your existing Phase IV support. It also delays converting packets from Phase IV to Phase V, while Digital's implementation converts as soon as possible.

It is essential that the area you specify in the decnet routing global configuration command is the same as the local area you specified with the net router configuration command for the CLNS network.

Be sure that the area you specify in the decnet conversion command is the same as the area you specified for the CLNS network. Also note that the DECnet area is specified in decimal, and the CLNS area is specified in hexadecimal.

The decnet routing command is specified with a decimal address, while the net command address is specified in hexadecimal. In addition, the nsap-prefix specified on the decnet conversion command must match one of the NETs for this router.

The following guidelines apply:

Example

The following example enables DECnet conversion on a router with the area tag xy and Phase IV address 20.401 using an ISO IGRP router:

clns routing
decnet routing 20.401
decnet max-address 600
!
router iso-igrp xy
net 47.0004.004d.0014.aa00.0400.9151.00
!
decnet conversion 47.0004.004d
!
interface ethernet 0
decnet cost 4
clns router iso-igrp xy
Related Commands

A dagger (+) indicates that the command is documented outside this chapter.

net +
show decnet interface
show decnet route

decnet cost

To set a cost value for an interface, use the decnet cost interface configuration command. To disable DECnet routing for an interface, use the no form of this command.

decnet cost cost-value
no decnet cost

Syntax Description
cost-value Integer from 1 to 63. There is no default cost for an interface, although a suggested cost for FDDI is 1, for Ethernet is 4, and for serial links is greater than 10.
Default

Disabled

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The decnet cost command is required for each interface on which DECnet routing is configured.

After DECnet routing has been enabled, you must assign a cost to each interface over which you want DECnet to run. Assigning a cost in effect enables DECnet routing for an interface. Most DECnet installations have an individualized routing strategy for using costs. Therefore, check the routing strategy used at your installation to ensure that costs you specify are consistent with those set for other hosts on the network.

Example

The following example establishes a DECnet routing process for a router and sets the router's DECnet address to 21.456, then sets a cost of 4 for the Ethernet interface 0:

decnet routing 21.456
interface ethernet 0
decnet cost 4
Related Commands

decnet encapsulation
decnet node-type
decnet routing
show decnet interface
show decnet route

decnet encapsulation

To provide DECnet encapsulation over Token Ring, use the decnet encapsulation interface configuration command.

decnet encapsulation {pre-dec | dec}
Syntax Description
pre-dec Configures routers for operation on the same Token Ring with routers running software versions prior to Release 9.1. In this mode, Cisco routers cannot communicate with non-Cisco equipment. Referred to as Cisco-style encapsulation.
dec Provides encapsulation that is compatible with other Digital equipment. All Cisco routers must be running Release 9.1 or later.
Default

Encapsulation is compatible with other Digital equipment.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

If you have both Release 9.0 and 9.1 routers in the same network, you must use the pre-dec encapsulation type on the 9.1 routers.


Note You must first enable DECnet routing on the selected Token Ring interface before you can configure the DECnet encapsulation mode.
Example

The following example sets Cisco-style encapsulation for DECnet routing, which means that Cisco and Digital equipment will not interoperate over Token Ring:

interface tokenring 0
decnet encapsulation pre-dec
decnet cost 4
Related Commands

decnet cost
show decnet interface

decnet hello-timer

To change the interval for sending broadcast hello messages, use the decnet hello-timer interface configuration command. To restore the default value, use the no form of this command.

decnet hello-timer seconds
no decnet hello-timer

Syntax Description
seconds Interval at which the Cisco IOS software sends hello messages. It can be a decimal number in the range 1 to 8191 seconds. The default is 15 seconds.
Default

15 seconds

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The Cisco IOS software broadcasts hello messages on all interfaces with DECnet enabled. Other hosts on the network use the hello messages to identify the hosts with which they can communicate directly. On extremely slow serial lines, you may want to increase the default value to reduce overhead on the line.

Example

The following example increases the hello interval to 2 minutes (120 seconds) on serial interface 1:

interface serial 1
decnet hello-timer 120
Related Command

show decnet interface

decnet host

To associate a name-to-DECnet address mapping, use the decnet host global configuration command, which shows up in the output of various commands. To disable name mapping, use the no form of this command.

decnet host name decnet-address
no decnet host name

Syntax Description
name A name you choose that uniquely identifies this DECnet address.
decnet-address Source address. DECnet addresses are written in the form area.node. For example, 50.4 is node 4 in area 50. All addresses are in decimal.
Default

No name is defined.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

The assigned name is displayed, where applicable, in show decnet route and show hosts EXEC command output.

The name can also be used with the ping decnet command.

Example

The following example defines name-to-DECnet address mapping:

decnet host cisco1 3.33
Related Commands

A dagger (+) indicates that the command is documented outside this module.

ping (privileged)
show decnet route
show hosts
+

decnet in-routing-filter

To provide access control to hello messages or routing information received on an interface, use the decnet in-routing-filter interface configuration command. To remove access control, use the no form of this command.

decnet in-routing-filter access-list-number
no decnet in-routing-filter

Syntax Description
access-list-number Standard DECnet access list. This list applies to source addresses. The value can be in the range 300 to 399.
Default

No access control is defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

In the following example, Ethernet interface 0 is set up with a DECnet in-routing filter of 321, which means that any hello messages sent from addresses that are denied in list 321 are ignored. Additionally, all node addresses listed in received routing messages on this interface are checked against the access list, and only routes passing the filter are considered usable.

interface ethernet 0
decnet in-routing-filter 321
Related Commands

access-list (standard)
decnet out-routing-filter
show decnet interface

decnet map

To establish an address translation for selected nodes, use the decnet map global configuration command.

decnet first-network map virtual-address second-network real-address
Syntax Description
first-network DECnet network numbers in the range 0 to 3.
virtual-address Numeric DECnet address (10.5, for example).
second-network DECnet network number you map to; DECnet numbers range 0 to 3.
real-address Numeric DECnet address (10.5, for example).
Default

No address translation is defined.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Keep the following limitations in mind when configuring the ATG:

As an additional feature and security caution, DECnet "Poor Man's Routing" can be used between nodes outside of the translation map as long as those nodes have access to nodes that are in the map, so that a user on node B could issue the following VMS command:

$ dir A::D::E::

When a Poor Man's Routing connection is made between two networks, only the two adjacent nodes between the networks will have any direct knowledge about the other network. Application-level network access may then be specified to route through the connection.


Note We do not support "Poor Man's Routing" directly; the intermediate nodes must be VMS systems with "Poor Man's Routing" enabled in file-access language.
Example

In the following example, packets in Network 0 sent to address 19.5 will be routed to Network 1, and the destination address will be translated to 50.1. Packets sent to address 47.1 in Network 1 will be routed to Network 0 as 19.1.

decnet 0 map 19.5 1 50.1
decnet 1 map 47.1 0 19.1
Related Command

show decnet map

decnet max-address

To configure the Cisco IOS software with a maximum number of node addresses, use the decnet max-address global configuration command.

decnet [network-number] max-address value
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
value A number less than or equal to 1023 that represents the maximum address possible on the network. In general, all routers on the network should use the same value for this argument. The default is 1023.
Default

1023 node addresses

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

DECnet routers do not have the concept of aging out a route. Therefore, all possible areas or nodes must be advertised as unreachable if they cannot be reached. Since it is best to keep routing updates small, you must indicate the default maximum possible node and area numbers that can exist in the network.

Example

The following example configures a small network to a maximum address value of 300:

decnet max-address 300
Related Command

decnet max-area

decnet max-area

To set the largest number of areas that the Cisco IOS software can handle in its routing table, use the decnet max-area global configuration command.

decnet [network-number] max-area area-number
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
area-number Area number from 1 to 63. Like the decnet max-address global configuration command value, this argument controls the sizes of internal routing tables and of messages sent to other nodes. All routers on the network should use the same maximum address value. The default is 63.
Default

63 areas

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

In the following example, the largest area to be stored in the routing table is 45:

decnet max-area 45
Related Commands

decnet max-address
show decnet interface

decnet max-cost

To set the maximum cost specification for intra-area routing, use the decnet max-cost global configuration command.

decnet [network-number] max-cost cost
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
cost Cost from 1 to 1022. The default is 1022.
Default

1022

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The Cisco IOS software ignores routes within its local area that have a cost greater than the value you specify.

Example

In the following example, the node type is specified as a Level 1 router and the maximum cost is set to 335. Any route whose cost exceeds 335 is considered unreachable by this router.

decnet node-type routing-iv
decnet max-cost 335
Related Commands

decnet max-hops
decnet max-paths
decnet node-type
decnet path-split-mode
show decnet interface

decnet max-hops

To set the maximum hop count specification value for intra-area routing, use the decnet max-hops global configuration command.

decnet [network-number] max-hops hop-count
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
hop-count Hop count from 1 to 30. The Cisco IOS software ignores routes that have a hop count greater than the corresponding value of this parameter. The default is 30 hops.
Default

30 hops

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

The following example sets the router to be a Level 1 router, then sets a maximum hop count of 2:

decnet node-type routing-iv
decnet max-hops 2
Related Commands

decnet max-cost
decnet max-paths
decnet multicast-map
decnet node-type

decnet max-paths

To define the maximum number of equal-cost paths to a destination that the Cisco IOS software keeps in its routing table, use the decnet max-paths global configuration command.

decnet [network-number] max-paths value
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
value Decimal number equal to the maximum number of equal-cost paths the software will save. The valid range is 1 to 31. The default is 1.
Default

1 equal-cost path

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Limiting the number of equal-cost paths can save memory on routers with limited memory or very large configurations. Additionally, in networks with a large number of multiple paths and end-systems with limited ability to cache out-of-sequence packets, performance may suffer when traffic is split between many paths.

Limiting the size of the routing table does not affect your routers's ability to recover from network failures transparently, provided that you do not make the maximum number of paths too small. If more than the specified number of equal-cost paths exist, and one of those paths suddenly becomes unusable, the software wills discover an additional path from the paths it has been ignoring.

Example

In the following example, the software will save no more than three equal-cost paths:

decnet max-paths 3
Related Commands

decnet max-cost
decnet max-hops
decnet path-split-mode
show decnet interface
show decnet route

decnet max-visits

To set the limit on the number of times a packet can pass through a router, use the decnet max-visits global configuration command.

decnet [network-number] max-visits value
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
value Number of times a packet can pass through a router. It can be a decimal number in the range 1 to 63. If a packet exceeds value, the Cisco IOS software discards the packet. Digital recommends that the value of the max-visits parameter be at least twice that of the max-hops parameter, to allow packets to still reach their destinations when routes are changing. The default is 63 times.
Default

63 times

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

The following example of intra-area routing configuration specifies Level 1 routing, a maximum hop count of 28, and maximum number of visits of 62 (which is more than twice 28):

decnet node-type routing-iv
decnet max-hops 28
decnet max-visits 62
Related Commands

decnet max-hops
show decnet interface
show decnet traffic

decnet multicast-map

To specify a mapping between DECnet multicast addresses and Token Ring functional addresses, other than the default mapping, use the decnet multicast-map interface configuration command. To delete the specified information, use the no form of this command.

decnet multicast-map multicast-address-type functional-address
no decnet multicast-map
multicast-address-type functional-address
Syntax Description
multicast-address-type Type of multicast address that is used. The following are valid values for the argument:

· iv-all-routers (All Phase-IV routers)

· iv-all-endnodes (All Phase-IV end nodes)

· iv-prime-all-routers (All Phase IV Prime routers)

functional-address Functional MAC address to which this multicast ID maps; in the form of "c000.xxxx.yyyy."
Default

Enabled, with the default mapping listed in Table 20.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

This command is valid for Token Ring interfaces only. The command will reject a functional address that does not start with "C000" or "c000."

Routing multicasts and end node multicasts must be on different functional addresses.


Table  20: Default Mapping of DECnet Multicast Address Types and Token Ring Functional Addresses
DECnet Multicast Address Type Token Ring Functional Address
L1 router
L2 router
C000.1000.0000
End node C000.0800.0000
DECnet Phase IV-Prime router C000.1000.0000
Example

In the following example, Token Ring interface 1 is configured for multicasts of all Phase IV end nodes and the multicast ID is configured to map to MAC address c000.2222.3333.

interface tokenring 1
decnet multicast-map iv-all-endnodes c000.2222.3333

decnet node-type

To specify the node type, use the decnet node-type global configuration command.

decnet [network-number] node-type {area | routing-iv}
Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
area Router participates in the DECnet routing protocol with other area routers, as described in the Digital documentation, and routes packets from and to routers in other areas. This is sometimes referred to as Level 2 (or interarea) routing. An area router does not just handle interarea routing, it also acts as an intra-area or Level 1 router in its own area.
routing-iv Router acts as an intra-area (standard DECnet Phase IV, Level 1 router) and ignores Level 2 routing packets. In this mode, it routes packets destined for other areas to a designated interarea router, exchanging packets with other end nodes and routers in the same area.
Default

No node type is specified.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

In the following example, the router node type is specified as area, or Level 2:

decnet node-type area
Related Commands

decnet cost
decnet routing
show decnet interface

decnet out-routing-filter

To provide access control to routing information being sent out on an interface, use the decnet out-routing-filter interface configuration command. To remove access control, use the no form of this command .

decnet out-routing-filter access-list-number
no decnet out-routing-filter

Syntax Description
access-list-number Standard DECnet access list applying to source addresses. The value can be in the range 300 to 399.
Default

No access control to routing information is defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Addresses that fail this test are shown in the update message as unreachable.

Example

In the following example, Ethernet interface 1 is set up with a DECnet out-routing filter of 351. This filter is applied to addresses in the transmitted routing updates. Transmitted hello messages are not filtered.

interface ethernet 1
decnet out-routing-filter 351
Related Commands

access-list (standard)
decnet in-routing-filter
show decnet interface

decnet path-split-mode

To specify how the Cisco IOS software splits the routable packets between equal-cost paths, use the decnet path-split-mode global configuration command with the appropriate keyword.

decnet path-split-mode {normal | interim}
Syntax Description
normal Normal mode, where equal-cost paths are selected on a round-robin basis. This is the default.
interim Traffic for any particular (higher-layer) session is always routed over the same path. This mode supports older implementations of DECnet (VMS Versions 4.5 and earlier) that do not support out-of-order packet caching. Other sessions may take another path, thus using equal-cost paths that a router may have for a particular destination.
Default

Normal mode

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Example

In the following example, a router will split routable packets between equal-cost paths using the round-robin (or first-come, first-served) basis:

decnet path-split-mode normal
Related Commands

decnet max-cost
decnet max-paths

decnet propagate static

To enable static route propagation, use the decnet propagate static global configuration command. To disable propagation, use the no form of this command.

decnet propagate static
no decnet propagate static

Syntax Description

This command has no arguments or keywords.

Default

No default routes are propagated.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.0

By default, DECnet static routes are not propagated to other routers. Use the decnet propagate static command to enable static route propagation. A default route is used only after DECnet conversion is checked.

Example

The following example shows how to enable static route propagation for the specified static and default routes:

decnet propagate static
!
decnet route 3.0 ethernet 0 aa00.0400.0404
decnet route 5.0 serial 0
decnet route 5.100 serial 2
decnet route default 2.100
decnet route 6.0 2.3 4 5
Related Commands

decnet route (interface static route)
decnet route (to enter a static route)
show decnet
show decnet static

decnet route (interface static route)

To create an interface static route, use this version of the decnet route global configuration command. To remove this route, use the no form of this command.

decnet route decnet-address next-hop-type number [snpa-address] [hops [cost]]
no decnet route
decnet-address next-hop-type number
Syntax Description
decnet-address DECnet address. This value is entered into a static routing table and used to match a destination DECnet address. Use a node address value of 0 to specify an area static route.
next-hop-type Interface type.
number Interface number.
snpa-address (Optional) Optional for serial links; required for multiaccess networks.
hops (Optional) Hop count to be associated with the route being advertised. Default is 0.
cost (Optional) Cost to be associated with the route being advertised. Default is 0.
Default

No interface static routes are created.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

If you do not specify a Subnetwork Point of Attachment (SNPA) address when you have a multiaccess network, you receive an error message indicating a bad SNPA. By default, DECnet static routes are not propagated to other routers. Use the decnet propagate static command to enable propagation.

Examples

The following example shows how to create a static route for a serial interface. No SNPA need be specified for point-to-point interfaces.

decnet route 3.1 serial 1

The following example shows how to create a static route for an Ethernet interface. The SNPA must be specified for an interface that is not point-to-point.

decnet route 3.2 ethernet 1 aa00.0400.0104 
Related Commands

decnet propagate static
decnet route (to enter a static route)
decnet route default (interface default route)
decnet route default (to enter a default route)
show decnet static

decnet route (to enter a static route)

To enter a specific static route, use this version of the decnet route global configuration command. DECnet addresses that match are forwarded to the next-hop-address. To remove this route, use the no form of this command.

decnet route decnet-address next-hop-address [hops [cost]]
no decnet route
decnet-address next-hop-address
Syntax Description
decnet-address DECnet address. This value is entered into a static routing table and used to match a destination DECnet address. Use a node address value of 0 to specify an area static route.
next-hop-address This value is used to establish the next hop of the route for forwarding packets.
hops (Optional) Hop count to be associated with the route being advertised. Default is 0.
cost (Optional) Cost to be associated with the route being advertised. Default is 0.
Default

No interface static routes are created.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

Area static routes can be configured by specifying a DECnet node address of 0. By default, DECnet static routes are not propagated to other routers. Use the decnet propagate static command to enable propagation.

Examples

The following example shows how to create a static route for 1.1 that points to 1.9 and uses default values of 0 for the hops and cost:

decnet route 1.1 1.9

The following example shows how to create a static route for 3.100 that points to 3.4 and specifies values for the hops and cost:

decnet route 3.100 3.4 9 8

The following example shows how to create a static route for area 1 that points to 2.999:

decnet route 1.0 2.999 
Related Commands

decnet propagate static
decnet route (interface static route)

decnet route default (interface default route)
decnet route default (to enter a default route)
show decnet static

decnet route default (interface default route)

To create an interface default route, use this version of the decnet route default global configuration command. To remove this route, use the no form of this command removes this route.

decnet route default next-hop-type number [snpa-address] [[hops [cost]]
no decnet route default
next-hop-type number
Syntax Description
next-hop-type Interface type.
number Interface number.
snpa-address (Optional) Optional for serial links; required for multiaccess networks.
hops (Optional) Hop count to be associated with the route being advertised. Default is 0.
cost (Optional) Cost to be associated with the route being advertised. Default is 0.
Default

No interface default routes are created.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.0

If you do not specify an SNPA address when you have a multiaccess network, you receive an error message indicating a bad SNPA.

A default route is used only after DECnet conversion is checked. DECnet default routes are not propagated to other routers.

Examples

The following example shows how to create a default route for a serial interface. No SNPA need be specified for point-to-point interfaces.

decnet route default serial 1

The following example shows how to create a default route for an Ethernet interface. The SNPA must be specified for an interface that is not point-to-point.

decnet route default ethernet 1 aa00.0400.0104 
Related Commands

decnet propagate static
decnet route (interface static route)
decnet route default (interface default route)
decnet route default (to enter a default route)
show decnet static

decnet route default (to enter a default route)

To enter a specific default route, use this version of the decnet route default global configuration command. To remove this route, use the no form of this command.

decnet route default next-hop-address [hops [cost]]
no decnet route default
next-hop-address
Syntax Description
next-hop-address This value is used to establish the next hop of the route for forwarding packets.
hops (Optional) Hop count to be associated with the route being advertised. Default is 0.
cost (Optional) Cost to be associated with the route being advertised. Default is 0.
Default

No interface default routes are created.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

A default route is used only after DECnet conversion is checked. By default, DECnet static routes are not propagated to other routers. Use the decnet propagate static command to enable propagation.

DECnet packets not for the current area are forwarded to the next-hop-address.

Example

The following example shows how to create a default route for 1.3 which uses default values of 0 for hops and cost:

decnet route default 1.3
Related Commands

decnet propagate static
decnet route (interface static route)
decnet route (to enter a static route)
decnet route default (interface default route)
show decnet static

decnet route-cache

To enable fast switching, use the decnet route-cache interface configuration command. To disable fast switching, use the no form of this command.

decnet route-cache
no decnet route-cache

Syntax Description

This command has no arguments or keywords.

Default

Enabled

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

By default, Cisco's DECnet routing software implements fast switching of DECnet datagrams. There are times when it makes sense to disable fast switching. This is especially important when using rates slower than T1.

Fast switching uses memory space on interface cards. In situations where a high-bandwidth interface is writing large amounts of information to a low-bandwidth interface, additional memory could help avoid congestion on the slow interface.

Example

In the following example, fast switching is disabled on Ethernet interface 0:

interface ethernet 0
no decnet route-cache

decnet router-priority

To elect a designated router to which packets are sent when no destination is specified, use the decnet router-priority interface configuration command.

decnet router-priority value
Syntax Description
value Priority of the router. This can be a number in the range 0 to 127. The larger the number the higher the priority. The default priority is 64.
Default

64

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The designated router is the router to which all end nodes on an Ethernet communicate if they do not know where else to send a packet. The designated router is chosen through an election process in which the router with the highest priority gets the job. When two or more routers on a single Ethernet in a single area share the same highest priority, the unit with the highest node number is elected. You can reset a router's priority to help ensure that it is elected designated router in its area.

On a LAN with both DECnet IV and DECnet IV Prime hosts, make sure that a bilingual router always becomes the designated router.

DECnet end systems use the designated router only when they have no other information about how to reach a particular system. The end systems maintain a cache of how to reach other systems on the network. The cache contains the following information:

<remote system DECnet address>  <next hop DECnet address>

When an end system receives a packet, it examines three pieces of information: the intra-LAN bit, the source address, and the previous hop. If the intra-LAN bit is set, indicating that the packet has never left this wire (and, thus, the remote system is reachable without a router), a cache entry is created as follows:

<remote system DECnet address> = <source address>
<next hop DECnet address> = <source address>

If the intra-LAN bit is not set, indicating that the packet has come from another network, the cache entry is created as follows:

<remote system DECnet address> = <source address>
<next hop DECnet address> = <previous hop>

If there is no cache entry, then the designated router is used. This means that when starting a session, the designated router is used, but the reverse traffic will populate a cache entry so that the router can later communicate directly.

A DECnet IV Prime end node sends a packet to the Unknown Destination multicast if it has no cache entry for the destination and has no designated router.

Example

In the following example, DECnet priority for this router is set to 110 on Ethernet interface 1:

interface ethernet 1
decnet router-priority 110

decnet routing

To enable DECnet routing, use the decnet routing global configuration command. To disable DECnet routing, use the no form of this command.

decnet [network-number] routing [iv-prime] decnet-address
no decnet routing

Syntax Description
network-number (Optional) Network number in the range 0 to 3. Specified when using ATG. If not specified, the default is network 0.
iv-prime (Optional) Enables DECnet Phase IV Prime routing.
decnet-address Address in DECnet format X.Y, where X is the area number and Y is the node number.
Default

Disabled

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The decnet cost command is required for each interface on which DECnet routing is configured.

Enabling DECnet changes the MAC addresses of the router's interfaces. This is not a problem on routers equipped with nonvolatile memory. On systems that attempt to get their IP network addresses from network servers rather than from nonvolatile memory, there may be a problem as with the hardware addresses changing and confusing other IP-speaking hosts. This potential problem can be avoided by configuring and enabling DECnet before enabling other protocols.


Note You can configure up to four DECnet networks (numbered 0 to 3). To set up multiple DECnet networks, use the decnet global configuration commands with the appropriate network number and keywords. If the network number is omitted from the commands, network 0 is configured for DECnet routing.

DECnet Phase IV Prime eliminates the DEC addressing restrictions so that DECnet nodes can coexist with systems running other protocols that have other MAC address restrictions. If iv-prime is not specified, only Phase IV is enabled; configuring the MAC address will then make DECnet inoperable. The standard "AA-00-04-00" form will be set as the address of the interface on which DECnet is enabled. If Phase IV Prime was already running and this command is reissued without the iv-prime keyword (that is, going from Phase IV Prime to Phase IV), the command returns an error if any of the interfaces that have DECnet enabled have MAC addresses that are not compliant with DECnet Phase IV, requiring the user to evaluate conflicting interface commands.

The no form of this command disables Phase IV and Phase IV Prime routing.

Example

In the following example, DECnet routing is enabled for the router in area 21 with node number 456:

decnet routing 21.456
Related Commands

decnet cost
decnet node-type

decnet routing-timer

To specify how often the Cisco IOS software sends routing updates that list the hosts that the router can reach, use the decnet routing-timer interface configuration command. Use the no form of this command to disable the routing update timer.

decnet routing-timer seconds
no decnet routing-timer

Syntax Description
seconds Time, in seconds, from 1 to 65535. The default is 40 seconds.
Default

40 seconds

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Other routers use this information to construct local routing tables. In a network where changes occur infrequently or do not need to be responded to immediately (it is small and uncomplicated, applications are not particularly sensitive to delays or occasional packet loss, slow serial links, and so on), increasing the time between routing updates reduces the amount of unnecessary network traffic. Digital calls this argument the broadcast routing timer because they use a different timer for serial lines; Cisco's DECnet implementation does not make this distinction.

Example

In the following example, a serial interface is set to broadcast routing updates every 2 minutes (120 seconds):

interface serial 0
decnet routing-timer 120

decnet split-horizon

To use split horizon when sending routing updates, use the decnet split-horizon interface configuration command. To disable split horizon, use the no form of this command.

decnet split-horizon
no decnet split-horizon

Syntax Description

This command has no arguments or keywords.

Default

Enabled

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.2.

The decnet split-horizon command also affects whether broadcast packets received on an interface are resent on the same interface.

The decnet split-horizon command determines how much information is included in routing updates sent out an interface. It also determines whether received broadcasts are retransmitted on the same interface. When you enable split horizon, routing updates sent out on a given interface will not include any information that was originally learned from that interface, and broadcasts will not be retransmitted on the receiving interface. This is because split horizon is designed for networks that are either broadcast networks, or are fully connected mesh networks. In these types of networks, resending this information is a waste of network bandwidth because all other stations on that network have already heard the information. Disabling split horizon causes the Cisco IOS software to include all information in routing updates, and to resend broadcast packets on the network from which they were received.

You can use this command on any interface, but generally it makes sense to use it only for X.25 and Frame Relay interfaces. You should disable split horizon on X.25 and Frame Relay networks that are not fully connected mesh topologies.

Example

The following example disables split horizon on an X.25 network:

interface serial 0
 no decnet split-horizon

lat host-delay

To set the delayed acknowledgment for incoming LAT slave connections, use the lat host-delay global configuration command. To restore the default, use the no form of this command.

lat host-delay number
no lat host-delay

Syntax Description
number Delay in milliseconds.
Default

Disabled

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

Example

The following example sets the acknowledgment for incoming LAT slave connections to 100 ms:

lat host-delay 100

lat service autocommand

To associate a command with a service, use the lat service autocommand global configuration command. To remove the specified autocommand, use the no form of this command.

lat service service-name autocommand command
no lat service service-name autocommand command

Syntax Description
service-name Name of the service.
command Command to be associated with the service.
Default

No commands are automatically associated with a service.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

When an inbound connection is received for the specified service, the command associated with the service is automatically executed instead of the user receiving a virtual terminal session.

Authentication is bypassed for these services; only the LAT password is checked.


Note Do not use this option with the rotary keyword.
Example

The following example associates the command telnet readings to the service readings:

lat service readings autocommand telnet readings

ping (privileged)

To send DECnet echo packets to test the reachability of a remote host over a DECnet network, use the DECnet ping privileged EXEC command .

ping
Syntax Description

This command has no arguments or keywords.

Command Mode

Privileged EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

To abort a ping session, type the escape sequence (by default, Ctrl-^ X, which is done by simultaneously pressing the Ctrl, Shift, and 6 keys, letting go, then pressing the X key).

Table 21 describes the test characters that the ping facility sends.


Table  21:
Ping Test Characters (DECnet Privileged)
Character Description
! Each exclamation point indicates receipt of a reply.
. Each period indicates the network server timed out while waiting for a reply.
U A destination unreachable error Protocol Data Unit (PDU) was received.
C A congestion-experienced packet was received.
I User interrupted test.
? Unknown packet type.
& Packet lifetime exceeded.
Sample DECnet Display Using a DECnet Address

The following display shows a sample DECnet ping session that uses a DECnet address to specify the source:

router# ping
Protocol [ip]: decnet
Target DECnet address: 2.16
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Type escape sequence to abort.
Sending 5, 100-byte DECnet Echos to 2.16, 
timeout is 2 seconds:
!!!!!
Success rate is 100 percent, round-trip min/avg/max = 1/4/8 ms

Table 22 describes the fields shown in the display.


Table  22:
Ping Field Descriptions (DECnet)
Field Description
Protocol [ip]: Default is IP.
Target DECnet address: Prompts for the DECnet address of the destination node you plan to ping.
Repeat count [5]: Number of ping packets that are sent to the destination address. Default: 5.
Datagram size [100]: Size of the ping packet (in bytes). Default: 100 bytes.
Timeout in seconds [2]: Timeout interval (in seconds). Default: 2 seconds.
Related Command

ping decnet (user)

ping decnet (user)

To send DECnet echo packets to test the reachability of a remote host over a DECnet network, use the ping decnet user EXEC command .

ping decnet {host | address}
Syntax Description
decnet DECnet protocol keyword.
host DECnet host of system to ping.
address DECnet address of system to ping.
Command Mode

EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The ping EXEC command provides a basic user ping facility for DECnet users who do not have system privileges. This feature allows the Cisco IOS software to perform the simple default ping functionality for the DECnet protocol. Only the nonverbose form of the ping command is supported for user-level pings.

To abort a ping session, type the escape sequence (by default, Ctrl-^ X, which is done by simultaneously pressing the Ctrl, Shift, and 6 keys, letting go, then pressing the X key).

Table 23 describes the test characters that the ping facility sends.


Table  23:
Ping Test Characters (DECnet User)
Character Description
! Each exclamation point indicates receipt of a reply.
. Each period indicates the network server timed out while waiting for a reply.
U A destination unreachable error PDU was received.
C A congestion-experienced packet was received.
I User interrupted test.
? Unknown packet type.
& Packet lifetime exceeded.
Sample DECnet Display Using a DECnet Address

The following display shows sample ping output when you ping the DECnet address of 2.16:

router> ping decnet 2.16
Sending 5, 100-byte DECnet Echos to 2.16, 
timeout is 2 seconds:
!!!!!
Success rate is 100 percent, round-trip min/avg/max = 1/4/8 ms
Related Command

ping (privileged)

show decnet

To display the global DECnet parameters, use the show decnet privileged EXEC command.

show decnet
Syntax Description

This command has no arguments or keywords.

Command Mode

Privileged EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Sample Display

The following is sample output from the show decnet command:

router# show decnet
Global DECnet parameters for network 0:
   Local address is 19.15, node type is area (Phase-IV Prime)
   Level-2 'Attached' flag is FALSE, nearest level-2 router is 19.5
   Maximum node is 350, maximum area is 63, maximum visits is 63
   Maximum paths is 1, path split mode is normal
   Local maximum cost is 1022, maximum hops is 30
   Area maximum cost is 1022, maximum hops is 30
   Static routes *NOT* being sent in routing updates
   Default route configured; next hop address of 2.100

Table 24 describes significant fields shown in the display.


Table 24: Show DECnet Field Descriptions
Field Description
Global DECnet parameters for network 0: Indicates the DECnet network number of the network being described.
Local address is 19.15 DECnet address.
node type is area Indicates the DECnet node type with which the interface has been configured. Possible values include area (area router) or routing-iv (intra-area router).
Level-2 'Attached' flag is FALSE (DECnet Level-2 routers only) Indicates that this Level-2 router is not "attached" (can not reach other DECnet Phase IV areas). If the '"Attached" flag is TRUE, the router has reachability to other areas.

If the "Attached" flag is FALSE, other displays on this line are the following:

  • Nearest Level-2 router is NONE--(DECnet Level-1 routers only) Indicates that this Level-1 router has not heard from any eligible Level-2 router (to send out-of-area packets to)

  • Nearest Level-2 router is 1.200--(DECnet Level-1 routers only) Indicates that this router's nearest Level-2 router is 1.200. Any packets received by this router destined for other areas are sent to 1.200.

(Phase-IV Prime)

Indicates that the router is running DECnet Phase IV Prime routing.
Maximum node is 350 Highest node number that the router will recognize.
maximum area is 63 Indicates the maximum DECnet area number, which is used to control the size of internal routing tables and messages sent to other routers. Range: 1 to 63. Default: 63.
maximum visits is 63 Indicates the maximum number of times (visits) a packet can pass through a router. Range: 1 to 63. Default: 63.
Maximum paths is 1 Indicates the maximum number of equal-cost paths the router will save. Range: 1 to 31. Default: 1.
path split mode is normal Indicates how the router splits the routable packets among equal-cost paths. Possible values: normal (default) or interim.
Local maximum cost is 1022 For intra-area routes. Router ignores routes in its area that have a cost greater than this value.
maximum hops is 30 Indicates the maximum number of hops for a usable route within the local area. The router ignores routes within the local area that use more than this number of hops.
Area maximum cost is 1022 Indicates the maximum cost specification for interarea routing. The router ignores routes to other areas that have a cost greater than this value. Range: 1 to 1022: Default: 1022.
maximum hops is 30 Indicates the maximum number of hops for a usable route to other areas. The router ignores routes to other areas that use more than this number of hops.
Static routes *NOT* being sent in routing updates Indicates static routes are not included in routing updates.
Default route configured; next hop address of 2.100 Indicates a default route is configured on this router and shows the next hop address.

show decnet interface

To display the global DECnet status and configuration for all interfaces, or the status and configuration for a specified interface, use the show decnet interface EXEC command .

show decnet interface [type number]
Syntax Description
type (Optional) Interface type.
number (Optional) Interface number.
Command Mode

EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Sample Display

The following is sample output from the show decnet interface command:

router# show decnet interface
Global DECnet parameters for network 0:
  Local address is 19.15, node type is area
  Maximum node is 350, maximum area is 63, maximum visits is 63
  Maximum paths is 1, path split mode is normal
  Local maximum cost is 1022, maximum hops is 30
  Area maximum cost is 1022, maximum hops is 30
Ethernet 1 is up, line protocol is up, encapsulation is ARPA
  Interface cost is 4, priority is 64, DECnet network: 0
  The designated router is 1.9
  Sending HELLOs every 15 seconds, routing updates 40 seconds
  Smallest router blocksize seen is 1498 bytes
  Routing input list is not set, output list is not set
  Access list is not set
  DECnet fast switching is enabled
  Number of L1 router adjacencies is: 3
  Number of non-PhaseIV+ router adjacencies is: 3
  Number of PhaseIV+ router adjacencies is: 0
  Router is bilingual

Table 25 describes significant fields shown in the display.


Table 25: Show DECnet Interface Field Descriptions
when an Interface Is Not Specified
Field Description
Global DECnet parameters for network 0: Indicates the DECnet network number of the network being described.
Local address is 19.15 DECnet address of the router.
node type is area Indicates the DECnet node type with which the interface has been configured. Possible values include area (area router) or routing-iv (intra-area router).
Maximum node is 350 Highest node number that the router will recognize.
maximum area is 63 Indicates the maximum DECnet area number, which is used to control the size of internal routing tables and messages sent to other routers. Range: 1 to 63. Default: 63.
maximum visits is 63 Indicates the maximum number of times (visits) a packet can pass through a router. Range: 1 to 63. Default: 63.
Maximum paths is 1 Indicates the maximum number of equal-cost paths the router will save. Range: 1 to 31. Default: 1.
path split mode is normal Indicates how the router splits the routable packets among equal-cost paths. Possible values: normal (default) or interim.
Local maximum cost is 1022 For intra-area routes. Router ignores routes in its area that have a cost greater than this value.
maximum hops is 30 Indicates the maximum number of hops for a usable route within the local area. The router ignores routes within the local area that use more than this number of hops.
Area maximum cost is 1022 Indicates the maximum cost specification for interarea routing. The router ignores routes to other areas that have a cost greater than this value. Range: 1 to 1022: Default: 1022.
maximum hops is 30 Indicates the maximum number of hops for a usable route to other areas. The router ignores routes to other areas that use more than this number of hops.
Ethernet 0 is up Indicates whether the interface hardware is currently active and if it has been taken down by an administrator.
line protocol is up Indicates whether the software processes that handle the line protocol believe the interface is usable (that is, whether keepalives are successful).
encapsulation is ARPA Indicates the encapsulation type.
Interface cost is 4 Indicates the cost that has been assigned to this interface using the decnet cost interface configuration command. If there are multiple paths to a destination, the one with the lowest cost is selected.
priority is 64 Indicates the priority that has been assigned to this router on this interface. End systems select the router with the highest priority as their designated router.
DECnet network: 0 Indicates that this interface is on DECnet network 0. This fact is significant only if ATG is turned on.
The designated router is 1.3 Indicates the designated router on this particular LAN.
Sending HELLOs every 15 seconds Indicates the frequency of hello packets.
routing updates 40 seconds Indicates the frequency of routing updates.
Smallest router blocksize seen is 1498 bytes Indicates the largest size of packets being sent on all routers on the LAN.
Routing input list is not set, output list is not set Indicates that no access restrictions on incoming (or outgoing) router update or hello messages have been set for this interface.
Access list is not set Indicates that no access lists have been configured for the interface.
DECnet fast switching is enabled Indicates that fast switching is enabled.
Number of L1 router adjacencies is : 1 Indicates how many Level 1 adjacencies the router has on this interface.
Number of non-PhaseIV+ router adjacencies is: 3 Number of L1 and L2 routers on this interface that are not running Phase IV+.
Number of PhaseIV+ router adjacencies is: 0 Number of L2 routers on this interface that are running Phase IV+.
Router is bilingual The router's MAC address on this interface is Phase IV-compatible (that is, it takes the form AA-00-04-00-xx-yy or 55-00-20-00-aa-bb on interfaces where the address is bit swapped). This means that the router behaves as both a Phase IV and a Phase IV Prime router.
Sample Display

The following is sample output from the show decnet interface command when you specify an interface:

router# show decnet interface ethernet 0
Ethernet0 is up, line protocol is up, encapsulation is ARPA
  Interface cost is 4, priority is 64, DECnet network: 0
  The designated router is 1.3
  Sending HELLOs every 15 seconds, routing updates 40 seconds
  Smallest router blocksize seen is 1498 bytes
  Routing input list is not set, output list is not set
  Access list is not set
  DECnet fast switching is enabled
  Number of L1 router adjacencies is: 1
  Number of non-PhaseIV+ router adjacencies is: 3
  Number of PhaseIV+ router adjacencies is: 0
  Router is bilingual

Table 26 describes significant fields shown in the display.


Table 26: Show DECnet Interface Field Descriptions
when an Interface Is Specified
Field Description
Ethernet 0 is up Indicates whether the interface hardware is currently active and if it has been taken down by an administrator.
line protocol is up Indicates whether the software processes that handle the line protocol believe the interface is usable (that is, whether keepalives are successful).
encapsulation is ARPA Indicates the encapsulation type.
Interface cost is 4 Indicates the cost that has been assigned to this interface using the decnet cost interface configuration command. If there are multiple paths to a destination, the one with the lowest cost is selected.
priority is 64 Indicates the priority that has been assigned to this router on this interface. End systems select the router with the highest priority as their designated router.
DECnet network: 0 Indicates that this interface is on DECnet network 0. This fact is significant only if ATG is turned on.
The designated router is 1.3 Indicates the designated router on this particular LAN.
Sending HELLOs every 15 seconds Indicates the frequency of hello packets.
routing updates 40 seconds Indicates the frequency of routing updates.
Smallest router blocksize seen is 1498 bytes Indicates the largest size of packets being sent on all routers on the LAN.
Routing input list is not set, output list is not set Indicates that no access restrictions on incoming (or outgoing) router update or hello messages have been set for this interface.
Access list is not set Indicates that no access lists have been configured for the interface.
DECnet fast switching is enabled Indicates that fast switching is enabled.
Number of L1 router adjacencies is : 1 Indicates how many Level 1 adjacencies the router has on this interface.
Number of non-PhaseIV+ router adjacencies is: 3 Number of L1 and L2 routers on this interface that are not running Phase IV+.
Number of PhaseIV+ router adjacencies is: 0 Number of L2 routers on this interface that are running Phase IV+.
Router is bilingual The router's MAC address on this interface is Phase IV-compatible (that is, it takes the form AA-00-04-00-xx-yy or 55-00-20-00-aa-bb on interfaces where the address is bit swapped). This means that the router behaves as both a Phase IV and a Phase IV Prime router.

show decnet map

To display the address mapping information used by the DECnet Address Translation Gateway, use the show decnet map EXEC command .

show decnet map
Syntax Description

This command has no arguments or keywords.

Command Mode

EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Sample Display

The following is sample output from the show decnet map command:

router# show decnet map
Net Node   -> Net Node    Uses     Cost Hops
  0 1.100       1 2.100   0

Table 27 describes significant fields shown in the display.


Table  27: Show DECnet Map Field Descriptions
Field Description
Net Node -> Net Node Network number and node address.
Uses Number of times this map was used.
Cost Cost associated with the route.
Hops Number of hops to destination mode.

show decnet neighbors

To display all Phase IV and Phase IV Prime adjacencies and the MAC address associated with each neighbor, use the show decnet neighbors privileged EXEC command .

show decnet neighbors
Syntax Description

This command has no arguments or keywords.

Command Mode

Privileged EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Sample Display

The following is sample output from the show decnet neighbors command:

router# show decnet neighbors

Net Node     Interface      MAC address     Flags
0   3.11     Ethernet0    aa00.0400.0b0c  A
0   1.1      Ethernet0    aa00.0400.0104  V
0   1.3      Ethernet1    aa00.0400.0304  V
0   1.6      Ethernet1    aa00.0400.0604  V
0   2.2      TokenRing    5500.2000.4020  V IV-PRIME

Table 28 describes the fields shown in the display.


Table  28: Show DECnet Neighbors Field Descriptions
Field Description
Net Number of the DECnet network this adjacency is in.
Node DECnet address of the adjacency.
Interface Interface over which this adjacency was heard.
MAC address MAC address that this adjacency is using on this interface.
Flags A: L2 adjacency.
V: L1 adjacency.
IV-PRIME: DECnet Phase IV Prime adjacency.

show decnet route

To display the DECnet routing table, use the show decnet route EXEC command .

show decnet route [decnet-address]
Syntax Description
decnet-address (Optional) DECnet address and, when specified, the first hop route to that address is displayed.
Command Mode

EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Sample Display

The following is sample output from the show decnet route command when a DECnet address name was not specified, so the entire routing table is displayed:

router# show decnet route

  Area       Cost  Hops   Next Hop to Node       Expires  Prio

 1             4     1   Ethernet1 -> 1.300         26     64    A
*1             4     1   Ethernet1 -> 1.400         37     64    A
*2             8     2   Ethernet1 -> 1.400
*5             0     0     (Local) -> 5.5
*10            4     1   Ethernet2 -> 10.1          36     64    A
*13           11     3   Ethernet1 -> 1.400
*44           22     6   Ethernet1 -> 1.400
*51           18     4   Ethernet1 -> 1.400
*61            1     1       (OSI) -> 5.5
*62            1     1       (OSI) -> 5.5
*3             0     0    (STATIC)   Ethernet0, snpa aa00.0400.0404
*4             0     0    (STATIC)   Serial0
*6             5     4    (STATIC)   forwarding to 2.3

  Node       Cost  Hops   Next Hop to Node       Expires  Prio

*(Area)        0     0     (Local) -> 5.5
*5.5           0     0     (Local) -> 5.5          32     64     A+

*DEFAULT*:    0     0     using next hop address of 2.100

As the display shows, the show decnet route command can display more than one route for a destination when equal-cost paths have been set with the decnet max-paths global configuration command, and when there is more than one equal-cost path to a destination. The display also shows that this node is an area router.

Table 29 describes significant fields shown in the display.


Table  29: Show DECnet Route Field Descriptions
Field Description
* Currently selected route for a particular destination. In interim mode, the selected route will never appear to change.
Node DECnet address of this (reachable) destination.
(Area) All Level 1 routes are displayed in this section except for this the first entry, which points to the nearest Level 2 router.
Cost Assigned cost for the interface, based on a recommended value for the underlying media. Range: 1 to 63. No default.
Hops Number of hops to this node from the router being monitored.
Next Hop to Node DECnet address of the next hop a packet will take to get to the final destination as well as the interface.
(Local) The address that the router is configured with.
(OSI) Indicates that this entry was created by the decnet advertise command.
(STATIC) Indicates that this entry was created by the decnet route command.
Expires Displays how many seconds from now this entry expires.
Prio Router priority of this node.
  V Adjacent Level 1 router.
  A+ Adjacent Level 2 (area) router; A indicates that this is an adjacency created from a Phase IV hello, A+ indicates that this is an adjacency created from a Phase IV+ hello.

show decnet static

To display all statically configured DECnet routes, use the show decnet static privileged EXEC command.

show decnet static
Syntax Description

This command has no arguments or keywords.

Command Mode

Privileged EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 11.1.

All static routes are stored in a static route queue, which allows static routes to be reinstated when DECnet routing is turned off then on again.

Not all routes in the static route queue will show up in the routing table. This happens under the following conditions:

decnet route 2.0 1.2
decnet route 3.10 1.200
decnet route 1.1 1.200
decnet route 4.1 10.200
A static route appears because a Level 2 route is installed to area 4.
decnet route 4.0 10.200
decnet route 2.0 10.200
decnet route 2.1 5.4 s 1
Sample Display

The following is sample output from the show decnet static command:

router# show decnet static
Address      Cost     Hops    Next hop          SNPA
 3             0       0      Ethernet0  aa00.0400.0404
 5             0       0      Serial0
 5.100         0       0      Serial2
 DEFAULT       0       0        2.100
 6             5       4        2.3

Note that this router is a Level 2 router with DECnet address of 1.2, so a static route configured for 5.100 is not relevant here. This route appears in the show decnet static display, but not in the routing table.

show decnet traffic

To show the DECnet traffic statistics (including datagrams sent, received, and forwarded), use the show decnet traffic EXEC command .

show decnet traffic
Syntax Description

This command has no arguments or keywords.

Command Mode

EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Sample Display

The following is sample output from the show decnet traffic command:

router# show decnet traffic
Total: 42 received, 0 format errors, 0 unimplemented
0 not a gateway, 0 no memory, 0 no routing vector
0 non-empty queue encountered
Hellos: 21 received, 0 bad, 0 other area, 16 sent
Level 1 routing: 14 received, 0 bad, 0 other area, 16 sent
Level 2 routing: 7 received, 0 not primary router, 8 sent
Data: 0 received, 0 not long format, 0 too many visits
0 forwarded, 0 returned, 0 converted, 0 local destination
0 access control failed, 0 no route, 0 encapsulation failed
0 inactive network, 0 incomplete map

Table 30 describes the fields shown in the display.


Table 30: Show DECnet Traffic Field Descriptions
Field Description
Total: Displays the totals of packet types received.
  received Total of all types of DECnet packets received.
  format errors Lists the number of packets that appeared to be DECnet, but were formatted incorrectly. The number in the received field includes these packets.
  0 unimplemented Reports the number of incoming packets that are DECnet control packets, and how many specify a service that the router does not implement. This includes services implemented to forward Level 1 and Level 2 routing information, and router and end-system hello packets.
  0 not a gateway Reports the total number of packets received while not routing DECnet.
  0 no memory Records transaction attempts when the system has run out of memory.
  0 no routing vector Indicates that either a routing update came in from another router when the router did not have an adjacency for it, or it had no routing vector for the type of routing update. Use the debug decnet-routing EXEC command for more information.
0 non-empty queue encountered Number of times the DECnet output process encountered a non-empty interface output queue.
HELLOs: Displays the number of hello messages received and sent.
  received Displays the total number of hello messages received. All protocol types are included.
  bad Displays the total number of "bad" hello messages received. Invoke the EXEC command debug decnet to display more information about why the hello message was judged as bad.
  other area Displays the total number of hello messages received from nodes on other areas when the router is a Level 1 router only.
  sent Displays the total number of hello messages sent.
Level 1 routing: Displays the Level 1 routing updates received and sent.
  received Displays the total number of Level 1 routing updates received.
  bad Displays the total number of Level 1 updates received that were judged to be bad.
  other area Displays the total number of Level 1 updates from nodes in other areas.
  sent Displays the total number of Level 1 updates sent.
Level 2 routing: Displays the Level 2 routing updates received and sent.
  received Displays the total number of Level 2 updates received.
  not primary router Should always be zero.
  sent Displays the total number of Level 2 updates sent.
Data: Displays the number of data packets received and sent.
  received Displays the total number of noncontrol (data) packets received.
  not long format Displays the number of packets received which are not in the long DECnet format. This number should always be zero. If it is not, investigate the source of the improperly formatted packets.
  too many visits Lists the number of packets received which have visited too many routers and have been flushed.
  forwarded Lists the total number of packets forwarded.
   returned Lists the total number of packets returned to the sender at the senders' request.
  converted Displays the number of Phase IV packets converted to Phase V packets.
  local destination Packets received that are destined for this router.
  access control failed Lists the packets dropped because access control required it.
  no route Lists the total packets dropped because the router did not know where to forward them.
  encapsulation failed Lists the number of packets that could not be encapsulated. This usually happens where there are entries missing in a map for a public data network, such as X.25 or Frame Relay. This can also occur if an interface is set for an encapsulation for which there is no defined DECnet encapsulation, such as Point-to-Point Protocol (PPP) on serial interfaces).
  inactive network Displays the number of packets that appear to come from a known interface, or that ATG returned because they did not make sense.
  incomplete map Counts the number of packets that failed address translation. This usually means a node that is not in the ATG map is trying to access a node in another network advertised by the ATG.

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