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Peer-to-Peer DDR with Dialer Profiles Commands

Peer-to-Peer DDR with Dialer Profiles Commands

This chapter lists commands for the Dialer Profiles implementation of dial-on-demand routing (DDR), explains the command syntax, and provides usage guidelines. For information about configuring Dialer Profiles DDR and for configuration examples, refer to the "Configuring Peer-to-Peer DDR with Dialer Profiles" chapter in the Dial Solutions Configuration Guide.

dialer fast-idle (map-class dialer configuration)

To specify the fast idle timer value to use when placing a call to any telephone number associated with a specified class, use the dialer fast-idle map-class dialer configuration command. To reset the dialer fast-idle timer to the default, use the no form of this command.

dialer fast-idle seconds
no dialer fast-idle

Syntax Description

seconds

Number of seconds to wait before placing a different call.

Default

Defaults to the fast idle timer value set for the interface.

Command Mode

Map-class dialer

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

The dialer string class command defines the map class associated with the dial string and interface.

This fast idle timer is associated only with the map class, not the entire interface.

Example

The following example specifies a dialer fast idle time of 10 seconds:

dialer string 4156884540 class Eng
! This map-class ensures that these calls use an ISDN speed of 56 kbps and a
! fast-idle time of 10 seconds.
map-class dialer Eng
 isdn speed 56
 dialer fast-idle 10
 dialer wait-for-carrier-time 30

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer fast-idle (interface)
dialer string (dialer profiles)
map-class dialer

dialer-group

To control access by configuring an interface to belong to a specific dialing group, use the dialer-group interface configuration command. To remove an interface from the specified dialer access group, use the no form of this command.

dialer-group group-number
no dialer-group

Syntax Description

group-number

Number of the dialer access group to which the specific interface belongs. This access group is defined with the dialer-list command. Acceptable values are nonzero, positive integers between 1 and 10.

Default

No access is predefined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

An interface can be associated with a single dialer access group only; multiple dialer-group assignment is not allowed. A second dialer access group assignment will override the first. A dialer access group is defined with the dialer-group command. The dialer-list command associates an access list with a dialer access group.

Packets that match the dialer group specified trigger a connection request.

Example

The following example specifies dialer access group number 1.

The destination address of the packet is evaluated against the access list specified in the associated dialer-list command. If it passes, either a call is initiated (if no connection has already been established) or the idle timer is reset (if a call is currently connected).

interface async 1
 dialer-group 1
access-list 101 deny igrp 0.0.0.0 255.255.255.255 255.255.255.255 0.0.0.0 
access-list 101 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 
dialer-list 1 list 101

dialer idle-timeout (map-class dialer configuration)

To specify the idle time before the calls in this map class are disconnected, use the dialer idle-timeout map-class dialer configuration command. To reset the idle timeout to the default, use the no form of this command.

dialer idle-timeout seconds
no dialer idle-timeout

Syntax Description

seconds

Idle time, in seconds, that must occur on an interface associated with a map class before calls are disconnected. Acceptable values are positive, nonzero integers.

Default

Defaults to a value set for the interface.

Command Mode

Map-class configuration

Usage Guidelines

The dialer string class command defines the map class associated with the dial string and interface.

Example

The following example sets a dialer idle-timeout interval of 180 seconds:

dialer idle-timeout 180

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer string (dialer profiles)

dialer isdn

To specify the bit rate used on the B channel associated with a specified map class and to specify whether to set up semipermanent connections for this map class, use the dialer isdn map-class configuration command.

dialer isdn [speed speed] [spc]
no dialer isdn [speed speed] [spc]

Syntax Description

speed speed

(Optional) Bit rate, in kilobytes per second (kbps), used on the ISDN B channel. Values are 56 and 64. Default is 64.

spc

(Optional) Specifies that an ISDN semipermanent connection is to be used for calls associated with this map class.

Default

Bit rate is 64 Kbps. Semipermanent connections are not set up.

Command Mode

Map-class dialer configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2.

This command is valid for ISDN interfaces only.

Example

The following example configures a speed of 56 kbps and no semipermanent connections for the Eng map class:

dialer string 4156884540 class Eng 
! This map-class ensures that these calls use an ISDN speed of 56 kbps and that 
! no semipermanent connection is set up.
map-class dialer Eng
dialer isdn speed 56 

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer string (dialer profiles)

dialer-list protocol

To define a DDR dialer list to control dialing by protocol or by a combination of protocol and access list, use the dialer-list protocol global configuration command. To delete a dialer list, use the no form of this command.

dialer-list dialer-group protocol protocol-name {permit | deny | list access-list-number |
access-group}
no dialer-list dialer-group [protocol protocol-name [list access-list-number | access-group]]

Syntax Description

dialer-group

Number of a dialer access group identified in any dialer-group interface configuration command.

protocol-name

One of the following protocol keywords: appletalk, bridge, clns, clns_es, clns_is, decnet, decnet_router-L1, decnet_router-L2, decnet_node, ip, ipx, vines, or xns.

permit

Permits access to an entire protocol.

deny

Denies access to an entire protocol.

list

Specifies that an access list will be used for defining a granularity finer than an entire protocol.

access-list-number

Access list numbers specified in any DECnet, Banyan
VINES, IP, Novell IPX, or XNS standard or extended access lists, including Novell IPX extended service access point (SAP) access lists and bridging types. See Table 125 for the supported access list types and numbers.

access-group

Filter list name used in the clns filter-set and clns access-group commands.

Default

No dialer lists are defined.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0. The list keyword and access-list-number and access-group arguments first appeared in Cisco IOS Release 10.3.

The various no forms of this command have the following effects:

The dialer-list protocol form of this command permits or denies access to an entire protocol. The dialer-list protocol list form of this command provides a finer permission granularity and also supports protocols that were not previously supported.

The dialer-list protocol list form of this command applies protocol access lists to dialer access groups to control dialing using DDR. The dialer access groups are defined with the dialer-group command.

Although the dialer-list list command is still supported for IP, IPX, DECnet, AppleTalk, XNS, and bridging, the new dialer-list protocol list command should be used for all protocols. The dialer-list protocol list command is supported for all those protocols and also for Banyan VINES and International Organization for Standardization (ISO) Connectionless Network Service (CLNS).

Table 125 lists the access list types and numbers that the dialer-list protocol list command supports. The table does not include ISO CLNS because that protocol uses filter names instead of predefined access list numbers.


Table 125:
Access List Type Access List Number Range (decimal)

AppleTalk

600-699

Banyan VINES (standard)

1-100

Banyan VINES (extended)

101-200

DECnet

300-399

IP (standard)

1-99

IP (extended)

100-199

Novell IPX (standard)

800-899

Novell IPX (extended)

900-999

Transparent Bridging

200-299

XNS

500-599

Dialer-List Supported
Access List Types and Numbers

Examples

Dialing occurs when an interesting packet (one that matches access list specifications) needs to be output on an interface. Using the standard access list method, packets can be classified as interesting or uninteresting. In the following example, IGRP TCP/IP routing protocol updates are not classified as interesting and do not initiate calls:

access-list 101 deny igrp 0.0.0.0 255.255.255.255 255.255.255.255 0.0.0.0

The following example classifies all other IP packets as interesting and permits them to initiate calls:

access-list 101 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255

Then the following command places list 101 into dialer access group 1:

dialer-list 1 protocol ip list 101

In the following example, DECnet access lists allow any DECnet packets with source area 10 and destination area 20 to trigger calls:

access-list 301 permit 10.0 0.1023 10.0 0.1023
access-list 301 permit 10.0 0.1023 20.0 0.1023

Then the following command places list 301 into dialer access group 1:

dialer-list 1 protocol decnet list 301

The following example defines both IP and VINES access lists. The IP access lists define IGRP packets as uninteresting, but permits all other IP packets to trigger calls. The VINES access lists do not allow Routing Table Protocol (RTP) routing updates to trigger calls, but allow any other data packets to trigger calls.

access-list 101 deny igrp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
access-list 101 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
!
vines access-list 107 deny RTP 00000000:0000 FFFFFFFF:FFFF 00000000:0000 FFFFFFFF:FFFF
vines access-list 107 permit IP 00000000:0000 FFFFFFFF:FFFF 00000000:0000 FFFFFFFF:FFFF

The following two commands place the IP and VINES access lists into dialer access group 1:

dialer-list 1 protocol ip list 101
dialer-list 1 protocol vines list 107

The following example defines a Connectionless Network Service (CLNS) filter, and then the filter is placed in dialer access group  1:

clns filter-set ddrline permit 47.0004.0001....
!
dialer-list 1 protocol clns list ddrline

Related Commands

You can use the master indexes or search online to find documentation of related commands.

access-list
clns filter-set
dialer-group
vines access-list

dialer max-link

To specify, for a dialer profile, the maximum number of links to a remote destination that can be up at any one time, use the dialer max-link interface configuration command.

dialer max-link number

Syntax Description

number

Maximum number of links, in the range 1 through 255. Default is 255 links.

Default

255 links

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2.

This command applies to dialer interfaces only.

This command is used mainly to set the maximum number of links below the maximum possible.

Example

The following example sets a maximum of six links:

dialer max-link 6 

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer isdn
dialer string (dialer profiles)

dialer pool

To specify, for a dialer interface, which dialing pool to use to connect to a specific destination subnetwork, use the dialer pool interface configuration command.

dialer pool number

Syntax Description

number

Dialing pool number, in the range 1 through 255.

Default

Disabled. No default number is specified.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2.

This command applies to dialer interfaces only.

Examples

The following example shows a dialer interface configuration that is linked to the physical interface configuration shown for BRI 1 in the dialer pool-member command section. Dialer interface 1 uses dialer pool 3, of which BRI 1 is a member.

! This is a dialer profile for reaching remote subnetwork 1.1.1.1.
interface Dialer1
 ip address 1.1.1.1 255.255.255.0
 encapsulation ppp
 dialer remote-name Smalluser
 dialer string 4540
 dialer pool 3
 dialer-group 1

The following example might accompany the previous dialer profile configuration example. Physical interface BRI 1 has a reserved channel in dialer pool 3. That channel is inactive until BRI 1 uses it to place calls.

interface BRI1
 encapsulation ppp
 dialer pool-member 1 priority 50
 dialer pool-member 2 priority 50
!BRI 1 has a reserved channel in dialer pool 3; the channel remains inactive
!until BRI 1 uses it to place calls.
 dialer pool-member 3 min-link 1
 ppp authentication chap

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer pool-member
dialer remote-name

dialer pool-member

To configure a physical interface to be a member of a Dialer Profiles dialing pool, use the dialer pool-member interface configuration command.

dialer pool-member number [priority priority] [min-link minimum] [max-link maximum]

Syntax Description

number

Dialing pool number, in the range 1 through 255.

priority priority

(Optional) Priority of this interface within the dialing pool, in the range 0 (lowest) to 255 (highest). Interfaces with the highest priority are selected first for dialing out. Default is 0.

min-link minimum

(Optional) Minimum number of B channels on this interface that are reserved for this dialing pool, in the range 0 to 255. Default is 0. A reserved channel is inactive until the specified interface uses it to place calls. Applies to ISDN interfaces only.

max-link maximum

(Optional) Maximum number of B channels on this interface that can be used by this dialing pool, in the range 0 to 255. Default is 255. Applies to ISDN interfaces only.

Defaults

Disabled. When enabled, no default dialing pool number is assigned; the default value of priority, and minimum is 0; the default value of maximum is 255.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2.

This command applies to asynchronous serial, synchronous serial, BRI, and PRI physical interfaces only. It does not apply to dialer interfaces.

The common number used in the dialer pool command and in the dialer pool-member command links the physical interface and dialer interface configurations together.

The min-link keyword and value are used primarily for dial backup.

Examples

This following example shows the configuration of one ISDN BRI interface to be a member of dialer pool 2 with priority 100:

interface BRI2
 encapsulation ppp
 dialer pool-member 2 priority 100
 ppp authentication chap

In the following example, BRI physical interface configuration BRI 1 has a reserved channel in dialer pool 3. That channel is inactive until BRI 1 uses it to place calls.

interface BRI1
 encapsulation ppp
 dialer pool-member 1 priority 50
 dialer pool-member 2 priority 50
!BRI 1 has a reserved channel in dialer pool 3; the channel remains inactive
!until BRI 1 uses it to place calls.
 dialer pool-member 3 min-link 1
 ppp authentication chap

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer pool

dialer remote-name

To specify, for a dialer interface, the authentication name of the remote router on the destination subnetwork, use the dialer remote-name interface configuration command.

dialer remote-name username

Syntax Description

username

Case-sensitive character string identifying the remote device; maximum length is 255 characters.

Default

Disabled. No default username is specified.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2.

This command applies only to dialer interfaces.

When using CHAP or PAP authentication, username is the name of the remote device that is authenticating.

Example

The following partial example sets the name of the remote host to dallas.

dialer remote-name dallas

Related Commands

You can use the master indexes or search online to find documentation of related commands.

ppp authentication chap
ppp authentication pap

dialer string (dialer profiles)

To specify the string (telephone number) to be used when placing a call from an interface, use the dialer string interface configuration command. To delete the telephone number specified for the interface, use the no form of this command.

dialer string dial-string [class class-name]
no dialer string

Syntax Description

dial-string

Telephone number to be sent to a DCE device.

class class-name

(Optional) Dialer map class associated with this telephone number.

Default

No telephone numbers and class names are predefined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2.

When you use Dialer Profiles for DDR, use the dialer string class form of this command to define a map class for a specific dialer profile.

Dialer Profiles make it unnecessary to use dialer maps to configure DDR.


Note If a dialer string command is specified without a dialer-group command with access lists defined, dialing is never initiated. If the debug dialer command is enabled, an error message is displayed indicating that dialing never will occur.

Example

The following example specifies that the dial string 4159991234 be used in calls to destinations defined by the map class sf:

dialer string 4159991234 class sf

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer remote-name
interface dialer

dialer wait-for-carrier-time (map-class dialer configuration)

To specify the length of time to wait for a carrier when dialing out to the dial string associated with a specified map class, use the dialer wait-for-carrier-time map-class dialer configuration command. To reset the carrier wait time value to the default, use the no form of this command.

dialer wait-for-carrier-time seconds
no dialer wait-for-carrier-time

Syntax Description

seconds

Number of seconds that the interface waits for the carrier to come up when a call is placed. Acceptable values are positive, nonzero integers. The default is 30 seconds.

Default

30 seconds

Command Mode

Map-class dialer configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

You can define different dialer map classes with different wait-for-carrier times to suit the different types of lines and interfaces. For example, you must define a longer wait time for a map class used by serial interfaces than for one used by ISDN interfaces.

Example

The following example specifies a carrier wait time of 20 seconds for the Eng class on the Dialer2 interface:

interface Dialer2
 ip address 2.2.2.2 255.255.255.0
 encapsulation ppp
 dialer remote-name Mediumuser
 dialer string 5264540 class Eng
 dialer wait-for-carrier-time 20
 dialer load-threshold 50 either
 dialer pool 1
 dialer-group 2

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer string (dialer profiles)

interface dialer

To define a dialer rotary group, use the interface dialer global configuration command.

interface dialer number

Syntax Description

number

Number of the dialer rotary group. It can be number in the range 0 through 255.

Default

No dialer rotary groups are predefined.

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Dialer rotary groups allow you to apply a single interface configuration to a set of physical interfaces. This allows a group of interfaces to be used as a pool of interfaces for calling many destinations.

Once the interface configuration is propagated to a set of interfaces, those interfaces can be used to place calls using the standard DDR criteria. When multiple destinations are configured, any of these interfaces can be used for outgoing calls.

Dialer rotary groups are useful in environments that require multiple calling destinations. Only the rotary group needs to be configured with the dialer map commands. The only configuration required for the interfaces is the dialer rotary-group command indicating that each interface is part of a dialer rotary group.

Although a dialer rotary group is configured as an interface, it is not a physical interface. Instead, it represents a group of interfaces. Interface configuration commands entered after the interface dialer command will be applied to all physical interfaces assigned to specified rotary groups. Individual interfaces in a dialer rotary group do not have individual addresses. The dialer interface has a protocol address, and that address is used by all interfaces in the dialer rotary group.

Example

The following example identifies interface dialer 1 as the dialer rotary group leader. Interface dialer  1 is not a physical interface, but represents a group of interfaces. The interface configuration commands that follow apply to all interfaces included in this group.

interface dialer 1
 encapsulation ppp
 authentication chap
 dialer in-band
 ip address 1.2.3.4
 dialer map ip 1.2.2.5 name YYY 14155553434
 dialer map ip 1.3.2.6 name ZZZ

map-class dialer

To define a class of shared configuration parameters associated with the dialer map command, use the map-class dialer global configuration command.

map-class dialer classname

Syntax Description

classname

Unique class identifier.

Default

Disabled; no class name is provided.

Command Mode

Global configuration

Usage Guidelines

The classname must be the same as the classname in the dialer map command.

Example

The following example configures a map class called "hawaii" and sets an ISDN speed of 56 kbps for the class.

map-class dialer hawaii
 isdn speed 56

Related Commands

You can use the master indexes or search online to find documentation of related commands.

dialer map

show dialer

To display general diagnostic information for interfaces configured for DDR, use the show dialer EXEC command.

show dialer [interface type number]

Syntax Description

interface

(Optional) Displays information for the interface specified by the arguments type and number.

type

(Optional) Interface type.

number

(Optional) Interface number.

Command Mode

EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

Sample Displays

If you enter the show dialer interface command for the D channel of an ISDN BRI or PRI, the command output also displays the B channels. That is, the command show dialer interface bri 0 displays information of interfaces bri 0, bri 0:1, and bri 0:2. The command show dialer interface serial 0:23 (for a channelized T1 line configured for ISDN PRI) displays information for serial interfaces 0:23, 0:0, 0:1, and so forth to 0:22.

If you have defined a dialer group that consists of the interfaces serial 0, serial 1, and bri 2, the command show dialer interface dialer 1 displays information for interfaces bri 0, bri 0:1, bri 0:2, serial 1, and serial  0.

The following is sample output from the show dialer command for a BRI interface when dialer profiles are configured:

impulse# show dialer interface bri 0
BRI0 - dialer type = ISDN
Dial String      Successes   Failures    Last called   Last status
0 incoming call(s) have been screened.
BRI0: B-Channel 1
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Dial reason: ip (s=6.1.1.8, d=6.1.1.1)
Interface bound to profile Dialer0
Time until disconnect 102 secs
Current call connected 00:00:19
Connected to 5773872 (wolfman)
BRI0: B-Channel 2
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is idle

Table 126 describes significant fields shown in the display.


Table 126: Show Dialer Interface BRI Field Descriptions
Field Description

BRI0 - dialer type = ISDN

ISDN dialer.

Dial String

Dial strings of logged calls (telephone numbers). On ISDN BRI interfaces, if you have specified a subaddress number in the dialer string, this number is included in the dial string after a colon.

Successes

Successful connections (even if no data is passed).

Failures

Failed connections; call not successfully completed.

Last called

Time that last call occurred to specific dial string.

Last status

Status of last call to specific dial string (successful or failed).

0 incoming call(s) have been screened.

Number of calls subjected to Dialer Profiles screening to determine how the call is to be treated.

BRI0: B-Channel 1

Header indicating the following data is for B  channel  1.

Idle timer (120 secs), Fast idle timer (20 secs)

Settings (in seconds)for the idle timer and the fast idle timer.

Wait for carrier (30 secs), Re-enable (15 secs)

Settings (in seconds)for the wait for carrier timer and the reenable timer.

Dialer state is data link layer up

The message "data link layer up" suggests that the dialer came up properly; if it says anything else then dialer did not come up properly. The message "physical layer up" means the line protocol (LCP) came up, but the NCP did not come up. The show interfaces command also provides the similar information.

Dial reason: ip (s=6.1.1.8, d=6.1.1.1)

What initiated the dial, namely an IP packet, plus source and destination address in the packet.

Interface bound to profile Dialer0

Dialer profile that is bound to this interface or B  channel.

Time until disconnect

Time until line is configured to disconnect.

Current call connected

Time at which the current call was connected.

Connected to

Dial string to which line is currently connected.

The following is sample output from the show dialer command for an asynchronous interface:

Router# show dialer interface async 1
Async1 - dialer type = IN-BAND NO-PARITY
Idle timer (900 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Time until disconnect 838 secs
Current call connected 0:02:16
Connected to 8986
 
 Dial String      Successes   Failures    Last called   Last status
 8986                   0         0        never                     Default
 8986                   8         3        0:02:16      Success      Default

Table 127 describes significant fields shown in the display.


Table 127: Show Dialer Interface Async Field Descriptions for In-Band Dialers
Field Description

Async 1

Name of an asynchronous interface.

dialer type = IN-BAND

Indicates that DDR is enabled.

Idle timer (900 secs)

Idle timeout specification (in seconds).

Fast idle timer (20 secs)

Fast idle timer specification (in seconds).

Wait for carrier (30 secs)

Wait for carrier timer specification (in seconds).

Re-enable (15 secs)

Enable timeout specification (in seconds).

Time until disconnected

Time until line is configured to disconnect.

Current call connected

Time at which the current call was connected.

Connected to

Dial string to which line is currently connected.

Dial String

Dial strings of logged calls (telephone numbers). On ISDN BRI interfaces, if you have specified a subaddress number in the dialer string or dialer map command, this number is included in the dial string after a colon.

Successes

Successful connections (even if no data is passed).

Failures

Failed connections; call not successfully completed.

Last called

Time that last call occurred to specific dial string.

Last status

Status of last call to specific dial string (successful or failed).

Default

If the DDR facility is using the dial string specified with the dialer string command, the word Default is appended to the Last status entry.

When the show dialer EXEC command is issued for a synchronous serial interface configured for DTR dialing, output similar to the following is displayed:

Serial 0 - dialer type = DTR SYNC
Idle timer (120 secs), Fst idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
 Dial String   Successes   Failures    Last called   Last status
 ----                1         0        1:04:47      Success     DTR dialer
 8986                0         0        never                    Default

Table 128 describes additional fields shown in the display.

Table 128: Show Dialer Field Descriptions for DTR Dialers
Field Description

DTR SYNC

Indicates that DDR is enabled and that DTR dialing is enabled on this synchronous interface.

Last status: Success

Indicates that the last call was successful and that DTR dialing was used.

DTR dialer

Phrase appended to the Last status entry to indicate that this is a DTR dialer.

If an interface is connected to a destination, a display is provided that indicates the idle time before the line is disconnected. (The value decrements each second.) Then the duration of the current connection is shown. The following shows an example of this display; it appears after the third line in the show dialer display:

Time until disconnect 596 secs
Current call connected 0:00:25

After a call disconnects, the system displays the time remaining before being it can dial again. The following is an example of this display; it appears after the third line in the show dialer display:

Time until interface enabled 8 secs

If the show dialer command is issued for an interface on which DDR is not enabled, the system displays an error message. The following is a sample error message:

Async 1 - Dialing not enabled on this interface.

If an interface is configured for DDR, the show interfaces command displays the following message:

Async1 is up, line protocol is up (spoofing)
Hardware is Async Serial

The word spoofing indicates that the line really is not up, but the dialer is forcing the line to masquerade as "up" so that upper level protocols will continue to operate as expected. Spoofing is a state added to allow DDR to work. The interface "dials on demand" in response to packets being routed to it. But because no packets are routed to down interfaces, the interface must pretend to be up (spoof) so packets will be routed to it when it is not connected. Spoofing is the normal idle state on a dial-on-demand interface.

If caller ID screening is configured on an ISDN BRI, the show dialer command display includes a line similar to the following:

1 incoming call(s) have been screened.

This line reports the number of calls that have been screened.


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