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SNA Frame Relay Access Support Commands

SNA Frame Relay Access Support Commands

This chapter describes the commands to configure Systems Network Architecture (SNA) Frame Relay access support. For SNA Frame Relay access support configuration tasks and examples, refer to the "Configuring SNA Frame Relay Access Support" chapter of the Bridging and IBM Networking Configuration Guide.


Note Because Frame Relay does not provide the reliable transport required by SNA, the RFC 1490 support of SNA uses Logical Link Control, type 2 (LLC2) as part of the encapsulation to provide link-level sequencing, acknowledgment, and flow control. The serial interface configured for Internet Engineering Task Force (IETF) encapsulation (RFC 1490) accepts all LLC2 interface configuration commands. For more information about LLC2 interface configuration commands, refer to the "LLC2 and SDLC Commands" chapter of this publication.

frame-relay map llc2

Use the frame-relay map llc2 interface configuration command to map LLC2 traffic to a DLCI.

frame-relay map llc2 dlci-number
Syntax Description
dlci-number Frame Relay data-link connection identifier.
Default

No defaults are defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

Example

The following example maps LLC2 traffic to DLCI number 200:

frame-relay map llc2 200

frame-relay map rsrb

Use the frame-relay map rsrb interface configuration command to specify the DLCI number onto which the RSRB traffic is to be mapped.

frame-relay map rsrb dlci-number
Syntax Description
dlci-number Frame Relay data-link connection identifier.
Default

No defaults are defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

Example

The following example shows RSRB traffic mapped to DLCI number 30:

frame-relay map rsrb 30
Related Command

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

encapsulation frame-relay +

fras ban

Use the fras ban interface configuration command to associate bridging over a Frame Relay network using boundary access node (BAN). Use the no form of this command to cancel each association.

fras ban local-ring bridge-number ring-group ban-dlci-mac dlci dlci#1 [dlci#2 ... dlci#5]
[bni mac-addr]
no fras ban local-ring bridge-number ring-group ban-dlci-mac dlci dlci#1 [dlci#2 ... dlci#5]
[bni mac-addr]

Syntax Description
local-ring Decimal number from 1 to 4095 describing the Token Ring interface.
bridge-number Decimal number from 1 to 15 that uniquely identifies a bridge connecting two rings.
ring-group Decimal number from 1 to 4095 representing a collection of Token Ring interfaces on one or more routers.
ban-dlci-mac Frame Relay BAN PVC MAC address.
dlci#1 [dlci#2 ... dlci#5] Frame Relay data-link connection identifier. Each DLCI number is unique and is a decimal within the range of 16 to 1007. The keyword dlci precedes the list of one or more DLCI numbers. If more than one DLCI number is needed for load balancing in the FRAS BAN configuration command, a maximum of five DLCI numbers are allowed.
bni mac-addr (Optional) Boundary node identifier (BNI) MAC address of the NCP that receives frames from the router.
Default

No defaults are defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.1.

Multipule fras ban commands may be configured; however, each fras ban command must use a unique DLCI MAC address.

You must configure the source-bridge ring-group global configuration command prior to the fras ban command.

Example

The following configuration shows FRAS BAN support for Token Ring and serial interfaces:

source-bridge ring-group 200
!
interface serial 0
 mtu 4000
 encapsulation frame-relay ietf
 frame-relay lmi-type ansi
 frame-relay map llc2  16
 frame-relay map llc2  17
 fras ban 120 1 200 4000.1000.2000 dlci 16 17
!
interface tokenring 0
 source-bridge 100 5 200
Related Command

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

source-bridge ring-group +

fras map llc

Use the fras map llc interface configuration command to associate an LLC connection with a Frame Relay connection. Use the no form of this command to cancel the association.

fras map llc mac-address lan-lsap lan-rsap serial port frame-relay dlci fr-lsap fr-rsap
[pfid2 | afid2 | fid4]
no fras map llc mac-address lan-lsap lan-rsap serial port frame-relay dlci fr-lsap
fr-rsap
[pfid2 | afid2 | fid4]

Syntax Description
mac-address Media Access Control (MAC) address of the downstream SNA device. It is a 48-bit dotted-triple address.
lan-lsap Local service access point (SAP) address of the downstream SNA device in hexadecimal. For SNA, the address must be multiples of 4.
lan-rsap Destination SAP address from the perspective of the downstream SNA device in hexadecimal. For SNA, the address must be multiples of 4.
serial port Serial interface on which Frame Relay is configured.
frame-relay dlci Frame Relay data-link connection identifier.
fr-lsap Local SAP address of the logical link connection on the Cisco Frame Relay access device (CFRAD).
fr-rsap Destination SAP address on the host.
pfid2 (Optional) Format indicator 2 (FID2) SNA transmission header for SNA peripheral traffic.
afid2 (Optional) FID2 transmission header for Advanced Peer-to-Peer Networking (APPN) traffic.
fid4 (Optional) Transmission header used on SNA subarea flows.
Default

No defaults are defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

You can map multiple LLC sessions to a DLCI.

Example

The following example associates an LLC connection to a Frame Relay connection:

fras map llc 0800.5a8f.8802 4 4 serial 0 frame-relay 200 4 4
Related Command

frame-relay map llc2

fras map sdlc

Use the fras map sdlc interface configuration command to associate an SDLC link with a Frame Relay DLCI. Use the no form of this command to cancel the association.

fras map sdlc sdlc-address serial port frame-relay dlci fr-lsap fr-rsap [pfid2 |
afid2 | fid4]
no fras map sdlc sdlc-address serial port frame-relay dlci fr-lsap fr-rsap [pfid2 |
afid2 | fid4]

Syntax Description
sdlc-address SDLC address of the downstream SNA device in hexadecimal.
serial port Serial interface on which Frame Relay is configured.
frame-relay dlci Frame Relay data-link connection identifier.
fr-lsap Local SAP address of the logical link connection on the CFRAD.
fr-rsap Destination SAP address on the host.
pfid (Optional) FID2 SNA transmission header for SNA peripheral traffic.
afid2 (Optional) FID2 transmission header for APPN traffic.
fid4 (Optional) Transmission header used on SNA subarea flows.
Default

No defaults are defined.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

You can map multiple SDLC links to a DLCI.

Example

The following example associates an SDLC link with a Frame Relay DLCI:

fras map sdlc c1 serial 0 frame-relay 200 4 4
Related Command

frame-relay map llc2

llc2 dynwind

Use the llc2 dynwind interface configuration command to enable dynamic window congestion management. Use the no form of this command to cancel the configuration.

llc2 dynwind [nw nw-number] [dwc dwc-number]
no llc2 dynwind [nw nw-number] [dwc dwc-number]

Syntax Description
nw nw-number (Optional) Specifies a number of frames that must be received to increment the working window value by 1. The default is 4.
dwc dwc-number (Optional) Specifies the number by which the working window value is divided when backward explicit congestion notification (BECN) occurs. Valid numbers are 1, 2, 4, 8, and 16. 1 is a special value that indicates that the working window value should be set to 1 when BECN is indicated. The default is 1.
Defaults

The default nw-number value is 4 frames.

The default dwc-number value is 1.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

Example

The following example specifies that to increment the working window six frames must be received, and the working window value should be set to 1 when BECN occurs:

llc2 dynwind nw 6 dwc 1

show fras

Use the show fras privileged EXEC command to display information about the connection state in FRAS, as well as current BAN information configured.

show fras
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.

Sample Display

The following is sample output from the show fras command:

Router# show fras 
Boundary Network Node (BNN): 
DLCI: 200
     Type   Destination     Int    LSap   RSap   Role   State
     tr     0800.5a8f.8802  tr0    4      8      P      ls_contacted
     fr     -               s1     10     4      S      ls_contacted
Boundary Access Node (BAN):
DLCI: 300          BNI: 4fff.0000.0000
     Type   Destination     Int    LSap   RSap   Role   State
     tr     1000.5acc.88ab  tr1    4      4      P      ls_contacted
     fr     -               s0     4      4      S      ls_contacted
     tr     1000.5acc.77bb  tr1    4      4      P      ls_contacted
     fr      -              s0     4      4      S      ls_contacted

Table 44 describes significant fields shown in the display.


Table 44: Show FRAS Field Descriptions
Field Description
Type Connection type. The display example shows Token Ring and Frame Relay.
Destination Destination MAC address from the perspective of the Cisco IOS software.
Int Interface that the connection resides on.
LSap Local SAP value.
RSap Remote SAP value.
Role Local link station role; P means Primary, S means Secondary.
State Link station protocol machine state. This value may be one of the following states:
     ls_reset
     ls_RqOpnStnSent
     ls_ExchgXid
     ls_ConnRqSent
     ls_SigStnWait
     ls_ConnRspWait
     ls_ConnRspSent
     ls_Contacted
     ls_DiscWait
BNI Boundary node identifier (BNI) that BAN uses as its destination MAC address. The BNI allows the NCP to identify BAN frames without being configured with the BAN DLCI MAC address. The BNI and the BAN DLCI MAC can be the same value. If the BNI and the BAN DLCI MAC are different values, the BNI column shows the DLCI MAC address value on the Token Ring connection.

show fras map

Use the show fras map privileged EXEC command to display the mapping and connection state of Frame Relay access support.

show fras map
Syntax Description

This command has no arguments or keywords.

Command Mode

Privileged EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

Sample Display

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

Router# show fras map
Type Destination    Int   LSap   RSap   Role   State
tr   0800.5a8f.8802 tr0   4      4      P      ls_contacted
fr   200            s0    4      4      S      ls_contacted

Table 45 describes significant fields shown in the display.


Table 45: Show FRAS Map Field Descriptions
Field Description
Type Interface type.
Destination Destination address.
Int Interface.
LSap Local SAP.
RSap Remote SAP.
Role Local link station role; P means Primary, S means Secondary.
State Link station protocol machine state.

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