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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.
Use the frame-relay map llc2 interface configuration command to map LLC2 traffic to a DLCI.
frame-relay map llc2 dlci-number| dlci-number | Frame Relay data-link connection identifier. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
The following example maps LLC2 traffic to DLCI number 200:
frame-relay map llc2 200
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| dlci-number | Frame Relay data-link connection identifier. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
The following example shows RSRB traffic mapped to DLCI number 30:
frame-relay map rsrb 30
A dagger (+) indicates that the command is documented outside this chapter.
encapsulation frame-relay +
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]| 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. |
No defaults are defined.
Interface configuration
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.
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
A dagger (+) indicates that the command is documented outside this chapter.
source-bridge ring-group +
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| 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. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
You can map multiple LLC sessions to a DLCI.
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
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 || 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. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
You can map multiple SDLC links to a DLCI.
The following example associates an SDLC link with a Frame Relay DLCI:
fras map sdlc c1 serial 0 frame-relay 200 4 4
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]| 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. |
The default nw-number value is 4 frames.
The default dwc-number value is 1.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
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
Use the show fras privileged EXEC command to display information about the connection state in FRAS, as well as current BAN information configured.
show frasThis command has no arguments or keywords.
Privileged EXEC
This command first appeared in Cisco IOS Release 11.1.
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.
| 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. |
Use the show fras map privileged EXEC command to display the mapping and connection state of Frame Relay access support.
show fras mapThis command has no arguments or keywords.
Privileged EXEC
This command first appeared in Cisco IOS Release 10.3.
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.
| 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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