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This chapter describes the commands to configure System 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 Router Products Configuration Guide.
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 | The MAC address of the downstream SNA device. It is a 48-bit dotted-triple address. |
lan-lsap | The local SAP address of the downstream SNA device in hexadecimal. For SNA, the address must be multiples of 4. |
lan-rsap | The destination SAP address from the perspective of the downstream SNA device in hexadecimal. For SNA, the address must be multiples of 4. |
serial port | The serial interface on which Frame Relay is configured. |
frame-relay dlci | The Frame Relay data link connection identifier. |
fr-lsap | The local SAP address of the logical link connection on the CFRAD. |
fr-rsap | The destination SAP address on the host. |
PFID2 | (Optional) The FID2 SNA transmission header for SNA peripheral traffic. |
AFID2 | (Optional) The FID2 transmission header for APPN traffic. |
FID4 | (Optional) The transmission header used on SNA subarea flows. |
No defaults are defined.
Interface configuration
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 | The SDLC address of the downstream SNA device in hexadecimal. |
serial port | The serial interface on which Frame Relay is configured. |
frame-relay dlci | The Frame Relay data link connection identifier. |
fr-lsap | The local SAP address of the logical link connection on the CFRAD. |
fr-rsap | The destination SAP address on the host. |
PFID | (Optional) The FID2 SNA transmission header for SNA peripheral traffic. |
AFID2 | (Optional) The FID2 transmission header for APPN traffic. |
FID4 | (Optional) The transmission header used on SNA subarea flows. |
No defaults are defined.
Interface configuration
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 frame-relay map llc2 interface configuration command to map LLC2 traffic to a DLCI.
frame-relay map llc2 dlci
dlci | The Frame Relay data link connection identifier. |
No defaults are defined.
Interface configuration
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
dlci | The Frame Relay data link connection identifier. |
No defaults are defined.
Interface configuration
The following example shows RSRB traffic mapped to DLCI number 30:
frame-relay map rsrb 30
encapsulation frame-relay
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. |
dwc dwc-number | (Optional) Specifies the number by which the working window value is divided when 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 nw-number value is 4 frames.
The default dwc-number value is 1.
Interface configuration
The following example specifies that to increment the working window 6 frames must be received, and that when BECN is indicated the working window value should be set to 1:
llc2 dynwind nw 6 dwc 1
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
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 28-1 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. |
Posted: Mon Oct 21 11:17:58 PDT 2002
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