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This chapter explains the function and syntax of the SNA frame relay access support commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS Bridging and IBM Networking Command Reference, Volume 1, Release 12.1.
To configure BSTUN over Frame Relay when using Bisync local acknowledgment, use the frame-relay map llc2 interface configuration command. Use the no form of this command to cancel the configuration.
frame-relay map llc2 dlci
Syntax Description
dlci Frame Relay DLCI number on which to support local acknowledgment.
To specify the DLCI number onto which the RSRB traffic is to be mapped, use the frame-relay map rsrb interface configuration command. Use the no form of this command to cancel the RSRB map.
frame-relay map rsrb dlci-number
Syntax Description
dlci-number Frame Relay DLCI.
To configure an auxiliary route between the end stations and the host for use as a backup when the DLCI connection to the Frame Relay network is lost, use the fras backup dlsw interface configuration command. Use the no form of this command to cancel the backup configuration.
fras backup dlsw virtual-mac-address target-ring-number host-mac-address [retry retry-number]
Syntax Description
virtual-mac-address 12-digit hexadecimal string used as a source MAC address for all packets going to the host. target-ring-number Number configured in the source-bridge ring-group command. This is a virtual ring. The valid range is 1 to 4095. host-mac-address Destination MAC address of the host. retry retry-number (Optional) Number of attempts by the end station to reconnect to the primary Frame Relay interface before activating the backup link. The range is 1 to 5 retries. If the retry option is not specified, the default number of retries is 5.
To associate bridging over a Frame Relay network using boundary access node (BAN), use the fras ban interface configuration command. 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]
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 dlci#1 [dlci#2 dlci#5] Frame Relay DLCI. 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.
To configure an auxiliary interface for use as a backup when the primary Frame Relay link to the Frame Relay WAN fails, use the fras ddr-backup interface configuration command. Use the no form of this command to cancel the backup configuration.
fras ddr-backup interface interface dlci-number
Syntax Description
interface interface Interface over which the backup connection is made. dlci-number DLCI number of the session.
To enable the FRAS Host function for BAN, use the fras-host ban interface configuration command. Use the no form of this command to disable the FRAS Host BAN functionality.
fras-host ban (sub)interface hmac hmac [bni bni]
Syntax Description
(sub)interface Associated Frame Relay interface or subinterface. hmac hmac MAC address of the CIP adapter or LAN-attached host. bni bni (Optional) Boundary node identifier MAC address. The default bni is 4FFF.0000.0000.
To enable the FRAS Host function for BNN, use the fras-host bnn interface configuration command. Use the no form of this command to disable the FRAS Host function.
fras-host bnn (sub)interface fr-lsap sap vmac virt-mac hmac hmac [hsap hsap]
Syntax Description
(sub)interface Associated Frame Relay interface or subinterface. fr-lsap sap LLC2 service access point (SAP). The destination SAP on inbound BNN frames received from Frame Relay. vmac virt-mac Used in combination with the DLCI number to form a unique MAC address. The first 4 bytes of the MAC address are formed by the VMAC while the last 2 bytes are formed from the DLCI number. The last 2 bytes of the VMAC must be configured as zeros. hmac hmac MAC address of the CIP adapter or LAN-attached host. hsap hsap (Optional) Host SAP. If this parameter is not specified, the host SAP value used will match fr-lsap.
To enable LLC2 local termination for FRAS Host connections using the virtual Token-Ring, use the fras-host dlsw-local-ack interface configuration command. Use the no form of this command to disable LLC2 local termination.
fras-host dlsw-local-ackSyntax Description
This command has no arguments or keywords.
To associate an LLC connection with a Frame Relay DLCI, use the fras map llc interface configuration command. Use the no form of this command to disable the association.
fras map llc lan-lsap serial interface frame-relay dlci dlci fr-rsap
Syntax Description
lan-lsap LLC2 LAN SAP that is the local SAP address of the router. serial interface Serial interface on which Frame Relay is configured. frame-relay dlci dlci Frame Relay DLCI. fr-rsap LLC2 Frame Relay SAP that is the destination SAP of the router on the Frame Relay side.
To associate an SDLC link with a Frame Relay DLCI, use the fras map sdlc interface configuration command. 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]
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 DLCI. 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. 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.
To create a virtual Token Ring interface, use the interface virtual-tokenring command. Use the no form of this command to cancel the configuration.
interface virtual-tokenring number
Syntax Description
number Number of the virtual Token Ring.
To enable dynamic window congestion management, use the llc2 dynwind interface configuration command. Use the no form of this command to cancel the configuration.
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 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.
To view notification that the FRAS dial backup over DLSw+ feature is active, to display information about the connection state in FRAS, and to display current BNN, BAN, and dial backup information, use the show fras privileged EXEC command.
show frasSyntax Description
This command has no arguments or keywords.
To display the status of LLC2 sessions using FRAS Host, use the show fras-host EXEC command.
show fras-host [(sub)interface] [dlci dlci-num] [detail]
Syntax Description
(sub)interface (Optional) Only display LLC2 sessions from a specified Frame Relay interface or subinterface. dlci dlci-number (Optional) Only display LLC2 sessions from a specified DLCI. detail (Optional) Display additional information such as the routing information fields (RIFs) and statistics associated with the LLC2 sessions.
To display the mapping and connection state of FRAS, use the show fras map privileged EXEC command.
show fras mapSyntax Description
This command has no arguments or keywords.
Posted: Wed Jul 26 11:09:10 PDT 2000
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