Table Of Contents
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 (FRAS). For SNA FRAS configuration tasks and examples, refer to the "Configuring SNA Frame Relay Access Support" chapter of the Cisco IOS 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."
frame-relay map llc2
To configure BSTUN over Frame Relay when using Bisync local acknowledgment, use the frame-relay map llc2 interface configuration command. To cancel the configuration, use the no form of this command.
frame-relay map llc2 dlci
no frame-relay map llc2 dlci
Syntax Description
Defaults
No default behavior or values.
Command Modes
Interface configuration
Command History
Usage Guidelines
Direct encapsulation over Frame Relay is supported only for an encapsulation type of cisco, configured using the encapsulation frame-relay command.
Examples
The following example maps BSTUN traffic to DLCI number 16:
frame-relay map DLCI 16Related Commands
frame-relay map rsrb
To specify the DLCI number onto which the RSRB traffic is to be mapped, use the frame-relay map rsrb interface configuration command. To cancel the RSRB map, use the no form of this command.
frame-relay map rsrb dlci-number
no frame-relay map rsrb
Syntax Description
Defaults
No default behavior or values.
Command Modes
Interface configuration
Command History
Usage Guidelines
Direct encapsulation over Frame Relay is supported only for an encapsulation type of cisco, configured using the encapsulation frame-relay command.
Examples
The following example shows RSRB traffic mapped to DLCI number 30:
frame-relay map rsrb 30Related Commands
fras backup dlsw
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. To cancel the backup configuration, use the no form of this command.
fras backup dlsw virtual-mac-address target-ring-number host-mac-address [retry retry-number]
no fras backup dlsw virtual-mac-address target-ring-number host-mac-address [retry retry-number]
Syntax Description
Defaults
FRAS dial backup over DLSw+ is disabled. The default number of retries is 5.
Command Modes
Interface configuration
Command History
Usage Guidelines
Configure DLSw+ as normally required. Specify the optional keyword dynamic at the end of the dlsw remote-peer configuration command to enable the peer relationship to be established only when needed (for example, when the fras backup dlsw command becomes active).
Examples
The following example configures FRAS dial backup over DLSw+:
fras backup dlsw 4000.1000.2000 200 1000.5aed.1f53Related Commands
fras ban
To associate bridging over a Frame Relay network using boundary access node (BAN), use the fras ban interface configuration command. To cancel each association, use the no form of this command.
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
Defaults
No default behavior or values.
Command Modes
Interface configuration
Command History
Usage Guidelines
Multiple 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 configuring the fras ban command.
Examples
The following example shows FRAS BAN support for Token Ring and serial interfaces:
source-bridge ring-group 200!interface serial 0mtu 4000encapsulation frame-relay ietfframe-relay lmi-type ansiframe-relay map llc2 16frame-relay map llc2 17fras ban 120 1 200 4000.1000.2000 dlci 16 17!interface tokenring 0source-bridge 100 5 200Related Commands
source-bridge ring-group
Defines or removes a ring group from the configuration.
fras ddr-backup
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. To cancel the backup configuration, use the no form of this command.
fras ddr-backup interface interface dlci-number
no fras ddr-backup
Syntax Description
interface interface
Interface over which the backup connection is made.
dlci-number
DLCI number of the session.
Defaults
FRAS DLCI backup is disabled by default.
Command Modes
Interface configuration
Command History
Examples
The following example configures FRAS DLCI backup on serial interface 1:
fras ddr-backup interface serial1 188Related Commands
fras-host ban
To enable the FRAS Host function for BAN, use the fras-host ban interface configuration command. To disable the FRAS Host BAN functionality, use the no form of this command.
fras-host ban interface hmac hmac [bni bni]
no fras-host ban
Syntax Description
Defaults
The FRAS Host function for BAN is disabled for the Frame Relay subinterface.
The default bni is 4FFF.0000.0000.
Command Modes
Interface configuration
Command History
Examples
The following example enables the FRAS Host function for BAN:
fras-host ban Serial0 hmac 4001.3745.0001Related Commands
fras-host bnn
To enable the FRAS Host function for BNN, use the fras-host bnn interface configuration command. To disable the FRAS Host function, use the no form of this command.
fras-host bnn interface fr-lsap sap vmac virt-mac hmac hmac [hsap hsap]
no fras-host bnn
Syntax Description
Defaults
FRAS Host for BNN is disabled for the Frame Relay subinterface.
Command Modes
Interface configuration
Command History
Examples
The following example enables the FRAS Host function for BNN:
fras-host bnn Serial0 fr-lsap 04 vmac 4005.3003.0000 hmac 4001.3745.0001Related Commands
fras-host dlsw-local-ack
To enable LLC2 local termination for FRAS Host connections using the virtual Token Ring, use the fras-host dlsw-local-ack interface configuration command. To disable LLC2 local termination, use the no form of this command.
fras-host dlsw-local-ack
no fras-host dlsw-local-ack
Syntax Description
This command has no arguments or keywords.
Defaults
The default state is FRAS Host LLC2 local termination disabled.
Command Modes
Interface configuration
Command History
Examples
The following example enables LLC2 local termination for FRAS Host connections using the virtual Token Ring:
fras-host dlsw-local-ackRelated Commands
fras map llc
To associate an LLC connection with a Frame Relay DLCI, use the fras map llc interface configuration command. To disable the association, use the no form of this command.
fras map llc lan-lsap serial interface frame-relay dlci dlci fr-rsap
no fras map llc lan-lsap serial interface frame-relay dlci dlci fr-rsap
Syntax Description
Defaults
The default state is FRAS BNN enhancement is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
If the destination SAP specified by the end station is equal to lan-lsap, the router associates the LLC (LAN) connection with the Frame Relay DLCI.
The MAC address and the SAP address of the end station are no longer required for the BNN enhanced configuration.
Examples
In the FRAS BNN enhancement, the revised fras map llc command achieves the same result as using multiple fras map llc commands in the original FRAS BNN implementation. The following example provides one map definition for both end stations:
fras map llc 4 Serial 0 frame-relay dlci 16 04Related Commands
fras map sdlc
To associate an SDLC link with a Frame Relay DLCI, use the fras map sdlc interface configuration command. To cancel the association, use the no form of this command.
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
Defaults
No default behavior or values.
Command Modes
Interface configuration
Command History
Usage Guidelines
You can map multiple SDLC links to a DLCI.
Examples
The following example associates an SDLC link with a Frame Relay DLCI:
fras map sdlc c1 serial 0 frame-relay 200 4 4Related Commands
interface virtual-tokenring
To create a virtual Token Ring interface, use the interface virtual-tokenring interface configuration command. To cancel the configuration, use the no form of this command.
interface virtual-tokenring number
no interface virtual-tokenring
Syntax Description
Defaults
No default behavior or values.
Command Modes
Interface configuration
Command History
Examples
The following example configures the virtual Token Ring interface:
interface virtual-tokenring 0Related Commands
source-bridge
Configures an interface for SRB.
Associates bridging over a Frame Relay network using BAN.
Enables the FRAS Host function for BNN.
llc2 dynwind
To enable dynamic window congestion management, use the llc2 dynwind interface configuration command. To cancel the configuration, use the no form of this command.
llc2 dynwind [nw nw-number] [dwc dwc-number]
no llc2 dynwind [nw nw-number] [dwc dwc-number]
Syntax Description
Defaults
The default nw-number value is 4.
The default dwc-number value is 1.
Command Modes
Interface configuration
Command History
Examples
The following example specifies that to increment the working window 6 frames must be received, and the working window value should be set to 1 when BECN occurs:
llc2 dynwind nw 6 dwc 1show fras
To view notification that the FRAS dial backup over DLSw+ feature is active, information about the connection state in FRAS, and information about current BNN, BAN, and dial backup, use the show fras privileged EXEC command.
show fras
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Examples
The following is sample output from the show fras command:
Router# show frasBoundary Network Node (BNN):DLCI: 66Type Destination Int LSap RSap Role Statefr 4 4 S ls_reset (Backup is enabled)llc 0000.f63a.2f50 To0 4 4 P ls_contactedTable 46 describes significant fields shown in the display.
show fras-host
To display the status of LLC2 sessions using FRAS Host, use the show fras-host EXEC command.
show fras-host [interface] [dlci dlci-num] [detail]
Syntax Description
Command Modes
EXEC
Command History
Examples
The following is sample output from the show fras-host command:
router# show fras-hostNumber of Active Control Blocks = 2Number of Available Control Blocks in Pool = 126Port DLCI Type FrRsap FrLSap HostSap VMac HostMac Se0 16 BNN 04 08 04 4000.ABBA.001E 4000.3000.2000 Se1 37 BAN 04 04 04 4000.0223.0019 4000.3000.2000Table 47 describes significant fields shown in the display.
Related Commands
Enables the FRAS Host function for BAN.
Enables the FRAS Host function for BNN.
Enables LLC2 local termination for FRAS Host connections using the virtual Token Ring.
show fras map
To display the mapping and connection state of FRAS, use the show fras map privileged EXEC command.
show fras map
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Examples
The following is sample output from the show fras map command:
Router# show fras mapType Destination Int LSap RSap Role Statetr 0800.5a8f.8802 tr0 4 4 P ls_contactedfr 200 s0 4 4 S ls_contactedTable 48 describes significant fields shown in the display.
