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Chapter: 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

dlci

Frame Relay DLCI number on which to support local acknowledgment.


Defaults

No default behavior or values.

Command Modes

Interface configuration

Command History

Release
Modification

11.2 F

This command was introduced.


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 16

Related Commands

Command
Description

bstun lisnsap

Configures a SAP on which to listen for incoming calls.

bstun protocol-group

Defines a BSTUN group and the protocol it uses.

encapsulation frame-relay

Enables Frame Relay encapsulation.


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

dlci-number

Frame Relay DLCI.


Defaults

No default behavior or values.

Command Modes

Interface configuration

Command History

Release
Modification

10.3

This command was introduced.


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 30

Related Commands

Command
Description

encapsulation frame-relay

Enables Frame Relay encapsulation.


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

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.


Defaults

FRAS dial backup over DLSw+ is disabled. The default number of retries is 5.

Command Modes

Interface configuration

Command History

Release
Modification

11.2 F

This command was introduced.


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.1f53

Related Commands

Command
Description

dlsw local-peer

Defines the parameters of the DLSw+ local peer.

dlsw remote-peer tcp

Identifies the IP address of a peer with which to exchange traffic using TCP.

frame-relay lmi-type

Selects the LMI type.

frame-relay map llc2

Configures BSTUN over Frame Relay when using Bisync local acknowledgment.

fras map llc

Associates an LLC connection with a Frame Relay DLCI.

show fras

Displays 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.

source-bridge ring-group

Defines or removes a ring group from the configuration.


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

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. The dlci keyword precedes the list of one or more DLCI numbers. If you need more than one DLCI number for load balancing, you can configure up to five DLCI numbers, separated by spaces. Each DLCI number must be unique and must be a decimal in the range 16 through 1007.

bni mac-addr

(Optional) Boundary node identifier (BNI) MAC address of the NCP that receives frames from the router.


Defaults

No default behavior or values.

Command Modes

Interface configuration

Command History

Release
Modification

11.1

This command was introduced.


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 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 Commands

Command
Description

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

Release
Modification

11.2 F

This command was introduced.


Examples

The following example configures FRAS DLCI backup on serial interface 1: 

fras ddr-backup interface serial1 188

Related Commands

Command
Description

show llc2

Displays the LLC2 connections active in the router.

show frame-relay pvc

Displays statistics about PVCs for Frame Relay interfaces.

show fras

Displays 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.


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

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.


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

Release
Modification

11.2 F

This command was introduced.


Examples

The following example enables the FRAS Host function for BAN: 

fras-host ban Serial0 hmac 4001.3745.0001

Related Commands

Command
Description

fras ban

Associates bridging over a Frame Relay network using BAN.

fras-host bnn

Enables the FRAS Host function for BNN.

fras-host dlsw-local-ack

Enables LLC2 local termination for FRAS Host connections using the virtual Token Ring.

interface virtual-tokenring

Creates a virtual Token Ring interface.


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

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.


Defaults

FRAS Host for BNN is disabled for the Frame Relay subinterface.

Command Modes

Interface configuration

Command History

Release
Modification

11.2 F

This command was introduced.


Examples

The following example enables the FRAS Host function for BNN: 

fras-host bnn Serial0 fr-lsap 04 vmac 4005.3003.0000 hmac 4001.3745.0001

Related Commands

Command
Description

fras-host ban

Enables the FRAS Host function for BAN.

fras-host dlsw-local-ack

Enables LLC2 local termination for FRAS Host connections using the virtual Token Ring.

fras map sdlc

Associates an SDLC link with a Frame Relay DLCI.

interface virtual-tokenring

Creates a virtual Token Ring interface.


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

Release
Modification

11.2 F

This command was introduced.


Examples

The following example enables LLC2 local termination for FRAS Host connections using the virtual Token Ring: 

fras-host dlsw-local-ack

Related Commands

Command
Description

dlsw local-peer

Defines the parameters of the DLSw+ local peer.

fras-host ban

Enables the FRAS Host function for BAN.

fras-host bnn

Enables the FRAS Host function for BNN.

interface virtual-tokenring

Creates a virtual Token Ring interface.


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

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.


Defaults

The default state is FRAS BNN enhancement is disabled.

Command Modes

Interface configuration

Command History

Release
Modification

11.2 F

This command was introduced.


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 04

Related Commands

Command
Description

show fras

Displays 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.

show llc2

Displays the LLC2 connections active in the router.


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

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.


Defaults

No default behavior or values.

Command Modes

Interface configuration

Command History

Release
Modification

10.3

This command was introduced.


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 4

Related Commands

Command
Description

frame-relay map llc2

Configures BSTUN over Frame Relay when using Bisync local acknowledgment.


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

number

Number of the virtual Token Ring.


Defaults

No default behavior or values.

Command Modes

Interface configuration

Command History

Release
Modification

11.2 F

This command was introduced.


Examples

The following example configures the virtual Token Ring interface: 

interface virtual-tokenring 0

Related Commands

Command
Description

source-bridge

Configures an interface for SRB.

fras ban

Associates bridging over a Frame Relay network using BAN.

fras-host bnn

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

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.


Defaults

The default nw-number value is 4.

The default dwc-number value is 1.

Command Modes

Interface configuration

Command History

Release
Modification

10.3

This command was introduced.


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 1

show 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

Release
Modification

11.1

This command was introduced.


Examples

The following is sample output from the show fras command: 

Router# show fras


Boundary Network Node (BNN): 

DLCI: 66

  Type   Destination      Int    LSap  RSap   Role  State

  fr                             4      4     S     ls_reset (Backup is enabled)

  llc    0000.f63a.2f50   To0    4      4     P     ls_contacted


Table 46 describes significant fields shown in the display.

Table 46 show fras Field Descriptions 

Field
Description

Type

Connection type. The display example shows LLC and Frame Relay.

Destination

Destination MAC address from the perspective of the Cisco IOS software.

Int

Interface on which the connection resides.

LSap

Local SAP value.

RSap

Remote SAP value.

Role

Local link station role; P means primary and S means secondary.

State

Link station protocol machine state. This value may be one of the following states:

•ls_reset—Initial state.

•ls_RqOpnStnSent—TEST frame sent; request to open a connection endpoint.

•ls_ExchgXid—XID negotiation taking place.

•ls_ConnRqSent—SABME sent (connecting side).

•ls_SigStnWait—Waiting for signal to clean up the congestion and respond to polling with an RNR.

•ls_ConnRspWait—Wait for the other connection endpoint to bring up the link.

•ls_ConnRspSent—A UA has been sent and the router is waiting for a RR to clear up the flow.

•ls_Contacted—Everything is connected

•ls_DiscWait—Wait for acknowledge to disconnect request.

Backup is enabled

Notification displayed when the FRAS dial backup feature is configured.


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

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.


Command Modes

EXEC

Command History

Release
Modification

11.2 F

This command was introduced.


Examples

The following is sample output from the show fras-host command: 

router# show fras-host


Number of Active Control Blocks = 2

Number of Available Control Blocks in Pool = 126


Port	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	4000.3000.2000

Table 47 describes significant fields shown in the display.

Table 47 show fras-host Field Descriptions 

Field
Description

Port

Frame Relay interface or subinterface associated with this LLC2 session.

DLCI

DLCI number associated with this LLC2 session

Type

FRAS encapsulation type associated with this LLC2 session

FrRsap

Frame Relay Remote LLC2 SAP associated with this LLC2 session. This SAP is the source sap on LLC2 frames sent by the remote FRAD.

FrLSap

Frame Relay Local LLC2 SAP associated with this LLC2 session. This SAP is the destination SAP on LLC2 frames sent by the remote FRAD.

HostSap

Destination SAP on LLC2 frames sent to the CIP or LAN-attached AS/400. This SAP is identical to FrLsap unless the hsap keyword is specified on the fras-host bnn command.

VMac

MAC address associated with the remote FRAD for this LLC2 session.

HostMac

MAC address associated with the host for this LLC2 session.


Related Commands

Command
Description

fras-host ban

Enables the FRAS Host function for BAN.

fras-host bnn

Enables the FRAS Host function for BNN.

fras-host dlsw-local-ack

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

Release
Modification

10.3

This command was introduced.


Examples

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 48 describes significant fields shown in the display.

Table 48 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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