Table Of Contents

SNA Frame Relay Access Support Commands

frame-relay map llc2

frame-relay map rsrb

fras backup dlsw

fras ban

fras ddr-backup

fras-host ban

fras-host bnn

fras-host dlsw-local-ack

fras map llc

fras map sdlc

interface virtual-tokenring

llc2 dynwind

show fras

show fras-host

show fras map

SNA Frame Relay Access Support Commands

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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 Bridging and IBM Networking Configuration Guide.

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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."

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frame-relay map llc2

Use the frame-relay map llc2 interface configuration command to configure BSTUN over Frame Relay when using Bisync local acknowledgment. Use the no form of this command to cancel the configuration.

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 is specified.

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 cisco 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

Use the frame-relay map rsrb interface configuration command to specify the DLCI number onto which the RSRB traffic is to be mapped. Use the no form of this command to cancel the RSRB map.

frame-relay map rsrb dlci-number

no frame-relay map rsrb

Syntax Description

dlci-number

Frame Relay DLCI.

Defaults

No defaults are defined.

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 cisco 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

Use the fras backup dlsw interface configuration command 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 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]

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.

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	Maps LLC2 traffic to a DLCI.
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

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][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#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.

Defaults

No defaults are defined.

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

Use the fras ddr-backup interface configuration command to configure an auxiliary interface for use as a backup when the primary Frame Relay link to the Frame Relay WAN fails. Use the no form of this command to cancel the backup configuration.

fras ddr-backup interface interface dlci-number

no fras ddr-backup

Syntax Description

interface interface	The interface over which the backup connection is made.
dlci-number	The 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

Use the fras-host ban interface configuration command to enable the FRAS Host function for BAN. Use the no form of this command to disable the FRAS Host BAN functionality.

fras-host ban (sub)interface hmac hmac [bni bni]

no fras-host ban

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.

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

Use the fras-host bnn interface configuration command to enable the FRAS Host function for BNN. 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]

no fras-host bnn

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 adaptor 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

Use the fras-host dlsw-local-ack interface configuration command to enable LLC2 local termination for FRAS Host connections using the virtual Token-Ring. Use the no form of this command to disable LLC2 local termination.

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

Use the fras map llc interface configuration command to associate an LLC connection with a Frame Relay DLCI. Use the no form of this command to disable the association.

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 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

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 | 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 defaults are defined.

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	Maps LLC2 traffic to a DLCI.

interface virtual-tokenring

Use the interface virtual-tokenring command to create a virtual Token Ring interface. Use the no form of this command to cancel the configuration.

interface virtual-tokenring number

no interface virtual-tokenring

Syntax Description

number

Number of the virtual Token Ring.

Defaults

No defaults are assigned.

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

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]

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

Use the show fras privileged EXEC command 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.

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 41 describes significant fields shown in the display.

Table 41 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 end point 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

Use the show fras-host EXEC command to display the status of LLC2 sessions using FRAS Host.

show fras-host [(sub)interface] [dlci dlci-num] [detail]

Syntax Description

(sub)interface	Only display LLC2 sessions from a specified Frame Relay interface or subinterface.
dlci dlci-number	Only display LLC2 sessions from a specified DLCI.
detail	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 42 describes significant fields shown in the display

Table 42 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 will be identical to FrLsap unless the hsap parameter is configured 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

Use the show fras map privileged EXEC command to display the mapping and connection state of FRAS.

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 43 describes significant fields shown in the display.

Table 43 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.