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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.
Use the frame-relay map llc2 interface configuration command to map LLC2 traffic to a data-link connection identifier (DLCI).
frame-relay map llc2 dlci-number
dlci-number | Frame Relay DLCI. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
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-number
dlci-number | Frame Relay DLCI. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
The following example shows RSRB traffic mapped to DLCI number 30:
frame-relay map rsrb 30
You can use the master indexes or search online to find documentation of related commands.
encapsulation frame-relay
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
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. |
FRAS dial backup over DLSw+ is disabled.
Interface configuration
This command first appeared in Cisco IOS Release 11.2 F.
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).
The following example configures FRAS dial backup over DLSw+:
fras backup dlsw 4000.1000.2000 200 1000.5aed.1f53
You can use the master indexes or search online to find documentation of related commands.
dlsw local-peer
dlsw remote-peer tcp
frame-relay lmi-type
frame-relay map llc2
fras map llc
show fras
source-bridge ring-group
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]
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. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 11.1.
Multipule 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.
The following configuration 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
You can use the master indexes or search online to find documentation of related commands.
source-bridge ring-group
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
interface interface | The interface over which the backup connection is made. |
dlci-number | The DLCI number of the session. |
FRAS DLCI backup is disabled by default.
Interface configuration
This command first appeared in Cisco IOS Release 11.2 F.
The following example configures FRAS DLCI backup on serial interface 1:
fras ddr-backup interface serial1 188
You can use the master indexes or search online to find documentation of related commands.
show llc2
show fr pvc
show fras
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]
(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. |
The FRAS Host function for BAN is disabled for the Frame Relay subinterface.
The default bni is 4FFF.0000.0000.
Interface configuration
This command first appeared in Cisco IOS Release 11.2 F.
The following example enables the FRAS Host function for BAN:
fras-host ban Serial0 hmac 4001.3745.0001
You can use the master indexes or search online to find documentation of related commands.
fras ban
fras-host bnn
fras-host dlsw-local-ack
interface virtual-tokenring
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]
(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. |
FRAS Host for BNN is disabled for the Frame Relay subinterface.
Interface configuration
This command first appeared in Cisco IOS Release 11.2 F.
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
You can use the master indexes or search online to find documentation of related commands.
fras-host ban
fras-host dlsw-local-ack
fras-map
interface virtual-tokenring
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-ackThis command has no arguments or keywords.
The default state is FRAS Host LLC2 local termination disabled.
Interface configuration
This command first appeared in Cisco IOS Release 11.2 F.
The following command enables LLC2 local termination for FRAS Host connections using the virtual Token Ring:
fras-host dlsw-local-ack
You can use the master indexes or search online to find documentation of related commands.
dlsw local-peer
fras-host ban
fras-host bnn
interface virtual-tokenring
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
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. |
The default state is FRAS BNN enhancement disabled.
Interface configuration
This revised version of the fras map llc command for the enhanced FRAS BNN functionality first appeared in Cisco IOS Release 11.2 F.
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.
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
You can use the master indexes or search online to find documentation of related commands.
show fras
show llc2
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 | 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. |
No defaults are defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
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
You can use the master indexes or search online to find documentation of related commands.
number | Number of the virtual Token Ring. |
No defaults are assigned.
Interface configuration
This command first appeared in Cisco IOS Release 11.2 F.
The following example configures the virtual Token Ring interface:
interface virtual-tokenring 0
You can use the master indexes or search online to find documentation of related commands.
source bridge
fras ban
fras-host bnn
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. 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. |
The default nw-number value is 4.
The default dwc-number value is 1.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
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
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 frasThis command has no arguments or keywords.
Privileged EXEC
This command first appeared in Cisco IOS Release 11.1.
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 44 describes significant fields shown in the display.
| 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:
|
Backup is enabled | Notification displayed when the FRAS dial backup feature is configured. |
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]
(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. |
EXEC
This command first appeared in Cisco IOS Release 11.2 F.
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 45 describes significant fields shown in the display
| 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. |
You can use the master indexes or search online to find documentation of related commands.
fras-host ban
fras-host bnn
fras-host dlsw-local-ack
Use the show fras map privileged EXEC command to display the mapping and connection state of FRAS.
show fras mapThis command has no arguments or keywords.
Privileged EXEC
This command first appeared in Cisco IOS Release 10.3.
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 46 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. |
Use the source-bridge interface configuration command to configure an interface for source-route bridging. Use the no form of this command to disable source-route bridging on an interface.
source-bridge source-ring-number bridge-number target-ring-number [conserve-ring]
source-ring-number | Ring number for the interface's Token Ring or FDDI ring. It must be a decimal number in the range 1 to 4095 that uniquely identifies a network segment or ring within the bridged Token Ring or FDDI network |
bridge-number | Number that uniquely identifies the bridge connecting the source and target rings. It must be a decimal number in the range 1 to 15. |
target-ring-number | Ring number of the destination ring on this router. The number must be unique within the bridged Token Ring or FDDI network. The target ring can also be a ring group. It must be a decimal number. |
conserve-ring | (Optional) Keyword to enable SRB over Frame Relay. When this option is configured, the SRB software does not add the ring number associated with the Frame Relay partner's virtual ring (PVC) to outbound explorer frames. This option is permitted for Frame Relay subinterfaces only. |
SRB is disabled.
Interface configuration
This revised version of the source-bridge command to enable SRB over Frame Relay first appeared in Cisco IOS Release 11.2 F.
The parser automatically displays the word "active" in the source-bridge command in configurations that have SRB enabled. You do not need to enter the source-bridge command with the active keyword.
In the following example, Token Rings 129 and 130 are connected via a router:
interface tokenring 0 source-bridge 129 1 130 ! interface tokenring 1 source-bridge active 130 1 129
In the following example, an FDDI ring on one router is connected to a Token Ring on a second router across a DLSw+ link:
dlsw local-peer peer-id 132.11.11.2 dlsw remote-peer 0 tcp 132.11.11.3 interface fddi 0 no ip address multiring all source-bridge active 26 1 10 ! dlsw local-peer peer-id 132.11.11.3 dlsw remote-peer 0 tcp 132.11.11.2 interface tokenring 0 no ip address multiring all source-bridge active 25 1 10
In the following example, a router forwards frames from a locally attached Token Ring over the Frame Relay using SRB:
source-bridge ring-group 200 ! interface Serial0 encapsulation frame-relay ! interface Serial0.30 point-to-point frame-relay interface-dlci 30 ietf source-bridge 100 1 200 conserve-ring source-bridge spanning ! interface TokenRing0 source-bridge 600 1 200
You can use the master indexes or search online to find documentation of related commands.
debug frame-relay packet
debug source bridge
debug source error
debug source event
encapsulation frame-relay
frame-relay interface-dlci
source-bridge ring-group
source-bridge transparent
Posted: Tue Aug 22 11:18:05 PDT 2000
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