Cisco IOS Switching Services Configuration Guide, Release 12.2
Configuring Token Ring LAN Emulation for MPOA
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Configuring Token Ring LAN Emulation for Multiprotocol over ATM

Table Of Contents

Configuring Token Ring LAN Emulation for Multiprotocol over ATM

How Token Ring MPOA Works

Token Ring LANE for MPOA Configuration Task List

Configuring a Token Ring LEC

Configuring the LECS Database

Configuring the LES/BUS

Token Ring LANE Configuration Examples

MPOA Token Ring LANE Configuration in an IP-Routed Domain Example

MPOA Token Ring LANE Configuration in an IP SRB-Routed Domain Example


Configuring Token Ring LAN Emulation for Multiprotocol over ATM


This chapter describes the required and optional tasks for configuring the MPOA for Token Ring Networks feature.

For a complete description of the commands in this chapter, refer to the the Cisco IOS Switching Services Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.

To identify the hardware platform or software image information associated with a feature, use the Feature Navigator on Cisco.com to search for information about the feature or refer to the software release notes for a specific release. For more information, see the section "Identifying Supported Platforms" in the chapter "Using Cisco IOS Software."

The MPOA for Token Ring Networks feature allows Token Ring hosts on an ATM network to communicate over direct paths (called shortcuts) through the ATM network. These shortcuts bypass the intermediate router hops that otherwise would be encountered in the default path.

How Token Ring MPOA Works

Token Ring Multiprotocol over ATM (MPOA) is an extension to LAN Emulation (LANE). It allows Token Ring LANE clients to forward IP packets between subnets to other Token Ring LANE clients through a shortcut in the ATM network. The Token Ring LANE clients have an MPOA client (MPC) communicating with an MPOA server (MPS) to establish this shortcut.

Token Ring LANE for MPOA Configuration Task List

To configure Token Ring LANE for MPOA, perform the tasks described in the following sections:

Configuring a Token Ring LEC

Configuring the LECS Database

Configuring the LES/BUS

Configuring a Token Ring LEC

For MPOA operation, a LEC must be associated with an MPS, an MPC, or both. Once a LEC is bound to a particular MPS/MPC, it cannot be bound to another MPS/MPC at the same time.

The LEC must also be associated with a physical interface or subinterface, which may be different from the physical interface associated with the MPS or MPC. For proper operation, all interfaces must belong to the same ATM network.

To configure a Token Ring LEC, use the following commands beginning in global configuration mode:

 
Command
Purpose

Step 1 

Router(config)# interface atm {slot/port.subinterface-number | number.subinterface-number}

Specifies the ATM interface to be associated with the LEC.

Step 2 

Router(config-if)# lane client tokenring [elan-name]

Defines a Token Ring LEC on a specified ELAN name.

Step 3 

Router(config-if)# lane client mpoa server mps-name

(Optional) Binds a Token Ring LEC to an MPS.

Step 4 

Router(config-if)# lane client mpoa client mpc-name

(Optional) Binds a Token Ring LEC to an MPC.

Configuring the LECS Database

To configure the LECS database, use the following commands in beginning global configuration mode:

 
Command
Purpose

Step 1 

Router(config)# lane database database-name

Creates a named database for the LECS.

Step 2 

Router(lane-config-dat)# name elan-name server-atm-address atm-address

Binds the name of the ELAN to the ATM address of the LES.

Step 3 

Router(lane-config-dat)# name elan-name elan-id id

Defines the ELAN ID in the LECS database to participate in MPOA.

Step 4 

Router(lane-config-dat)# name elan-name local-seg-id id

Configures the local segment ID number.

Configuring the LES/BUS

To configure the LES/BUS, use the following commands in beginning global configuration mode:

 
Command
Purpose

Step 1 

Router(config)# interface atm {slot/port.subinterface-number | number.subinterface-number}

Specifies the ATM subinterface to be associated with the LES/BUS.

Step 2 

Router(config-if)# lane server-bus tokenring elan-name [elan-id elan-id]

Defines a Token Ring LES/BUS on the named ELAN. The ELAN ID is optional.

Token Ring LANE Configuration Examples

This section provides the following sample configurations of MPOA in a Token Ring LANE environment:

MPOA Token Ring LANE Configuration in an IP-Routed Domain Example

MPOA Token Ring LANE Configuration in an IP SRB-Routed Domain Example

MPOA Token Ring LANE Configuration in an IP-Routed Domain Example

Figure 101 illustrates MPOA in a Token Ring LANE environment where MPC-to-MPC shortcuts are established between Token Ring LANE edge routers that reside in different IP-routed domains.

Figure 101 Token Ring MPOA—MPC to MPC Shortcut in an IP Routed Environment

The following commands show a sample configuration for Router-1 in Figure 101:

hostname Router-1
!
ip routing
!
! Define the MPOA Client (mpc-1) configuration.
!
mpoa client config name mpc-1
!
! Configure an IP address on the Token Ring interface.
!
interface TokenRing1/0
 ip address 5.5.5.2 255.255.255.0
 ring-speed 16
!
! Configure a config-server and bind it to its database (mpoa-db).
! Attach the MPOA client mpc-1 to its ATM interface.
!
interface ATM2/0
 no ip address
 atm pvc 1 0 5 qsaal
 atm pvc 2 0 16 ilmi
 lane config auto-config-atm-address
 lane config database mpoa-db
 mpoa client name mpc-1
!
! Configure a LANE server-bus and LANE client on ELAN 1. Bind the
! LANE client to its MPOA Client (mpc-1). 
!
interface ATM2/0.1 multipoint
 ip address 1.1.1.1 255.255.255.0
 lane server-bus tokenring 1
 lane client mpoa client name mpc-1
 lane client tokenring 1
!
router eigrp 1
 network 1.0.0.0
 network 5.0.0.0
!
end

The following commands show a sample configuration for Router-2 in Figure 101:

hostname Router-2
!
ip routing
!
! Configure the config-server database mpoa-db with configuration
! for ELANs 1 to 3
!
lane database mpoa-db
 name 1 server-atm-address 47.0091810000000060705BFA01.00000CA05F41.01
 name 1 local-seg-id 1000
 name 1 elan-id 100
 name 2 server-atm-address 47.0091810000000060705BFA01.00000CA05B41.01
 name 2 local-seg-id 2000
 name 2 elan-id 200
 name 3 server-atm-address 47.0091810000000060705BFA01.00000CA05B41.03
 name 3 local-seg-id 3000
 name 3 elan-id 300
!
! Define the MPOA Server (mps-1) configuration.
mpoa server config name mps-1
!
! Configure the signalling and ILMI PVCs. Also configure a config-server
! and attach the MPOA server (mps-1) to its ATM interface.
!
interface ATM4/0
 no ip address
 atm pvc 1 0 5 qsaal
 atm pvc 2 0 16 ilmi
 lane config auto-config-atm-address
 lane config database mpoa-db
 mpoa server name mps-1
!
! Configure a Token Ring LANE client on ELAN 1 and bind the LANE
! client to its MPOA server (mps-1). 
!
interface ATM4/0.1 multipoint
 ip address 1.1.1.2 255.255.255.0
 lane client mpoa server name mps-1
 lane client tokenring 1
!
! Configure a Token Ring LANE client on ELAN 2 and bind the LANE
! client to its MPOA server (mps-1)
!
interface ATM4/0.2 multipoint
 ip address 2.2.2.1 255.255.255.0
 lane client mpoa server name mps-1
 lane client tokenring 2
!
router eigrp 1
 network 1.0.0.0
 network 2.0.0.0
!
end

The following commands show a sample configuration for Router-3 in Figure 101:

hostname Router-3
!
ip routing
!
! Defines the MPOA Server (mps-2) configuration.
mpoa server config name mps-2
!
! Configure the signalling and ILMI PVCs and attach the MPOA
! server (mps-2) to its ATM interface.
!
interface ATM2/0
 no ip address
 atm pvc 1 0 5 qsaal
 atm pvc 2 0 16 ilmi
 mpoa server name mps-2
!
! Configure a Token Ring LANE client and LANE server-bus on ELAN 2
! and bind the LANE client to its MPOA server (mps-2)
!
interface ATM2/0.1 multipoint
 ip address 2.2.2.2 255.255.255.0
 lane server-bus tokenring 2
 lane client mpoa server name mps-2
 lane client tokenring 2
!
! Configure a Token Ring LANE client on ELAN 3 and bind the LANE
! client to its MPOA server (mps-2)
!
interface ATM2/0.3 multipoint
 ip address 3.3.3.1 255.255.255.0
 lane server-bus tokenring 3
 lane client mpoa server name mps-2
 lane client tokenring 3
!
router eigrp 1
 network 2.0.0.0
 network 3.0.0.0
!
end

The following commands show a sample configuration for Router-4 in Figure 101:

hostname Router-4
!
ip routing
!
! Define the MPOA client (mpc-2) configuration.
!
mpoa client config name mpc-2
!
! Configure the Token Ring interface
!
interface TokenRing1/0
 ip address 4.4.4.1 255.255.255.0
 ring-speed 16
!
! Configure the signalling and ILMI PVCs and attach the MPOA
! client to its ATM interface.
!
interface ATM2/0
 atm pvc 1 0 5 qsaal
 atm pvc 2 0 16 ilmi
 mpoa client name mpc-2
!
! Configure a Token Ring LANE client on ELAN 3 and bind the LANE
! client to its MPOA client (mpc-2). 
!
interface ATM2/0.1 multipoint
 ip address 3.3.3.2 255.255.255.0
 lane client mpoa client name mpc-2
 lane client tokenring 3
!
router eigrp 1
 network 3.0.0.0
 network 4.0.0.0
!
end

MPOA Token Ring LANE Configuration in an IP SRB-Routed Domain Example

Figure 102 illustrates MPOA in a Token Ring LANE environment where MPC-to-MPC shortcuts are established between a Token Ring LANE edge device and a Token Ring LANE router that reside in an IP SRB domain and IP-routed domains.

Figure 102 Token Ring MPOA—MPC to MPC Shortcut in an IP SRB-Routed Environment

The following commands show a sample configuration for Router-1 in Figure 102:

hostname Router-1
!
ip routing
!
! Configure the config-server database mpoa-db with configuration
! for ELANs 1 to 3
lane database mpoa-db
  name 1 server-atm-address 47.0091810000000060705BFA01.00000CA05F41.01
  name 1 local-seg-id 1000
  name 1 elan-id 100
  name 2 server-atm-address 47.0091810000000060705BFA01.00000CA05B41.01
  name 2 local-seg-id 2000
  name 2 elan-id 200
  name 3 server-atm-address 47.0091810000000060705BFA01.00000CA05B41.03
  name 3 local-seg-id 3000
  name 3 elan-id 300
!
! Define the MPOA Server (mps-1) configuration.
mpoa server config name mps-1
!
! Configure the signalling and ILMI PVCs. Also configure a config-server
! and attach the MPOA server (mps-1) to its ATM interface.
interface ATM4/0
  no ip address
  atm pvc 1 0 5 qsaal
  atm pvc 2 0 16 ilmi
  lane config auto-config-atm-address
  lane config database mpoa-db
  mpoa server name mps-1 
!
! Configure a Token Ring LANE client on ELAN 1 and bind the LANE
! client to its MPOA server (mps-1). The multiring ip configuration
! is required to terminate the RIF for IP packets on the ELAN.
interface ATM4/0.1 multipoint
  ip address 1.1.1.2 255.255.255.0
  lane client mpoa server name mps-1
  lane client tokenring 1
  multiring ip
!
! Configure a Token Ring LANE client on ELAN 2 and bind the LANE
! client to its MPOA server (mps-1)
!
 interface ATM4/0.2 multipoint
   ip address 2.2.2.1 255.255.255.0
   lane client mpoa server name mps-1
   lane client tokenring 2
!
!
 router eigrp 1
   network 1.0.0.0
   network 2.0.0.0
!
end

The following commands show a sample configuration for Router-2 in Figure 102:

hostname Router-2
!
ip routing
!
! Defines the MPOA Server (mps-2) configuration.
mpoa server config name mps-2
!
!
! Configure the signalling and ILMI PVCs and attach the MPOA
! server (mps-2) to its ATM interface.
interface ATM2/0
 no ip address
 atm pvc 1 0 5 qsaal
 atm pvc 2 0 16 ilmi
 mpoa server name mps-2
!
! Configure a Token Ring LANE client and LANE server-bus on ELAN 2
! and bind the LANE client to its MPOA server (mps-2)
!
interface ATM2/0.1 multipoint
 ip address 2.2.2.2 255.255.255.0
 lane server-bus tokenring 2
 lane client mpoa server name mps-2
 lane client tokenring 2
!
! Configure a Token Ring LANE client on ELAN 3 and bind the LANE
! client to its MPOA server (mps-2)
!
interface ATM2/0.3 multipoint
 ip address 3.3.3.1 255.255.255.0
 lane server-bus tokenring 3
 lane client mpoa server name mps-2
 lane client tokenring 3
!
router eigrp 1
 network 2.0.0.0
 network 3.0.0.0
!
end

The following commands show a sample configuration for Router-3 in Figure 102:

hostname Router-3
!
ip routing
!
! Define the MPOA client (mpc-2) configuration.
mpoa client config name mpc-2
!
!
! Configure the Token Ring interface
interface TokenRing1/0
 ip address 4.4.4.1 255.255.255.0
 ring-speed 16
!
! Configure the signalling and ILMI PVCs and attach the MPOA
! client to its ATM interface.
!
interface ATM2/0
 atm pvc 1 0 5 qsaal
 atm pvc 2 0 16 ilmi
 mpoa client name mpc-2
!
! Configure a Token Ring LANE client on ELAN 3 and bind the LANE
! client to its MPOA client (mpc-2).
! 
interface ATM2/0.1 multipoint
 ip address 3.3.3.2 255.255.255.0
 lane client mpoa client name mpc-2
 lane client tokenring 3
!
router eigrp 1
 network 3.0.0.0
 network 4.0.0.0
!
end