Configuring Token Ring LAN Emulation MPOA

This chapter describes the required and optional tasks for configuring the Multiprotocol over ATM (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.

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.

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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

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:

SUMMARY STEPS

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

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

    3.    Router(config-if)# lane client mpoa servermps-name

    4.    Router(config-if)# lane client mpoa clientmpc-name


DETAILED STEPS
     Command or ActionPurpose
    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 servermps-name  

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

     
    Step 4 Router(config-if)# lane client mpoa clientmpc-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:

    SUMMARY STEPS

      1.    Router(config)# lane databasedatabase-name

      2.    Router(lane-config-dat)# nameelan-nameserver-atm-addressatm-address

      3.    Router(lane-config-dat)# nameelan-nameelan-idid

      4.    Router(lane-config-dat)# nameelan-name local-seg-idid


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 Router(config)# lane databasedatabase-name  

      Creates a named database for the LECS.

       
      Step 2 Router(lane-config-dat)# nameelan-nameserver-atm-addressatm-address  

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

       
      Step 3 Router(lane-config-dat)# nameelan-nameelan-idid  

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

       
      Step 4 Router(lane-config-dat)# nameelan-name local-seg-idid  

      Configures the local segment ID number.

       

      Configuring the LES BUS

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

      SUMMARY STEPS

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

        2.    Router(config-if)# lane server-bus tokenringelan-name [elan-idelan-id ]


      DETAILED STEPS
         Command or ActionPurpose
        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 tokenringelan-name [elan-idelan-id ] 

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

         

        Token Ring LANE Configuration Examples

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

        The figure below 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 1. Token Ring MPOA--MPC to MPC Shortcut in an IP Routed Environment

        The following commands show a sample configuration for Router-1 in the figure: 

        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 the figure: 

        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 the figure: 

        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 the figure: 

        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

        The figure below 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 2. Token Ring MPOA--MPC to MPC Shortcut in an IP SRB-Routed Environment

        The following commands show a sample configuration for Router-1 in the figure: 

        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 the figure: 

        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 the figure: 

        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