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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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Example for Configuring IS-IS DIS Election

Example for Configuring IS-IS DIS Election

Networking Requirements

As shown in Figure 7-36, four routers on the broadcast network communicate using IS-IS. RouterA and RouterB are Level-1-2 routers, RouterC is a Level-1 router, and RouterD is a Level-2 router. RouterA with high performance needs to be configured as a Level-2 DIS.

Figure 7-36 Networking diagram of configuring IS-IS DIS election

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure IS-IS to enable network interconnectivity.

  2. Configure the DIS priority of RouterA to 100 so that RouterA can be elected as a Level-2 DIS.

Procedure

  1. Configure IP addresses for interfaces on each router.

    # Configure RouterA.

    <Huawei> system-view
    [Huawei] sysname RouterA
    [RouterA] interface gigabitethernet 1/0/0
    [RouterA-GigabitEthernet1/0/0] ip address 10.1.1.1 24
    [RouterA-GigabitEthernet1/0/0] quit

    The configurations of RouterB, RouterC, and RouterD are similar to the configuration of RouterA, and are not mentioned here.

  2. View the MAC address of the GE interface on each router.

    # View the MAC address of GigabitEthernet1/0/0 on RouterA.

    [RouterA] display arp interface gigabitethernet 1/0/0
    IP ADDRESS      MAC ADDRESS  EXPIRE(M) TYPE        INTERFACE      VPN-INSTANCE
                                           VLAN/CEVLAN PVC
    -------------------------------------------------------------------------
    10.1.1.1        00e0-fc10-afec         I -         GE1/0/0
    -------------------------------------------------------------------------
    Total:1        Dynamic:0       Static:0    Interface:1  

    # View the MAC address of GigabitEthernet1/0/0 on RouterB.

    [RouterB] display arp interface gigabitethernet 1/0/0
    IP ADDRESS      MAC ADDRESS  EXPIRE(M) TYPE        INTERFACE      VPN-INSTANCE
                                           VLAN/CEVLAN PVC
    -------------------------------------------------------------------------
    10.1.1.2        00e0-fccd-acdf         I -         GE1/0/0
    -------------------------------------------------------------------------
    Total:1        Dynamic:0       Static:0    Interface:1

    # View the MAC address of GigabitEthernet1/0/0 on RouterC.

    [RouterC] display arp interface gigabitethernet 1/0/0
    IP ADDRESS      MAC ADDRESS  EXPIRE(M) TYPE        INTERFACE      VPN-INSTANCE
                                           VLAN/CEVLAN PVC
    -------------------------------------------------------------------------
    10.1.1.3        00e0-fc50-25fe         I -         GE1/0/0
    -------------------------------------------------------------------------
    Total:1        Dynamic:0       Static:0    Interface:1

    # View the MAC address of GigabitEthernet1/0/0 on RouterD.

    [RouterD] display arp interface gigabitethernet 1/0/0
    IP ADDRESS      MAC ADDRESS  EXPIRE(M) TYPE        INTERFACE      VPN-INSTANCE
                                           VLAN/CEVLAN PVC
    -------------------------------------------------------------------------
    10.1.1.4        00e0-fcfd-305c         I -         GE1/0/0
    -------------------------------------------------------------------------
    Total:1        Dynamic:0       Static:0    Interface:1

  3. Enable IS-IS

    # Configure RouterA.

    [RouterA] isis 1
    [RouterA-isis-1] network-entity 10.0000.0000.0001.00
    [RouterA-isis-1] quit
    [RouterA] interface gigabitethernet 1/0/0
    [RouterA-GigabitEthernet1/0/0] isis enable 1
    [RouterA-GigabitEthernet1/0/0] quit

    # Configure RouterB.

    [RouterB] isis 1
    [RouterB-isis-1] network-entity 10.0000.0000.0002.00
    [RouterB-isis-1] quit
    [RouterB] interface gigabitethernet 1/0/0
    [RouterB-GigabitEthernet1/0/0] isis enable 1
    [RouterB-GigabitEthernet1/0/0] quit

    # Configure RouterC.

    [RouterC] isis 1
    [RouterC-isis-1] network-entity 10.0000.0000.0003.00
    [RouterC-isis-1] is-level level-1
    [RouterC-isis-1] quit
    [RouterC] interface gigabitethernet 1/0/0
    [RouterC-GigabitEthernet1/0/0] isis enable 1
    [RouterC-GigabitEthernet1/0/0] quit

    # Configure RouterD.

    [RouterD] isis 1
    [RouterD-isis-1] network-entity 10.0000.0000.0004.00
    [RouterD-isis-1] is-level level-2
    [RouterD-isis-1] quit
    [RouterD] interface gigabitethernet 1/0/0
    [RouterD-GigabitEthernet1/0/0] isis enable 1
    [RouterD-GigabitEthernet1/0/0] quit

    # View IS-IS neighbor information on RouterA.

    [RouterA] display isis peer
    
    
                              Peer information for ISIS(1)
                              ----------------------------
      System Id    Interface         Circuit Id        State  HoldTime Type     PRI
      -----------------------------------------------------------------------------
    0000.0000.0002 GE1/0/0           0000.0000.0002.01  Up    9s       L1(L1L2) 64
    0000.0000.0003 GE1/0/0           0000.0000.0002.01  Up    27s      L1       64
    0000.0000.0002 GE1/0/0           0000.0000.0004.01  Up    28s      L2(L1L2) 64
    0000.0000.0004 GE1/0/0           0000.0000.0004.01  Up    8s       L2       64
    
    Total Peer(s): 4
    

    # View IS-IS interface information on RouterA.

    [RouterA] display isis interface
    
    
                           Interface information for ISIS(1)
                           ---------------------------------
     Interface       Id      IPV4.State          IPV6.State      MTU  Type  DIS
     GE1/0/0         001         Up                 Down         1497 L1/L2 No/No

    # View IS-IS interface information on RouterB.

    [RouterB] display isis interface
    
    
                           Interface information for ISIS(1)
                           ---------------------------------
     Interface       Id      IPV4.State          IPV6.State      MTU  Type  DIS
     GE1/0/0         001         Up                 Down         1497 L1/L2 Yes/No

    # View IS-IS interface information on RouterD.

    [RouterD] display isis interface
    
    
                           Interface information for ISIS(1)
                           ---------------------------------
     Interface       Id      IPV4.State          IPV6.State      MTU  Type  DIS
     GE1/0/0         001         Up                 Down         1497  L2   No/Yes
    NOTE:

    As shown in the preceding interface information, when the default DIS priority is used, the IS-IS interface on RouterB has the largest MAC address among all the interfaces on the Level-1 routers. Therefore, RouterB is elected as the Level-1 DIS. The IS-IS interface on RouterD has the largest MAC address among all the interfaces on Level-2 routers. Therefore, RouterD is elected as the Level-2 DIS. Level-1 and Level-2 pseudonodes are 0000.0000.0002.01 and 0000.0000.0004.01 respectively.

  4. Set the DIS priority of RouterA.

    [RouterA] interface gigabitethernet 1/0/0
    [RouterA-GigabitEthernet1/0/0] isis dis-priority 100

    # View IS-IS neighbor information on RouterA.

    [RouterA] display isis peer
    
    
                              Peer information for ISIS(1)
                              ----------------------------
      System Id    Interface         Circuit Id        State  HoldTime Type     PRI
      -----------------------------------------------------------------------------
    0000.0000.0002 GE1/0/0           0000.0000.0001.01  Up    21s      L1(L1L2) 64
    0000.0000.0003 GE1/0/0           0000.0000.0001.01  Up    27s      L1       64
    0000.0000.0002 GE1/0/0           0000.0000.0001.01  Up    28s      L2(L1L2) 64
    0000.0000.0004 GE1/0/0           0000.0000.0001.01  Up    30s      L2       64
    
    Total Peer(s): 4
    

  5. Verify the configuration.

    # View IS-IS interface information on RouterA.

    [RouterA] display isis interface
    
    
                           Interface information for ISIS(1)
                           ---------------------------------
     Interface       Id      IPV4.State          IPV6.State      MTU  Type  DIS
     GE1/0/0         001         Up                 Down         1497 L1/L2 Yes/Yes
    NOTE:

    As shown in the preceding information, after the DIS priority of the IS-IS interface is changed, RouterA becomes a Level-1-2 DIS (DR) immediately and its pseudonode is 0000.0000.0001.01.

    # View IS-IS neighbor and interface information on RouterB.

    [RouterB] display isis peer
    
    
                              Peer information for ISIS(1)
                              ----------------------------
      System Id    Interface          Circuit Id       State  HoldTime Type     PRI
      -----------------------------------------------------------------------------
    0000.0000.0001 GE1/0/0            0000.0000.0001.01 Up    7s       L1(L1L2) 100
    0000.0000.0003 GE1/0/0            0000.0000.0001.01 Up    25s      L1       64
    0000.0000.0001 GE1/0/0            0000.0000.0001.01 Up    7s       L2(L1L2) 100
    0000.0000.0004 GE1/0/0            0000.0000.0001.01 Up    25s      L2       64
    
    Total Peer(s): 4
    
     [RouterB] display isis interface
    
    
                           Interface information for ISIS(1)
                           ---------------------------------
     Interface       Id      IPV4.State          IPV6.State      MTU  Type  DIS
     GE1/0/0         001         Up                 Down         1497 L1/L2 No/No

    # View IS-IS neighbor and interface information on RouterD.

    [RouterD] display isis peer
    
    
                              Peer information for ISIS(1)
                              ----------------------------
      System Id    Interface          Circuit Id       State  HoldTime Type     PRI
      -----------------------------------------------------------------------------
    0000.0000.0001 GE1/0/0            0000.0000.0001.01 Up    9s       L2       100
    0000.0000.0002 GE1/0/0            0000.0000.0001.01 Up    28s      L2       64
    
    Total Peer(s): 2
    
    [RouterD] display isis interface
                           Interface information for ISIS(1)
                           ---------------------------------
     Interface       Id      IPV4.State          IPV6.State      MTU  Type  DIS
     GE1/0/0         001         Up                 Down         1497 L1/L2 No/No

Configuration Files

  • Configuration file of RouterA

    #
     sysname RouterA
    #
    isis 1
     network-entity 10.0000.0000.0001.00
    #
    interface GigabitEthernet1/0/0
     ip address 10.1.1.1 255.255.255.0
     isis enable 1
     isis dis-priority 100
    #
    return
  • Configuration file of RouterB

    #
     sysname RouterB
    #
    isis 1
     network-entity 10.0000.0000.0002.00
    #
    interface GigabitEthernet1/0/0
     ip address 10.1.1.2 255.255.255.0
     isis enable 1
    #
    return
  • Configuration file of RouterC

    #
     sysname RouterC
    #
    isis 1
     is-level level-1
     network-entity 10.0000.0000.0003.00
    #
    interface GigabitEthernet1/0/0
     ip address 10.1.1.3 255.255.255.0
     isis enable 1
    #
    return
  • Configuration file of RouterD

    #
     sysname RouterD
    #
    isis 1
     is-level level-2
     network-entity 10.0000.0000.0004.00
    #
    interface GigabitEthernet1/0/0
     ip address 10.1.1.4 255.255.255.0
     isis enable 1
    #
    return
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Updated: 2019-05-20

Document ID: EDOC1100034072

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