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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Example for Configuring IS-IS Route Leaking

Example for Configuring IS-IS Route Leaking

Networking Requirements

As shown in Figure 7-34, IS-IS is configured on six routers. RouterA and RouterB are Level-1 routers, and RouterC and RouterD are Level-1-2 routers. They belong to area 10. RouterE and RouterF are Level-2 routers and belong to area 20. The cost of other interfaces except GE1/0/0 on RouterC (its cost is 40) is 10. Routes need to be leaked from Level-2 area to Level-1 area so that the router from RouterA to RouterF becomes the optimal route.

Figure 7-34 Networking diagram of configuring IS-IS route leaking

Configuration Roadmap

The configuration roadmap is as follows:
  • Configure IP addresses for interfaces and enable IS-IS on each router so that the routers can be interconnected.
  • Configure RouterA and RouterB are Level-1 routers, and RouterC and RouterD are Level-1-2 routers. They belong to area 10. RouterE and RouterF are Level-2 routers and belong to area 20.
  • Configure the cost of other interfaces except GE1/0/0 on RouterC (its cost is 40) is 10.
  • Configure routes to be leaked from Level-2 area to Level-1 area so that the router from RouterA to RouterF becomes the optimal route.

Procedure

  1. Configure IP addresses for interfaces on each router.

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

    <Huawei> system-view
[Huawei] sysname RouterA
[RouterA] interface gigabitethernet 1/0/0
[RouterA-GigabitEthernet1/0/0] ip address 192.168.1.1 24
[RouterA-GigabitEthernet1/0/0] quit

  2. Configure basic IS-IS functions.

    # Configure RouterA.

    [RouterA] isis 10
[RouterA-isis-10] is-level level-1
[RouterA-isis-10] network-entity 10.0000.0000.0001.00
[RouterA-isis-10] quit
[RouterA] interface gigabitethernet 1/0/0
[RouterA-GigabitEthernet1/0/0] isis enable 10
[RouterA-GigabitEthernet1/0/0] quit

    # Configure RouterB.

    [RouterB] isis 10
[RouterB-isis-10] is-level level-1
[RouterB-isis-10] network-entity 10.0000.0000.0002.00
[RouterB-isis-10] quit
[RouterB] interface gigabitethernet 1/0/0
[RouterB-GigabitEthernet1/0/0] isis enable 10
[RouterB-GigabitEthernet1/0/0] quit

    # Configure RouterC.

    [RouterC] isis 10
[RouterC-isis-10] network-entity 10.0000.0000.0003.00
[RouterC-isis-10] quit
[RouterC] interface gigabitethernet 1/0/0
[RouterC-GigabitEthernet1/0/0] isis enable 10
[RouterC-GigabitEthernet1/0/0] isis cost 40 level-2
[RouterC-GigabitEthernet1/0/0] quit

    # Configure RouterD.

    [RouterD] isis 10
[RouterD-isis-10] network-entity 10.0000.0000.0004.00
[RouterD-isis-10] quit
[RouterD] interface gigabitethernet 1/0/0
[RouterD-GigabitEthernet1/0/0] isis enable 10
[RouterD-GigabitEthernet1/0/0] quit

    # Configure RouterE.

    [RouterE] isis 10
[RouterE-isis-10] is-level level-2
[RouterE-isis-10] network-entity 20.0000.0000.0005.00
[RouterE-isis-10] quit
[RouterE] interface gigabitethernet 1/0/0
[RouterE-GigabitEthernet1/0/0] isis enable 10
[RouterE-GigabitEthernet1/0/0] quit

    # Configure RouterF.

    [RouterF] isis 10
[RouterF-isis-10] is-level level-2
[RouterF-isis-10] network-entity 20.0000.0000.0006.00
[RouterF-isis-10] quit
[RouterF] interface gigabitethernet 1/0/0
[RouterF-GigabitEthernet1/0/0] isis enable 10
[RouterF-GigabitEthernet1/0/0] quit

    The configurations of GigabitEthernet 2/0/0, and GigabitEthernet 3/0/0 are similar to the configuration of GigabitEthernet 1/0/0, and are not mentioned here.

  3. Configure route leaking on RouterD. 

    [RouterD] isis 10
[RouterD-isis-10] import-route isis level-2 into level-1
[RouterD-isis-10] quit

  4. Verify the configuration.

    # Before configuring route leaking on RouterD, run the tracert 192.168.6.2 command on RouterA. The path from RouterA to RouterF is RouterA -> RouterC -> RouterE -> RouterF. The path cost is 60 (10+40+10).

    # After configuring route leaking on RouterD, run the tracert 192.168.6.2 command on RouterA. The path from RouterA to RouterF is RouterA -> RouterB -> RouterD -> RouterE -> RouterF. The path cost is +10 (10+10+10+10). The route from RouterA to RouterF becomes the optimal route.

Configuration Files

  • Configuration file of RouterA

    #
 sysname RouterA
#
isis 10
 is-level level-1
 network-entity 10.0000.0000.0001.00
#
interface GigabitEthernet1/0/0
 ip address 192.168.1.1 255.255.255.0
 isis enable 10
#
interface GigabitEthernet2/0/0
 ip address 192.168.2.1 255.255.255.0
 isis enable 10
#

  • Configuration file of RouterB

    #
 sysname RouterB
#
isis 10
 is-level level-1
 network-entity 10.0000.0000.0002.00
#
interface GigabitEthernet1/0/0
 ip address 192.168.1.2 255.255.255.0
 isis enable 10
#
interface GigabitEthernet2/0/0
 ip address 192.168.3.1 255.255.255.0
 isis enable 10
#

  • Configuration file of RouterC

    #
 sysname RouterC
#
isis 10
 network-entity 10.0000.0000.0003.00
#
interface GigabitEthernet1/0/0
 ip address 192.168.4.1 255.255.255.0
 isis enable 10
 isis cost 40 level-2
#
interface GigabitEthernet2/0/0
 ip address 192.168.2.2 255.255.255.0
 isis enable 10
#

  • Configuration file of RouterD

    #
 sysname RouterD
#
isis 10
 network-entity 10.0000.0000.0004.00
 import-route isis level-2 into level-1
#
interface GigabitEthernet1/0/0
 ip address 192.168.3.2 255.255.255.0
 isis enable 10
#
interface GigabitEthernet2/0/0
 ip address 192.168.5.1 255.255.255.0
 isis enable 10
#

  • Configuration file of RouterE

    #
 sysname RouterE
#
isis 10
 is-level level-2
 network-entity 20.0000.0000.0005.00
#
interface GigabitEthernet1/0/0
 ip address 192.168.4.2 255.255.255.0
 isis enable 10
#
interface GigabitEthernet2/0/0
 ip address 192.168.5.2 255.255.255.0
 isis enable 10
#
interface GigabitEthernet3/0/0
 ip address 192.168.6.1 255.255.255.0
 isis enable 10
#

  • Configuration file of RouterF

    #
 sysname RouterF
#
isis 10
 is-level level-2
 network-entity 20.0000.0000.0006.00
#
interface GigabitEthernet1/0/0
 ip address 192.168.6.2 255.255.255.0
 isis enable 10
#
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Updated: 2019-12-27

Document ID: EDOC1000174069

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