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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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Configuring IS-IS to Import External Routes

Configuring IS-IS to Import External Routes

Context

After IS-IS is configured to advertise a default route on a border device in an IS-IS routing domain, all the traffic destined outside the IS-IS routing domain is forwarded through the border device. This burdens the border device because other devices in the IS-IS routing domain do not have the routes destined outside the domain. If multiple border devices are deployed in the IS-IS routing domain, optimal routes to other routing domains need to be selected.

To ensure optimal routes are selected, all the other devices in the IS-IS routing domain must learn all or some external routes.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run isis [ process-id ]

    The IS-IS view is displayed.

  3. Configure IS-IS to import external routes.

    • When you need to set the cost of imported routes, run the ipv6 import-route { static | direct | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp [ permit-ibgp ] } [ cost cost | tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * command to configure IS-IS to import external IPv6 routes.
    • When you need to retain the original cost of imported routes, run the ipv6 import-route { direct | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp [ permit-ibgp ] } inherit-cost [ tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * command to configure IS-IS to import external IPv6 routes. In this case, the source routing protocol of imported routes cannot be static.
    NOTE:

    IS-IS will advertise all imported external routes to the IS-IS routing domain by default.

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Updated: 2019-05-17

Document ID: EDOC1000174069

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