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Configuration Guide - IP Unicast Routing

S1720, S2700, S5700, and S6720 V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.
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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 import-route { { rip | isis | ospf } [ process-id ] | static | direct | unr | bgp [ permit-ibgp ] } [ cost-type { external | internal } | cost cost | tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * command to configure IS-IS to import external routes.
    • When you need to retain the original cost of imported routes, run the import-route { { rip | isis | ospf } [ process-id ] | direct | unr | bgp } inherit-cost [ tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * command to configure IS-IS to import external 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: 2019-10-21

Document ID: EDOC1000178171

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