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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

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Configuring IS-IS to Advertise a Default Route

Configuring IS-IS to Advertise a Default Route


If IS-IS is configured to advertise a default route on a border device that has external routes, the device advertises a default route ::/0 in the IS-IS routing domain. All traffic destined for other routing domains is first forwarded to the border device.

Configuring a static default route can also allow all the traffic to be first forwarded to a border device, which then forwards the traffic outside an IS-IS routing domain. However, this method leads to heavy workload in configuration and management when a large number of devices are deployed on the network.

In addition, advertising default routes using IS-IS is flexible. If multiple border devices are deployed, a routing policy can be configured to allow only the border device that meets the specified conditions to advertise a default route, preventing routing blackholes.


  1. Run system-view

    The system view is displayed.

  2. Run isis [ process-id ]

    The IS-IS view is displayed.

  3. Run ipv6 default-route-advertise [ always | match default | route-policy route-policy-name ] [ cost cost | tag tag | [ level-1 | level-1-2 | level-2 ] ] * [ avoid-learning ]

    IS-IS is configured to advertise a default IPv6 route.

    By default, IS-IS does not advertise a default route.

  4. Run commit

    The configuration is committed.

Updated: 2019-03-21

Document ID: EDOC1000166601

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