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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 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 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 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 route.

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

Updated: 2019-05-17

Document ID: EDOC1000174069

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