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Configuration Guide - IP Unicast Routing

S7700 and S9700 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 Advertise a Default Route

Configuring IS-IS to Advertise a Default Route

Context

If IS-IS is configured to advertise a default route on a border device that has external routes, the device advertises a default route 0.0.0.0/0 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.

Procedure

  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.

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Updated: 2019-04-01

Document ID: EDOC1000178324

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