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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 Route Summarization

Configuring IS-IS Route Summarization

A large IS-IS network has a large number of routing entries. This will slow down routing table lookup and increase management complexity. You can configure route summarization to reduce the size of routing tables.

Pre-configuration Tasks

Before configuring IS-IS route summarization, complete the following task:


  1. Run system-view

    The system view is displayed.

  2. Run isis [ process-id ]

    The IS-IS view is displayed.

  3. Run summary ip-address mask [ avoid-feedback | generate_null0_route | tag tag | [ level-1 | level-1-2 | level-2 ] ] *

    The specified IS-IS routes are summarized into one IS-IS route.

    After route summarization is configured on a device, the local routing table still contains all specific routes before the summarization. The routing tables on other devices contain only the summary route, and the summary route is deleted only after all its specific routes are deleted.

Verifying the Configuration

  • Run the display isis route command to check summary routes in the IS-IS routing table.

  • Run the display ip routing-table [ verbose ] command to check summary routes in the IP routing table.

Updated: 2019-12-27

Document ID: EDOC1000174069

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