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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 OSPF Route Summarization

Configuring OSPF Route Summarization

Context

Route summarization on a large-scale OSPF network reduces the number of routing entries. This function minimizes system resource consumption while maintaining system performance. In addition, if a link frequently alternates between Up and Down, the links not involved in route summarization are not affected. This prevents route flapping and improves network stability.

When an ABR sends routing information to other areas, it creates Type 3 LSAs for each network segment. If there are routes with the same prefix in an area, run the abr-summary command to summarize these routes. The ABR then sends just one summarized LSA to other areas.

Perform the following steps on the switch running OSPF.

Procedure

  • Configure ABR route summarization.
    1. Run system-view

      The system view is displayed.

    2. Run ospf [ process-id ]

      The OSPF process view is displayed.

    3. Run area area-id

      The OSPF area view is displayed.

    4. Run abr-summary ip-address mask [ [ cost { cost | inherit-minimum } | [ advertise [ generate-null0-route ] | not-advertise | generate-null0-route [ advertise ] ] ] * ]

      ABR route summarization is configured.

  • Configure ASBR route summarization.
    1. Run system-view

      The system view is displayed.

    2. Run ospf [ process-id ]

      The OSPF process view is displayed.

    3. (Optional) Run asbr-summary type nssa-trans-type-reference [ cost nssa-trans-cost-reference ]

      OSPF is configured to consider Type 5 LSAs that are translated from Type 7 LSAs when types and costs for summary routes are set on ASBRs.

      If this command is not run, OSPF does not consider Type 5 LSAs that are translated from Type 7 LSAs when types and costs for summary routes are set on ASBRs.

    4. Run asbr-summary ip-address mask [ not-advertise | tag tag | cost cost | distribute-delay interval ] *

      ASBR route summarization is configured.

      NOTE:
      After route summarization is configured, the routing table on the local OSPF switch remains unchanged. However, the routing table on another OSPF switch contains only one summarized route. This summarized route is not removed unless all specific routes are interrupted.

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Updated: 2019-10-21

Document ID: EDOC1000178171

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