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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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(Optional) Restricting the Flooding of LSA Update Packets

(Optional) Restricting the Flooding of LSA Update Packets


When multiple neighboring routers are configured or a large number of LSA update packets are flooded, the neighboring router may receive a large number of LSA update packets in a short period. This keeps the neighboring router busy processing a burst of LSA update packets and causes the neighboring router to discard Hello packets that are used to maintain the OSPF neighbor relationships. As a result, the neighbor relationships are interrupted. After the neighbor relationships are reestablished, more packets will be exchanged. This increases the frequency of neighbor relationship interruption. To resolve this problem, you can restrict the flooding of LSA update packets to maintain neighbor relationships.

Perform the following steps on the router running OSPF.


  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run flooding-control [ number transmit-number | timer-interval transmit-interval ] *

    The flooding of LSA update packets is restricted.

    By default, the number of LSA update packets to be flooded each time is 50, and the interval at which LSA update packets are flooded is 30s.

    After the flooding-control command is run, the flooding of LSA update packets is immediately restricted.

    If the flooding-control command is not run, the function of restricting the flooding of LSA update packets automatically takes effect when the number of neighboring routers exceeds 256.

Updated: 2019-12-27

Document ID: EDOC1000174069

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