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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R013C00

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, IP Routing Table Management, and PBR.
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(Optional) Restricting the Flooding of LSA Packets

(Optional) Restricting the Flooding of LSA Packets


If there are multiple neighboring switches or a large number of LSA packets are flooded, a neighboring switch may be inundated with LSA packets and become overwhelmed processing them. This may cause the neighboring switch to discard Hello packets that are used to maintain the OSPF neighbor relationships, resulting in interruptions to the neighbor relationships. More packets need to be exchanged to reestablish the neighbor relationships, which further increases the possibility of neighbor relationship interruptions. To resolve this problem, you can restrict the flooding of LSA packets.

Perform the following steps on a switch 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 packets is restricted.

    By default, 50 LSA packets can be flooded at an interval of 30s.

    The flooding-control command takes effect immediately after execution.

    If the flooding-control command is not run, flooding of LSA packets is automatically restricted when the number of neighboring switches exceeds 256.

Updated: 2019-04-08

Document ID: EDOC1100065744

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