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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R010C00

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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Setting an Interval at Which LSAs Are Updated

Setting an Interval at Which LSAs Are Updated


OSPF stipulates that LSAs are updated at an interval of 5s with an aim to prevent network connections or frequent route flapping from consuming excessive network bandwidth or device resources.

On a stable network where routes need to be fast converged, set the interval at which LSAs are updated to 0 seconds. Changes to the topology or the routes are then immediately advertised on the network through LSAs, thereby speeding up route convergence.


  1. Run:


    The system view is displayed.

  2. Run:

    ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run:

    lsa-originate-interval { 0 | { intelligent-timer max-interval start-interval hold-interval | other-type interval } * }

    An interval at which LSAs are updated is set.

    • The parameter intelligent-timer indicates that an interval at which router LSAs and network LSAs are updated is set through an intelligent timer.
    • The parameter max-interval specifies the maximum interval at which LSAs are updated, in milliseconds.
    • The parameter start-interval specifies the initial interval at which LSAs are updated, in milliseconds.
    • The parameter hold-interval specifies the hold interval at which LSAs are updated, in milliseconds.
    • The parameter other-type interval indicates an interval at which LSAs other than Router LSAs and Network LSAs are updated.
    By default, an intelligent timer is enabled. After an intelligent timer is enabled, the default maximum interval for updating LSAs is 5000 ms, the default initial interval is 500 ms, and the default hold interval is 1000 ms. Details about the interval for updating LSAs are as follows:
    1. The initial interval for updating LSAs is specified by start-interval.
    2. The interval for updating LSAs for the nth (n ≥ 2) time is equal to hold-interval x 2(n-2).
    3. When the interval specified by hold-interval x 2(n-2) reaches the maximum interval specified by max-interval, OSPF updates LSAs at the maximum interval three consecutive times. Then, OSPF repeats step 3.a and updates LSAs at the initial interval specified by start-interval.

Updated: 2019-08-21

Document ID: EDOC1000141900

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