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Configuration Guide - IP Unicast Routing

S9300, S9300E, and S9300X 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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Setting an Interval for SPF Calculation

Setting an Interval for SPF Calculation

Context

When an OSPF LSDB changes, the shortest path must be recalculated. If a network changes frequently and the shortest path is continually recalculated, system resources are heavily consumed, degrading network performance. To prevent this situation from occurring, configure an intelligent timer and set a correct interval for the SPF calculation.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run spf-schedule-interval { interval1 | intelligent-timer max-interval start-interval hold-interval | millisecond interval2 }

    An interval for the SPF calculation is set.

    • The parameter interval1 specifies an interval for the SPF calculation, in seconds.
    • The parameter intelligent-timer indicates that an interval for the SPF calculation is set through an intelligent timer.
    • The parameter max-interval specifies the maximum interval for the SPF calculation, in milliseconds.
    • The parameter start-interval specifies the initial interval for the SPF calculation, in milliseconds.
    • The parameter hold-interval specifies the hold interval for the SPF calculation, in milliseconds.
    • The parameter millisecond interval2 specifies an interval for the SPF calculation, in milliseconds.

    By default, an intelligent timer is enabled. After an intelligent timer is enabled, the default maximum interval for the SPF calculation is 10000 ms, the initial interval is 500 ms, and the hold interval is 1000 ms. Details about the interval for the SPF calculation are as follows:

    1. The initial interval for the SPF calculation is specified by the parameter start-interval.

    2. The interval for the SPF calculation 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 performs the SPF calculation at the maximum interval for three consecutive times. Then, OSPF repeats step 3.a and performs the SPF calculation at the initial interval specified by start-interval.

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Updated: 2019-10-22

Document ID: EDOC1000178418

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