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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

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, and PBR.

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Setting the Interval for Receiving LSAs

Setting the Interval for Receiving LSAs

Context

In OSPF, the interval for receiving LSAs is defined as 1s. This aims to prevent network connections or frequent route flapping from consuming excessive network bandwidth or device resources.

On a stable network where routes need to fast converge, you can cancel the interval for receiving LSAs by setting the interval to 0s. In this manner, changes of the topology or the routes can be immediately advertised on the network through LSAs, thereby speeding up route convergence on the network.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run lsa-arrival-interval { interval | intelligent-timer max-interval start-interval hold-interval }

    The interval for receiving LSAs is set.

    • The parameter interval specifies the interval for receiving LSAs, in seconds.
    • The parameter intelligent-timer indicates that an intelligent timer is used to set the interval for receiving router LSAs or network LSAs.
    • The parameter max-interval specifies the maximum interval for receiving LSAs, in milliseconds.
    • The parameter start-interval specifies the initial interval for receiving LSAs, in milliseconds.
    • The parameter hold-interval specifies the hold interval for receiving LSAs, in milliseconds.

    On a stable network where routes need to fast converge, you can set the interval for receiving LSAs to 0s so that changes of the topology or the routes can be detected immediately.

    By default, an intelligent timer is enabled. After an intelligent timer is enabled, the default maximum interval for receiving LSAs is 1000 ms, the default initial interval is 500 ms, and the default hold interval is 500 ms. The mechanism of the intelligent timer is as follows:
    1. The initial interval for receiving LSAs is specified by start-interval.
    2. The interval for the nth (n ≥ 2) LSA receipt 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 uses the maximum interval to receive LSAs.
    4. If no flapping occurs within the interval specified by max-interval that starts upon the end of the last LSA receipt, the intelligent timer exits.

    5. If no flapping occurs in the last interval but flapping occurs in the current interval, the LSA receipt is delayed for a period specified by start-interval. After LSA receipt is complete, the current interval is used for the next LSA receipt.

  4. (Optional) Run lsa-arrival-interval suppress-flapping suppress-interval [ threshold threshold ]

    The maximum LSA suppression period is configured.

    If frequent LSA flapping occurs, the larger value between lsa-arrival-interval suppress-flapping and lsa-arrival-interval is used as the value of the suppression timer.

    By default, if a device receives an LSA, it delays route calculation for 10s in route flapping scenarios.

  5. Run commit

    The configuration is committed.

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Updated: 2019-03-21

Document ID: EDOC1000166601

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