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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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Enabling the Replay Protection Function

Enabling the Replay Protection Function

Context

If an interface goes Down and then goes Up, RIP routing information on both ends of a link may be desynchronized or lost. Specifically, if the Identification field in the last RIP packet sent before a RIP interface goes Down is X, after the interface goes Up, the Identification field in the subsequent RIP packet sent by this interface becomes 0. If the peer end does not receive the RIP packet with the Identification field being 0, the peer end discards subsequent RIP packets until it receives the RIP packet with the Identification field being X+1. This leads to RIP routing information on both ends of the link being desynchronized or lost.

To solve this problem, enable the replay protection function so that RIP can obtain the Identification field in the last RIP packet sent before the RIP interface goes Down and increase the Identification field in the subsequent RIP packet by 1.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

  4. Run:

    rip authentication-mode md5 nonstandard password-key key-id

    RIP-2 is configured to use MD5 authentication, and authentication packets use the nonstandard packet format.

  5. Run:

    rip replay-protect

    The replay protection function is enabled.

    NOTE:

    If you run the rip replay-protect command in the same view multiple times, only the latest configuration takes effect.

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Updated: 2019-08-21

Document ID: EDOC1000141900

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