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Configuration Guide - IP Unicast Routing

S7700 and S9700 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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Configuring Attributes for CSNPs

Configuring Attributes for CSNPs


Complete sequence number PDUs (CSNPs) contain the summary of all the LSPs in an LSDB to ensure LSDB synchronization between neighbors. CSNPs are processed differently on broadcast and P2P links.
  • On a broadcast link, CSNPs are periodically sent by a DIS device. If a device detects that its LSDB is not synchronized with its neighbors', the device will send PSNPs to apply for missing LSPs.

  • On a P2P link, CSNPs are sent only during initial establishment of neighboring relationships.


  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 isis timer csnp csnp-interval [ level-1 | level-2 ]

    The interval at which CSNPs are sent is set on the interface.

    By default, the interval is 10 seconds.


    Configure Level-1 and Level-2 only when a broadcast interface is specified.

Updated: 2019-04-01

Document ID: EDOC1000178324

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