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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R013C00

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, IP Routing Table Management, and PBR.
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Setting a Dead Time for a Neighbor Relationship

Setting a Dead Time for a Neighbor Relationship


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The OSPF 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 ospf timer dead interval

    A dead time after which the neighbor relationship expires between two switches is set.

    By default, the dead time is 40s on a P2P or broadcast interface, and 120s on a P2MP or NBMA interface. The dead time is four times the interval for sending Hello packets on the same interface.


    A dead time longer than 20s is recommended. If the dead time is shorter than 20s, the OSPF neighbor relationship may be disconnected unexpectedly.

    Both the Hello timer (interval for sending Hello packets) and the Dead timer (interval after which a neighbor relationship expires) are restored to their default values upon a change of the network type.

Updated: 2019-04-08

Document ID: EDOC1100065744

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