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CLI-based Configuration Guide - VPN

AR650, AR1600, and AR6100 V300R003

This document describes VPN features on the device and provides configuration procedures and configuration examples.
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Tunnel Interface Alternates Between Up and Down States

Tunnel Interface Alternates Between Up and Down States

Fault Description

After a GRE tunnel is configured, the tunnel interface alternates between Up and Down states.

Troubleshooting Procedure

Run the display fib destination-address command in any view multiple times to check whether the outbound interface in the FIB entry to the specified destination network segment changes. For example, the command outputs are displayed as follows:

<Huawei> display fib 10.2.1.0
  Route Entry Count: 1
Destination/Mask   Nexthop         Flag  TimeStamp     Interface      TunnelID
10.2.1.0/24        10.3.1.2        SU    t[631838]     Tun0/0/1       0x0
<Huawei> display fib 10.2.1.0
  Route Entry Count: 1
Destination/Mask   Nexthop         Flag  TimeStamp     Interface      TunnelID
10.2.1.0/24        1.1.1.2         GSU   t[631840]     GE1/0/0        0x0

The command outputs show that the outbound interface to 10.2.1.0 changes. As a result, the tunnel interface flaps.

If the outbound interface changes, adjust the network topology to ensure that the outbound interface is not a GRE tunnel interface.

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Updated: 2019-04-12

Document ID: EDOC1100041799

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