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Configuration Guide - VPN

S7700 and S9700 V200R013C00

This document describes the configurations of VPN, including GRE, IPSec, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, VPLS, L2VPN Access to L3VPN.
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(Optional) Configuring a Period for an AC Interface to Restore a Blocked Interface

(Optional) Configuring a Period for an AC Interface to Restore a Blocked Interface


After an AC interface enabled with L2VPN loop detection detects a loop, a period can be specified for the AC interface to restore a blocked interface. That is, if a blocked interface does not receive any L2VPN loop detection packet within the period specified by recovery-time, it will be restored to normal state.

If a device is on multiple loops, interfaces on the device may alternate between blocked and normal states during the initial detection stage. To prevent interface status flapping, you are advised to set recovery-time to a larger value.

Perform the following operations on the PE.


  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 loop-detect recovery-time recovery-time

    A period is configured for an AC interface to restore a blocked interface.

    By default, an AC interface restores a blocked interface every 15 seconds.

Updated: 2019-04-08

Document ID: EDOC1100065751

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