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CLI-based Configuration Guide - Reliability

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.
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Configuring Association Between Interface Backup in Active/Standby Mode and BFD

Configuring Association Between Interface Backup in Active/Standby Mode and BFD

Background

BFD provides fast fault detection independent of media and routing protocols. It can rapidly detect faults on the forwarding path between two adjacent routers. As shown in Figure 2-9, create a BFD session on RouterA and RouterB and configure association between interface backup and BFD on a backup interface of RouterA. By doing this, the BFD session detects connectivity of the primary link and services can be rapidly switched. When the BFD session detects that the primary link is working properly, the primary link transmits services. When the BFD session detects that the primary link is unreachable, BFD requests RouterA to start a backup interface to transmit services. When the BFD session detects that the original primary link is restored, BFD requests the interface module to switch services back to the primary link.

Figure 2-9  Networking diagram of association between interface backup and BFD

NOTE:

Assume that the primary and backup links use static routes. When the primary link is faulty, data traffic will be lost because routes cannot be switched immediately. To speed up data traffic switching, set the route priority of the backup link to be higher than that of the primary link or configure association between BFD and static routes. When the BFD session detects that the route on the primary link is unreachable, it deletes the static route corresponding to the primary link from the routing table. For details, see Configuring Static BFD for IPv4 Static Routes.

Pre-Configuration Tasks

Before configuring association between interface backup and BFD, complete the following tasks:

Procedure

  1. Run system-view

    The system view is displayed.

  2. (Optional) Run ip route-static ip-address { mask | mask-length } { nexthop-address | interface-type interface-number [ nexthop-address ] } [ preference preference | tag tag ] * track bfd-session cfg-name [ description text ]

    Association between the IPv4 static route of the primary link and a BFD session is configured or route priorities of the primary and backup links are set.

    NOTE:
    • If the primary and backup links use dynamic routes, skip 2.

    • If the primary and backup links use static routes, perform 2 to configure association between BFD and static routes or set the route of the backup link to have a higher priority than the route of the primary link.

  3. Run interface interface-type interface-number

    The view of the backup interface is displayed.

  4. Run standby track bfd-session session-name session-name

    Association between interface backup and BFD is configured.

    NOTE:
    A backup interface can associate with only one BFD session, while a BFD session can associate with multiple backup interfaces.

Checking the Configuration

After the configuration is complete, run the display standby state command to check the status of the BFD session and the backup interface.

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Updated: 2019-08-12

Document ID: EDOC1100034076

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