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NE40E V800R010C10SPC500 Configuration Guide - IP Routing 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Routing
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Configuring BGP4+ Auto FRR

Configuring BGP4+ Auto FRR

As a protection measure against link faults, BGP4+ Auto Fast Reroute (FRR) is applicable to the network topology with primary and backup links. BGP4+ Auto FRR is applicable to services that are very sensitive to packet loss and delays.

Usage Scenario

As networks evolve continuously, voice, on-line video, and financial services raise increasingly high requirements for real-time performance. Usually, primary and backup links are deployed on a network to ensure the stability of these services. In a traditional forwarding mode, the router selects a route out of several routes that are bound for the same destination network as the optimal route and delivers the route to the FIB table to guide data forwarding. If the optimal route fails, the router has to wait for route convergence to be completed before reselecting an optimal route. During this period, services are interrupted. After the router delivers the reselected optimal route to the FIB table, services are restored. Service interruption in this mode lasts a long time, which cannot meet services' requirements.

After BGP Auto FRR is enabled on a router, the router selects the optimal route from the routes that are bound for the same destination network. In addition, the router automatically adds information about the second optimal route to the backup forwarding entries of the optimal route. If the primary link fails, the router quickly switches traffic to the backup link. The switchover does not depend on route convergence. Therefore, the service interruption time is very short, reaching the sub-second level.

Pre-configuration Tasks

Before configuring BGP4+ Auto FRR, complete the following tasks:


  1. Run system-view

    The system view is displayed.

  2. Run bgp as-number

    The BGP view is displayed.

  3. Run ipv6-family unicast

    The BGP-IPv6 unicast address family view is displayed.

  4. Run auto-frr

    BGP4+ Auto FRR is enabled for unicast routes.

  5. Run commit

    The configuration is committed.

Checking the Configuration

After the configuration is complete, check whether the configuration has taken effect.

# Run the display ipv6 routing-table ipv6-address prefix-length [ longer-match ] [ verbose ] command to check the backup forwarding information of routes in the routing table of a device.

Run the display ipv6 routing-table ipv6-address prefix-length [ longer-match ] [ verbose ] command to view backup routes.

<HUAWEI> display ipv6 routing-table 2001:db8:1::1 64 verbose
Routing Table : _public_
Summary Count : 1

 Destination  : 2001:db8:1::                    PrefixLength : 64
 NextHop      : 2001:db8:10::1                  Preference   : 255
 Neighbour    : ::                              ProcessID    : 0
 Label        : NULL                            Protocol     : BGP
 State        : Active Adv Relied               Cost         : 80
 Entry ID     : 0                               EntryFlags   : 0x00000000
 Reference Cnt: 0                               Tag          : 0
 IndirectID   : 0xb06                           Age          : 10sec
 RelayNextHop : 2001:db8:10::1                  TunnelID     : 0x0
 Interface    : GigabitEthernet2/0/1            Flags        : RD
 BkNextHop    : 2001:db8:9:1::2                 BkInterface  : GigabitEthernet3/0/1
 BkLabel      : NULL                            BkTunnelID   : 0x0
 BkPETunnelID : 0x0                             BkIndirectID : 0xb07
Updated: 2019-01-03

Document ID: EDOC1100055018

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