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Configuration Guide - IP Routing 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - IP Routing
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Configuring IPv4 FRR

Configuring IPv4 FRR

IPv4 FRR is applicable to IPv4 services that are sensitive to the packet loss and delay.

Usage Scenario

Public network IPv4 FRR is applicable to services that are sensitive to packet loss or delay on the public network.

After FRR is configured, if a fault is detected at the lower layer, the fault is reported to the upper-layer routing system. Then, packets are forwarded through a backup link, which minimizes the impact of link faults on ongoing services.

IPv4 FRR enables routes of different protocols to back up each other, which may result in loops.

With IP FRR, traffic is switched to a backup link if the primary link fails and switched back when the primary link recovers. If the inbound and outbound interfaces reside on different boards, packet loss may occur during the switchback. The packet loss duration varies with the service volume and CPU usage. To prevent the packet loss, perform any of the following operations:
  • Run the timer spf command in the IS-IS view.
  • Run the spf-schedule-interval command in the OSPF view.
  • Run the route-select delay command in the BGP view.

Pre-configuration Tasks

Before configuring IPv4 FRR, complete the following task:

  • Configure parameters of the link layer protocol and IPv4 addresses for interfaces and ensure that the link layer protocol on the interfaces is Up.

  • Configure routes of different routing protocols but destined for the same destination address.


  1. Run system-view

    The system view is displayed.

  2. Run ip frr

    IPv4 FRR is enabled.


    If FRR is configured both in the system view and a routing protocol view, the FRR that is configured in the routing protocol view preferentially takes effect.

  3. Run commit

    The configuration is committed.

Checking the Configurations

Run the following commands to check the previous configuration.

  • Run the display ip routing-table verbose command to check information about outbound interfaces and next hops of backup routes in the routing table.

  • Run the display ip routing-table ip-address [ mask | mask-length ] [ longer-match ] verbose command to check information about the outbound interface and next hop of the route matching the specified condition in the routing table.

  • Run the display ip routing-table ip-address1 { mask1 | mask-length1 } ip-address2 { mask2 | mask-length2 } verbose command to check information about outbound interfaces and next hops of routes matching the specified IP address and mask ranges in the routing table.

# Run the display ip routing-table verbose command to view information about route backup.

<HUAWEI> display ip routing-table verbose
Route Flags: R - relay, D - download
to fib, T - to vpn-instance, B - black hole route
Routing Table : _public_
Summary Count : 1

     Protocol: OSPF            Process ID: 1
   Preference: 10                    Cost: 3
      NextHop:     Neighbour:
        State: Active Adv             Age: 00h06m49s
          Tag: 0                 Priority: low
        Label: NULL               QoSInfo: 0x0
   IndirectID: 0x0
 RelayNextHop:          Interface: GigabitEthernet0/2/0
     TunnelID: 0x0                  Flags:  D
    BkNextHop:   BkInterface: GigabitEthernet0/3/0
      BkLabel: NULL           SecTunnelID: 0x0
 BkPETunnelID: 0x0        BkPESecTunnelID: 0x0
 BkIndirectID: 0x0
Updated: 2019-01-14

Document ID: EDOC1100058916

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