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Configuration Guide - IP Unicast Routing

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.
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Configuring OSPFv3 IP FRR

Configuring OSPFv3 IP FRR

Applicable Environment

With the development of networks, Voice over IP (VoIP) and on-line video services require high-quality real-time transmission. Nevertheless, if an OSPFv3 fault occurs, traffic can be switched to a new link after far more than 50 ms, which does not meet the requirement for real-time services on the network.

Normally, traffic can be switched to a new link after the following processes: fault detection in milliseconds, notifying the fault to the routing control plane in milliseconds, generating and flooding new topology information in tens of milliseconds, triggering SPF calculation in tens of milliseconds, and notifying and installing a new route in hundreds of milliseconds. As a result, all the processes take far more than 50 milliseconds.

With OSPFv3 IP FRR that calculates a backup link in advance, devices can rapidly switch traffic to the backup link without interrupting services when the primary link becomes faulty. This protects traffic and greatly improves the reliability of OSPFv3 networks.

Pre-configuration Tasks

Before Configuring OSPFv3 IP FRR, complete the following tasks:

Procedure

  1. Enabling OSPFv3 IP FRR
    1. Run system-view

      The system view is displayed.

    2. Run ospfv3 [ process-id ]

      An OSPFv3 process is enabled, and the OSPFv3 view is displayed.

    3. Run frr

      The OSPFv3 IP FRR view is displayed.

    4. Run loop-free-alternate

      OSPFv3 IP FRR is enabled, and a loop-free backup link is generated.

      NOTE:

      OSPFv3 can generate a loop-free backup link only when the OSPFv3 IP FRR traffic protection inequality is met.

    5. (Optional) Run frr-policy route route-policy route-policy-name

      An OSPFv3 IP FRR filtering policy is configured.

      After the OSPFv3 IP FRR filtering policy is configured, only the OSPFv3 backup routes that match the filtering conditions of the policy can be added to the forwarding table.

    6. (Optional) Run tiebreaker { node-protecting | lowest-cost } preference preference

      The solution of selecting a backup path for OSPFv3 IP FRR is set.

      By default, the solution of selecting a backup path for OSPFv3 IP FRR is node-protection path first. In some cases, the solution needs to be changed to smallest-cost path first because of data forwarding capacity or link cost consideration. By default, the bigger-cost path is selected as the backup path. To change the solution of selecting a backup path for OSPFv3 IP FRR to smallest-cost path first, run the tiebreaker command. After the command is run, smallest-cost path is selected as the backup path.

    7. Run commit

      The configuration is committed.

  2. (Optional) Blocking FRR on an OSPFv3 Interface
    1. In system view, run: interface interface-type interface-number

      The view of the OSPFv3 interface running FRR is displayed.

    2. Run ospfv3 frr block [ instance instance-id ]

      FRR is blocked on the OSPFv3 interface.

    3. Run commit

      The configuration is committed.

  3. (Optional) Binding IP FRR and BFD

    OSPFv3 IP FRR requires the lower layer to fast respond to the link change so that traffic can be rapidly switched to the backup link if the primary link fails.

    1. Bind IP FRR and BFD in an OSPFv3 process.

      • Run system-view

        The system view is displayed.

      • Run ospfv3

        An OSPFv3 process is enabled, and the OSPFv3 view is displayed.

      • Run bfd all-interfaces frr-binding

        IP FRR and BFD are bound in the OSPFv3 process.

      • Run commit

        The configuration is committed.

    2. Bind IP FRR and BFD on a specified OSPFv3 interface.

      • Run system-view

        The system view is displayed.

      • Run interface interface-type interface-number

        An interface view is displayed.

      • Run ospfv3 bfd frr-binding

        IP FRR and BFD are bound on the interface.

      • Run commit

        The configuration is committed.

Verifying the Configuration

Run the display ospfv3 [ process-id ] routing verbose command to view the primary link and backup link after OSPFv3 IP FRR is enabled.

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Updated: 2019-04-20

Document ID: EDOC1100074760

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