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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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Enabling OSPF IP FRR

Enabling OSPF IP FRR

Context

FRR calculation consumes a large number of CPU resources. If the device is running features with higher priorities than FRR calculation, you need to delay FRR calculation.

Perform the following steps on a switch that needs to protect traffic to be forwarded.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id | router-id router-id | vpn-instance vpn-instance-name ] *

    An OSPF process is started and the OSPF view is displayed.

  3. Run frr

    The OSPF IP FRR view is displayed.

  4. Run loop-free-alternate

    OSPF IP FRR is enabled to generate a loop-free backup path.

    NOTE:

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

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

    An OSPF IP FRR filtering policy is configured.

    After an OSPF IP FRR filtering policy is configured, only OSPF backup routes that pass the filtering criteria defined in the policy can be added to the forwarding table.

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

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

    By default, the solution of selecting a backup path for OSPF 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 higher-cost path is selected as the backup path. To change the solution of selecting a backup path for OSPF IP FRR to smallest-cost path first, run the tiebreaker command. After the command is run, the smallest-cost path is selected as the backup path.

  7. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074760

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