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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

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 IPv6 IS-IS Auto FRR

Configuring IPv6 IS-IS Auto FRR

Applicable Environment

As the network keeps developing, services such as Voice over IP (VoIP) and on-line video services require high-quality real-time transmission. Nevertheless, if an IS-IS fault occurs, traffic can be switched to a new link only after the following processes: fault detection, LSP update, LSP flooding, route calculation, and FIB entry delivery. As a result, traffic is interrupted for much more than 50 ms, which cannot meet the requirement for real-time services on the network.

With IPv6 IS-IS Auto FRR, devices can rapidly switch traffic from faulty links to backup links without interrupting the traffic. This protects traffic and greatly improves the reliability of IS-IS networks.

IPv6 IS-IS Auto FRR is applicable to the services that are very sensitive to packet delay and packet loss.

Pre-configuration Tasks

Before configuring IPv6 IS-IS Auto FRR, complete the following task:

Configuring Basic IPv6 IS-IS Functions


  1. Run system-view

    The system view is displayed.

  2. Run isis [ process-id ]

    The IS-IS process is enabled and the IS-IS view is displayed.

  3. Run ipv6 frr

    The IPv6 IS-IS FRR view is displayed.

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

    Backup routes are filtered using a filtering policy. Only backup routes that have passed the filtering policy are added to the routing table.

  5. Run loop-free-alternate [ level-1 | level-2 | level-1-2 ]

    IPv6 IS-IS Auto FRR is enabled and the loop-free backup route is created.

    If the IS-IS level is not specified, IPv6 IS-IS Auto FRR is enabled on Level-1 and Level-2 to create the backup route.

  6. Run commit

    The configuration is committed.

Verifying the Configuration

Run the display isis route [ process-id | vpn-instance vpn-instance-name ] ipv6 [ verbose | [ level-1 | level-2 ] | ipv6-address [ prefix-length ] ] * command to check information about the primary link and backup link after IPv6 IS-IS Auto FRR is enabled.

Updated: 2019-03-21

Document ID: EDOC1000166601

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