frr (IS-IS view)

Function

The frr command enables fast reroute (FRR) for IS-IS or displays the IS-IS FRR view if FRR has been enabled.

The undo frr command disables FRR.

The ipv6 frr command enables IPv6 FRR and displays an IPv6 FRR view.

The undo ipv6 frr command enables the system to exit from an IPv6 FRR view.

By default, FRR and IPv6 FRR are disabled.

Format

frr

ipv6 frr

undo frr

undo ipv6 frr

Parameters

None

Views

IS-IS view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

To enable FRR for IS-IS or display the IS-IS FRR view if FRR has been enabled, run the frr command. Before using the frr command, you need to enable an IS-IS process.Running the undo frr command will also delete all configurations from the FRR view. Therefore, exercise caution when running this command.

On a network with redundant links, a backup link can be pre-computed through IP FRR, and then the backup link is added to the forwarding table. In this manner, if the primary link fails, traffic can be protected in time and the traffic interruption time is reduced to within 50 ms. This meets the requirement for real-time services.

The ipv6 frr command is applicable to IPv6 base topologies.

The ipv6 frr command is used to enable IPv6 FRR and enter the IPv6 FRR view.

After configuring the ipv6 frr command, run the loop-free-alternate command to compute a loop-free backup route.

Prerequisites

Before configuring the frr command, enable an IS-IS process.

Before configuring the ipv6 frr command, enable IPv6 IS-IS.

Precautions

Running the undo frr command will also delete all configurations from the FRR view. Therefore, exercise caution when running this command.

Example

# Display the FRR view for IS-IS process 1.

<HUAWEI> system-view
[~HUAWEI] isis 1
[*HUAWEI-isis-1] frr

# Enable IPv6 FRR in IS-IS process 1 and display the IPv6 FRR view.

<HUAWEI> system-view
[~HUAWEI] isis 1
[*HUAWEI-isis-1] ipv6 enable
[*HUAWEI-isis-1] ipv6 frr