inter-level-protect level-1(IS-IS FRR view)

Function

The inter-level-protect level-1 command enables cross-level protection in IS-IS Level-1.

The undo inter-level-protect level-1 command disables cross-level protection in IS-IS Level-1.

By default, IS-IS cross-level protection is disabled.

Format

inter-level-protect level-1 [ prefer ]

undo inter-level-protect level-1 [ prefer ]

Parameters

Parameter	Description	Value
prefer	Indicates that the protection priority of inter-level IS-IS is higher than that of intra-level IS-IS TI-LFA FRR.	-

Parameter

Description

Value

prefer

Indicates that the protection priority of inter-level IS-IS is higher than that of intra-level IS-IS TI-LFA FRR.

Views

IS-IS FRR view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

By default, IS-IS supports TI-LFA path computation at the same level, but does not support cross-level path computation. If a Level-1 loop is open and no Level-1 backup path is available, TI-LFA FRR cannot be implemented in Level-1. After this command is enabled, a Level-2 path can be used to protect the Level-1 primary path, ensuring that the convergence time of FRR switching is within 50 ms.

Example

# Enable SRv6 cross-level protection in IS-IS Level-1.

<HUAWEI> system-view
[~HUAWEI] segment-routing ipv6
[*HUAWEI-segment-routing-ipv6] locator test1 ipv6-prefix 2001:DB8:100:: 64 static 32
[*HUAWEI-segment-routing-ipv6-locator] quit
[*HUAWEI-segment-routing-ipv6] quit
[*HUAWEI] isis 1
[*HUAWEI-isis-1] ipv6 enable
[*HUAWEI-isis-1] cost-style wide
[*HUAWEI-isis-1] segment-routing ipv6 locator test1 auto-sid-disable
[*HUAWEI-isis-1] ipv6 frr
[*HUAWEI-isis-1-ipv6-frr] inter-level-protect level-1

# Enable SR cross-level protection in IS-IS Level-1.

<HUAWEI> system-view
[*HUAWEI] isis 1
[*HUAWEI-isis-1] cost-style wide
[*HUAWEI-isis-1] segment-routing mpls
[*HUAWEI-isis-1] frr
[*HUAWEI-isis-1-frr] inter-level-protect level-1