loop-free-alternate (OSPFv3)

Function

The loop-free-alternate command enables OSPFv3 IP FRR to enable the device to use the LFA algorithm to calculate the nexthop and outbound interface for the dynamic backup link.

The undo loop-free-alternate command disables OSPFv3 IP FRR.

By default, this function is disabled.

Product	Support
S5720-EI, S5720-HI, S5720I-SI, S5720S-SI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5730-HI, S5730S-EI, S5730-SI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6720S-SI, S6720-SI, S6730-H, S6730S-H, S6730-S, and S6730S-S	Supported
S2720-EI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S6720-LI, and S6720S-LI	Not supported

Format

loop-free-alternate

undo loop-free-alternate

Parameters

None

Views

OSPFv3 FRR view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

The frr command run in the OSPFv3 view creates and displays the OSPFv3 FRR view only, but cannot enable the OSPFv3 IP FRR function. You must run the loop-free-alternate command in the OSPFv3 view to enable OSPFv3 IP FRR use the LFA algorithm to calculate the nexthop and outbound interface for the dynamic backup link to create the loop-free backup route.

Follow-up Procedure

Run the frr-policy route command in the OSPFv3 view to configure a filtering policy for OSPFv3 IP FRR. Only the OSPFv3 backup route that satisfies specific rules can be delivered to the forwarding table.

Example

# Enable OSPFv3 IP FRR to create the loop-free backup route.

<HUAWEI> system-view
[HUAWEI] ospfv3
[HUAWEI-ospfv3-1] frr
[HUAWEI-ospfv3-1-frr] loop-free-alternate