The loop-free-alternate command enables OSPF 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 OSPF 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 |
Usage Scenario
The frr command run in the OSPF view creates and displays the OSPF FRR view only, but cannot enable the OSPF IP FRR function. You must run the loop-free-alternate command in the OSPF view to enable OSPF 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 OSPF view to configure a filtering policy for OSPF IP FRR. Only the OSPF backup route that satisfies specific rules can be delivered to the forwarding table.