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post-convergence-lfa (Protocols OSPF)

date_range 20-Nov-23
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Syntax

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post-convergence-lfa <fate-sharing-protection fate-sharing-protection<node-protection <cost cost> <srlg-protection>;

Hierarchy Level

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[edit logical-systems name protocols ospf area interface interface-name ],
[edit logical-systems name routing-instances name protocols ospf area interface interface-name],
[edit protocols ospf area interface interface-name ],
[edit routing-instances name protocols ospf area interface interface-name]

Description

Configure the installation of backup-paths that follow the post-convergence paths corresponding to the failure of this interface.

Options

fate-sharing-protection

Enable fate-sharing protection. A list of fate-sharing groups are configured on each point of local repair (PLR) with the links in each fate-sharing group identified by their respective IP addresses. The PLR associates a cost with each fate-sharing group. The fate-sharing-aware post-convergence path is computed by assuming that the cost of each link in the same fate-sharing group as the failed link has increased the cost associated with that group.

node-protection

Enable node protection mode for topology-independent loop-free alternate (TI-LFA) routes for OSPF.

cost

Enable a node-protecting post-convergence backup path to be computed for all primary next-hops using this interface. Configure the cost of all the links used for calculating the TI-LFA post-convergence failure path cost. If node protection is enabled without configuring a cost value, then the cost is set to the maximum cost or default value of 65535.

  • Default: 65535

  • Range: 1 through 65535

srlg-protection

Enable Shared Risk Link Group (SRLG) protection in an OSPFv2 network if you want OSPFv2 to choose a fast reroute path that does not include SRLG links in the topology-independent loop-free alternate (TI-LFA) backup paths. If you have configured fate-sharing-protection in addition to srlg-protection then both costs are added to the link metric to calculate the final TI-LFA backup path. These links have a higher metric cost and therefore TI-LFA backup computation enables OSPFv2 to avoid these links.

Required Privilege Level

routing

Release Information

Statement introduced in Junos OS Release 18.2R1 for MX Series, PTX Series, and QFX Series.

fate-sharing-protection option introduced in Junos OS release 20.3R1 for MX Series and PTX Series.

srlg-protection option introduced in Junos OS release 20.3R1 for MX Series and PTX Series.

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