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Configuring Node-Link Protection for OSPF
You can configure node-link protection on any interface for which OSPF is enabled. Node-link protection establishes an alternate path through a different router altogether for all destination routes that traverse a protected interface. Node-link protection assumes that the entire router, or node, has failed. The Junos OS therefore calculates a backup path that avoids the primary next-hop router.
Node-link protection is supported on the following:
- OSPFv2 and OSPFv3 interfaces
- OSPFv3 unicast realms
- OSPFv2 unicast topologies
- All routing instances supported by OSPFv2 and OSPFv3
- Logical systems
To configure node-link protection for an OSPF interface:
- Include the node-link-protection statement at the [edit protocols (ospf | ospf3) area area-id interface interface-name hierarchy level.
 | Best Practice: You must also configure a per-packet load-balancing routing policy to ensure that the routing protocol process installs all the next hops for a given route in the routing table. |
In the following example, the OSPF interface so-0/0/0.0 in area 0.0.0.0 is configured for node-link protection. If a link for a destination route that traverses this interface becomes unavailable, the Junos OS creates a loop-free backup path through a different router altogether, thus avoiding the primary next-hop router.
