RSVP IGP synchronization for remote links

MPLS builds an IGP Sync database which is independent of the MPLS-TE database. The IGP Sync database links are keyed based on IPv4 address pair (Link IP, Router-ID of Links remote end). The link is added or updated in the database whenever an LSP Path comes UP. The IGP Link is deleted or updated whenever an LSP path goes DOWN or an IGP link down event gets generated. The IGP Link database links are associated with individual LSP instances, such that when an IGP link down event reaches MPLS, MPLS can correlate it to individual LSP paths.

An RSVP IGP synchronization remote link down event can lead to any one of the below actions:

Limitations and pre-requisites