Synchronization Behavior on LAN Interfaces

LDP-IGP synchronization does not take place on LAN interfaces unless the IGP has a point-to-point connection over the LAN configured on the interface. The reason for this is that multiple LDP peers might be connected on such an interface unless a point-to-point connection to a single peer has been configured. Because synchronization raises the cost on the interface high enough to prevent traffic being forwarded to that link, if multiple peers are connected, the cost is raised on all the peers even though LDP might be unsynchronized with only one of the peers. Consequently, traffic is diverted away from all the peers, an undesirable situation.

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