After EFM is associated with IPv4 static routes, the system responds to the interface Up or Down event that is triggered by the change of the EFM OAM extension status and determines whether to activate static routes. This mechanism controls route advertisement and ensures that the traffic from the remote end can be correctly forwarded.
On an MPLS network with primary and secondary LSPs established by LSRs using static routes, association between LDP and static routes prevents traffic from being interrupted during traffic switchover or switchback.