MPLS inter-AS link protection

Link protection is essential in an MPLS network to ensure traffic restoration in case of an interface failure. The ingress router will then choose an alternate link through another interface to send traffic to its destination. In the case of an MPLS inter-AS environment, link protection can be enabled when labeled-unicast is used to send traffic between autonomous systems (ASs). Hence, MPLS inter-AS link protection is configured on the link between two routers in different ASs.