MPLS LDP Targeted Hellos

MPLS LDP targeted hellos are a specific type of hello message used in Multiprotocol Label Switching (MPLS) networks. They are part of the Label Distribution Protocol (LDP) and serve the following purposes:

• Targeted hellos are sent directly to a specific LDP peer, unlike basic LDP hellos which are sent to all neighbors.

• They are used to establish and maintain LDP sessions between non-directly connected routers.

• Targeted hellos allow for the creation of LDP sessions across multiple hops, which is useful in scenarios like MPLS Traffic Engineering or when setting up LDP sessions with route reflectors.

• They help in discovering and maintaining LDP peers that are not on the same subnet or directly connected.

• Targeted hellos are sent as unicast messages to a specific IP address, rather than being broadcast or multicast.

MPLS LDP targeted hellos enable more flexible LDP peering arrangements in MPLS networks, allowing for sessions between routers that are not immediate neighbors.