LDP IGP synchronization for broadcast networks

摘要

A network element that has a broadcast interface to a broadcast network becoming operational determines whether at least one alternate path exists to the broadcast network. The broadcast interface is to carry traffic on a label switched path. If an alternate path exists, the broadcast interface will not be advertised to the broadcast network until label distribution protocol (LDP) is operational with all neighbors on the broadcast interface.

主权项

1. A method for label distribution protocol-interior gateway protocol (LDP-IGP) synchronization on a broadcast network performed on a network element, the method comprising:
detecting that a first broadcast interface of the network element has become operational, wherein the first broadcast interface will be used to carry traffic through a label switched path (LSP) between the network element and the broadcast network; determining whether the first broadcast interface is a cut-edge interface, wherein the first broadcast interface is a cut-edge interface if there is no alternate path to reach the broadcast network; and in response to determining that the first broadcast interface is not a cut-edge interface:
postponing an update to a first link state advertisement (LSA) for a period of time such that the network element expects label distribution protocol (LDP) to be operational with all LDP peers on the first broadcast interface,after postponing for the period of time, including the first broadcast interface in the first LSA, andtransmitting the first LSA that includes the first broadcast interface to the broadcast network.