Patent ID: 8644186
Filing Date: 2014-02-04
Classification: H04L

Abstract:
1. A method, comprising: receiving a downstream label mapping at a first router; sending a message associated with the downstream label mapping toward a root router of a Multipoint Label Switched Path (MPLSP) in a network, without installing the downstream label mapping in the first router; evaluating an upstream label mapping to identify whether an address of the first router is part of a path vector associated with the upstream label mapping; installing the downstream label mapping and the upstream label mapping in the first router only if the path vector does not include the address of the first router; and adding the path vector to at least one multicast label distribution protocol (mLDP) upstream path label mapping, wherein if the address of the first router is not part of the path vector, the upstream label mapping associated with the path vector is recorded in a table of the first router; and wherein the path vector is associated with forwarding equivalence classes (FEC) and path vector changes are distributed on a FEC basis, and wherein the upstream label mapping associated with the path vector includes a wildcard FEC which indicates that the upstream label mapping changes apply to all FECs of a particular root of the path vector.