Patent ID: 8223669
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. A network comprising: a first node configured to transmit a label request message comprising a label request header, a label request message identification (ID), a first forwarding equivalence class (FEC) type length value (TLV), and an Multi-topology (MT)-ID TLV; and a second node configured to receive the label request message and send a label mapping message to the first node, wherein the MT-ID TLV comprises an unknown (U) bit, a forward unknown (F) bit, a TLV Code Point field, a TLV length field, and an MT-ID field, wherein the U bit indicates how the second node should respond upon receiving a message containing an unknown TLV, wherein the F bit indicates whether the second node should forward the message containing the unknown TLV, wherein the TLV code point field comprises a specific value to indicate the MT-ID-TLV, wherein the length field specifies the length of the MT-ID TLV, and wherein the MT-ID field specifies a topology assigned to a network topology from a topology-to-label table.