Patent ID: 8018839
Filing Date: 2011-09-13
Classification: H04L

Abstract:
1. A method for synchronizing sequence numbers between an inactive card and an active card in a network node, the method comprising: establishing at least one Time Division Multiplexing (TDM) pseudowire link between the network node and at least one destination node; generating at least one sequence number in the active card, wherein the active card generates a sequence number for each packet to be sent by the network node over the at least one Time Division Multiplexing (TDM) pseudowire link; establishing a communication channel on a data path between the inactive card and the active card through a fabric of the network node; sending a packet for each Time Division Multiplexing (TDM) pseudowire link including the at least one sequence number from the active card to the inactive card over the communication channel on the data path; extracting the at least one sequence number from the packet at the inactive card; and synchronizing operation upon reception of a sequence number update message, of the inactive card to the active card using the at least one sequence number extracted from the packet, wherein the packet includes at least a most recent sequence number sent by the active card; wherein the packet sent from the active card to the inactive card includes a value of the at least one sequence number and a value identifying the at least one Time Division Multiplexing (TDM) pseudowire link corresponding to the at least one sequence number.