US 2010/0166020 A1Published application

Mlppp sequence number synchronization between the active and standby transmitters

AssigneeAlcatel Lucent

InventorSasha Rantsevitch

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Abstract

A method and system for MLPPP sequence number synchronization between the active and standby side transmitters is disclosed. The MLPPP sequence number synchronization system includes a method for the standby side to associate transmit frame fragment numbers used by the active side to those generated by the transmitter on the standby side. The association is used to produce an offset which is used to synchronize the active and standby transmitters. The MLPPP sequence number synchronization system is particularly useful for overcoming the drawbacks of high bandwidth signaling between active and standby sides of switches known in the art.

Claims16

Dependent claims

A method for synchronizing the transmit frame fragment sequence numbers of active and standby transmitters on line cards in a switch supporting multilink protocol having active and standby sides, said method comprising the steps of:

initializing a standby transmit sequence number for the standby transmitter to an initial value;
incrementing said standby transmit sequence number with each transmit frame fragment handled by the standby transmitter;
associating said standby transmit sequence number with respective receive sequence numbers received by the switch;
determining an association of transmit frame fragment sequence numbers used by the active transmitter for respective receive sequence numbers received by the switch;
calculating an offset to said standby transmit sequence number based upon the difference between said standby transmit sequence number associated to a specific receive sequence number and an active transmit frame fragment sequence number associated to the same specific receive sequence number;
and
applying said offset to said standby transmit sequence number to bring said standby transmit sequence number in synchronization with the transmit sequence numbers of the active side.

4 more elements

Dependencies are inferred from the claim text.