Patent ID: 8018956
Filing Date: 2011-09-13
Classification: H04L

Abstract:
1. A method, comprising: communicating, via a first node, with a second node, wherein the first node is coupled to an active endpoint and a standby endpoint; activating the standby endpoint when the active endpoint experiences a failure such that a communication involving the second node continues; and communicating a complete window's worth of packets to the second node after the failure, the window's worth of packets including a last known sequence number acknowledged by the second node, wherein the first node is an L2TP network server (LNS) and the second node is an L2TP access concentrator (LAC), wherein the standby endpoint is configured to communicate a control packet prior to propagation of HELLO packets, wherein the standby endpoint creates a particular control packet associated with an Incoming Call Request/Outgoing Call Request (ICRQ)/(OCRQ) format to be sent to the second node, the particular control packet having an unused session ID that is reserved.