Patent ID: 8174964
Filing Date: 2012-05-08
Classification: H04J,H04L

Abstract:
1. A method, comprising: at a first data processing node that is hosting at least one transport protocol connection that uses a plurality of sequence values to identify messages sent to a peer node, wherein the first node is communicatively coupled to a second data processing node serving as a redundant backup, periodically sending a checkpoint sequence value to the second node for each transport protocol connection of the at least one transport protocol connection, wherein the checkpoint sequence value is a valid sequence value for identifying messages sent over said each transport protocol connection and is initially set equal to a maximum sequence value allowed for a window of sequence values associated with the transport protocol connection; the second node detecting that the particular transport protocol connection is unavailable; in response to detecting that the particular transport protocol connection is unavailable, the second node sending a notification message to the peer node, wherein the notification message is identified by the checkpoint sequence value and is used to re-synchronize to a correct current sequence number for the particular transport protocol connection with the peer node.