Patents by Inventor Christopher Sherwin

Christopher Sherwin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Router and method for protocol process migration
    Patent number: 7583590
    Abstract: A router and a method for migrating routing protocol processes or Virtual Routers (VRs) from one Route Processor (RP) to another using graceful restart procedures for maintaining packet flow to the router and assisting the router to obtain restart information. The router includes first and second RPs and a forwarding engine for forwarding packets to neighbor routers in the network. When the routing protocol process is terminated on the first RP, the neighbor routers detect a router failure and initiate the graceful restart procedures. A filter rule in the forwarding engine causes it to forward packets to the new routing protocol process on the second RP. The new process learns the network topology from the neighbor routers, and the migration is completed without packet loss and without requiring complex changes to the network protocol stack.
    Type: Grant
    Filed: July 15, 2005
    Date of Patent: September 1, 2009
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Kaarthik Sivakumar, Suresh Bhogavilli, Samir Shah, Christopher Sherwin
  • Router and method for protocol process migration
    Publication number: 20070014231
    Abstract: A router and a method for migrating routing protocol processes or Virtual Routers (VRs) from one Route Processor (RP) to another using graceful restart procedures for maintaining packet flow to the router and assisting the router to obtain restart information. The router includes first and second RPs and a forwarding engine for forwarding packets to neighbor routers in the network. When the routing protocol process is terminated on the first RP, the neighbor routers detect a router failure and initiate the graceful restart procedures. A filter rule in the forwarding engine causes it to forward packets to the new routing protocol process on the second RP. The new process learns the network topology from the neighbor routers, and the migration is completed without packet loss and without requiring complex changes to the network protocol stack.
    Type: Application
    Filed: July 15, 2005
    Publication date: January 18, 2007
    Inventors: Kaarthik Sivakumar, Suresh Bhogavilli, Samir Shah, Christopher Sherwin