Method and apparatus for pseudowire (pw) setup and maintenance using ospf protocol
AssigneeFuturewei Technologies, Inc.
InventorsUma S. Chunduri, Evgeny Tantsura
Life of this patent
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Abstract
A provider edge (PE) router and methods for establishing a pseudowire using open shortest path first (OSPF) link state advertisement (LSA) messages. The pseudowire links the PE router with a remote PE router through a packet switched network (PSN), and emulates other communications protocols to provide customer edge (CE) equipment connected to the PE routers the appearance of a dedicated private circuit.
Claims20
A method for a local provider edge (PE) router to communicate over a pseudowire, the method comprising:
- creating a first open shortest path first (OSPF) link state advertisement (LSA), wherein the first OSPF LSA comprises a pseudowire capability type-length-value (TLV) element;
- sending the first OSPF LSA to a remote PE router via a packet switched network (PSN);
- receiving a second OSPF LSA from the remote PE router via the PSN, wherein the second OSPF LSA comprises a pseudowire capability TLV element;
- creating a third OSPF LSA, wherein the third OSPF LSA comprises a pseudowire association TLV element;
- sending the third OSPF LSA to the remote PE router via the PSN;
- receiving a fourth OSPF LSA from the remote PE router via the PSN, wherein the fourth OSPF LSA comprises a pseudowire association TLV element;
- and
- establishing a pseudowire connection with the remote PE router via the PSN according to the pseudowire association TLV element of the third OSPF LSA.
A method for a local provider edge (PE) router to communicate over a pseudowire, the method comprising:
- receiving a first open shortest path first (OSPF) link state advertisement (LSA) from a remote PE router via a packet switched network (PSN), wherein the first OSPF LSA comprises a pseudowire association type-length-value (TLV) element;
- creating a second OSPF LSA, wherein the second OSPF LSA comprises a pseudowire association TLV element;
- flooding the second OSPF LSA to a plurality of routers in the PSN, wherein the remote PE router is one of the plurality of routers in the PSN;
- and
- establishing a pseudowire connection with the remote PE router via the PSN according to the pseudowire association TLV element of the first OSPF LSA.
A provider edge (PE) router comprising:
- a first network interface configured to communicate with a customer edge (CE) router;
- a second network interface configured to communicate with a packet switched network (PSN);
- a memory configured to store a label forwarding information base (LFIB),
- a processor coupled with the first network interface, the second network interface, and the memory, and wherein the processor is configured to:
- create a first open shortest path first (OSPF) link state advertisement (LSA), wherein the first OSPF LSA comprises a pseudowire capability type-length-value (TLV) element;
- send the first OSPF LSA to a remote PE router via the second network interface;
- receive a second OSPF LSA from the remote PE router via the second network interface, wherein the second OSPF LSA comprises a pseudowire capability TLV element;
- create a third OSPF LSA, wherein the third OSPF LSA comprises a pseudowire association TLV element;
- send the third OSPF LSA to the remote PE router via the second network interface;
- receive a fourth OSPF LSA from the remote PE router via the second network interface, the fourth OSPF LSA comprising a pseudowire association TLV element;
- and
- establish a pseudowire connection with the remote PE router via the second network interface according to the pseudowire association TLV element of the third OSPF LSA.
Dependencies are inferred from the claim text.