| US 7,593,398 B2 | ||
| Layer-two interworking applied to L2-L3 pseudowires | ||
| Earl Hardin Booth, III, Raleigh, N.C. (US); W. Scott Wainner, Potomac Falls, Va. (US); W. Mark Townsley, Nashville, Tenn. (US); and Christopher Metz, Danville, Calif. (US) | ||
| Assigned to Cisco Technology, Inc., San Jose, Calif. (US) | ||
| Filed on Sep. 08, 2005, as Appl. No. 11/221,964. | ||
| Prior Publication US 2007/0053366 A1, Mar. 08, 2007 | ||
| Int. Cl. H04L 12/28 (2006.01); H04J 3/16 (2006.01) | ||
| U.S. Cl. 370—389 [370/401; 370/469] | 26 Claims |
| 1. In a network including a Layer 2 Switching Entity (L2SE) in communication with a Layer 3 Routing Entity (L3RE), a method
of performing Layer 2 (L2) interworking comprising:
receiving a L2 Protocol Data Unit (PDU) at said L2SE;
converting said L2 PDU to a normalized Pseudowire (PW) PDU at said L2SE; and
forwarding said normalized PW PDU from said L2SE to said L3RE;
wherein the L3RE includes an edge router which is constructed and arranged to provide a virtual L2 interface; and
wherein forwarding said normalized PW PDU from said L2SE to said L3RE includes, in an integrated manner, (i) removing tunneling
encapsulation from the PW PDU to decapsulate the PW PDU into an Internet Protocol payload and (ii) processing the Internet
Protocol payload as a Layer 3 routed packet through the virtual L2 interface.
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