Samir A Shah

US Patent:

7599286, Oct 6, 2009

Filed:

Mar 1, 2005

Appl. No.:

11/069178

Inventors:

Suresh Bhogavilli - Gaithersburg MD, US
Samir Shah - Rockville MD, US
Kaarthik Sivakumar - Santa Rosa CA, US

Assignee:

Telefonaktiebolaget L M Ericsson (Publ) - Stockholm

International Classification:

H04L 12/28
H04L 12/66
G06F 15/16

US Classification:

370217, 370235, 370401, 370409, 709230, 709249

Abstract:

A system and method for improving network performance when communicating between a first site network and a second site network via an IP-based transport network. The site networks include a LAN, a plurality of host/media gateways (MGWs) connected to the LAN, and pairs of first and second Site Edge Routers (SERs) connected to the LAN for handling traffic from different host/MGWs. The SERs are configured as redundant backup pairs in which each SER in a given pair backs up the other SER in the pair. Each SER is connected to a different Provider Edge (PE) router in the transport network via a dedicated link that has sufficient spare capacity to carry traffic coming from both of the SERs in a given pair of SERs in case one of the SERs fails. The SERs provide preferred routing prefixes to the PE routers, thereby guaranteeing symmetric paths for bidirectional traffic.