Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Reexamination Certificate
2005-03-01
2009-10-06
Hsu, Alpus H (Department: 2419)
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
C370S235000, C370S401000, C370S409000, C709S230000, C709S249000
Reexamination Certificate
active
07599286
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.
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Bhogavilli Suresh
Shah Samir
Sivakumar Kaarthik
Hsu Alpus H
Telefonaktiebolaget L M Ericsson (Publ)
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