US 7,321,981 B1 | ||
Multi-port line card redundancy technique for an intermediate network node | ||
Gary S. Muntz, Lexington, Mass. (US) | ||
Assigned to Cisco Technology, Inc., San Jose, Calif. (US) | ||
Filed on Feb. 28, 2001, as Appl. No. 9/796,046. | ||
Int. Cl. G06F 11/00 (2006.01) |
U.S. Cl. 714—4 [714/11; 370/216] | 20 Claims |
1. A method for automatically reconfiguring ports on line cards of an aggregation router in the event of a failure to at least
one of the ports, the method comprising the steps of:
organizing first and second line cards as a redundant pair of line cards, wherein each line card is a multi-port line card
having a plurality of ports;
coupling a first external device to a first port on the first multi-port line card and a corresponding first port on the second
multi-port line card over a pair of first connections;
automatically enabling the first port of the first multi-port line card of the redundant pair to assume responsibility for
reception of data from the first external device in the event of a failure to one of the corresponding first port of the second
multi-port line card of the redundant pair and its first connection to the first external device; and
transmitting identical data over the pair of first connections from the first external device to the redundant multi-port
line cards of the aggregation router.
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