James H Forster

US Patent:

RE44661, Dec 24, 2013

Filed:

Dec 6, 2006

Appl. No.:

11/636725

Inventors:

Feisal Daruwalla - Cary NC, US
James R. Forster - Los Altos CA, US
Guenter E. Roeck - San Jose CA, US
John T. Chapman - Cupertino CA, US
Joanna Qun Zang - San Jose CA, US
Yong Lu - Saratoga CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/26
H04J 1/16
G06F 11/00
G08C 15/00
G01R 31/08

US Classification:

370216, 370217, 370432, 709239, 712 28

Abstract:

A protection CMTS is available to immediately service a cable modem should that modem's service from a working CMTS fail for any reason. To speed the service transfer (cutover) from the working CMTS to the protection CMTS, the cable modem may preregister with the protection CMTS well before the cutover becomes necessary. The cable modem's registration with both the working CMTS and the protection CMTS preferably employs a single IP address, so that the cable modem need not obtain a new IP address during cutover. While the cable modem may register with both the working CMTS and the protection CMTS, the devices are designed or configured so that only the working CMTS injects a host route for the cable modem into the appropriate routing protocol. Only after cutover to the protection CMTS does the protection CMTS inject its host route.