Dynamically controlling HSRP preemption dependent on...

Details Dynamically controlling HSRP preemption dependent on... Dynamically controlling HSRP preemption dependent on...

2005-12-15

2009-10-27

Pham, Chi H (Department: 2416)

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

C370S220000, C370S244000, C370S401000

Reexamination Certificate

active

07609618

ABSTRACT:
The invention relates to a method for switchover from an active node to a standby node wherein when a standby network node restarts, designation of the standby node as a new active node is delayed according to 1) the period of a delay timer and 2) a counter indicating the number of data messages the standby node will be receiving from the active network node. The active node sends a notification to the standby node identifying a number of data messages that the active network node needs to send to the standby node. The standby node stores the number in a counter and decrements the counter upon receiving data messages. When the delay timer expires, the standby network node transitions to become the new active node only when the counter has reached zero. If the counter is not yet zero, then the switchover delay timer is restarted and the cycle repeats.

REFERENCES:
patent: 6687245 (2004-02-01), Fangman et al.
patent: 7042876 (2006-05-01), Jayasenan et al.
patent: 7227872 (2007-06-01), Biswas et al.
patent: 7260649 (2007-08-01), Somasundaram et al.
patent: 7280557 (2007-10-01), Biswas et al.
patent: 7486611 (2009-02-01), Wilson
patent: 2005/0147028 (2005-07-01), Na et al.
patent: 2006/0092856 (2006-05-01), Mitsumori
patent: 2006/0120279 (2006-06-01), Mitsumori
patent: 2006/0120366 (2006-06-01), Jayasenan et al.
T. Li et al., “Cisco Hot Standby Router Protocol (HSRP),” Mar. 1998, retrieved from the internet: < URL: http://www.ietf.org/rfc/rfc2281.txt>, retrieved on Mar. 22, 2006. (15 pages).
Cisco Systems, Inc., Release 12.4T New Features and Hardware Support, No. 3001 retrieved from the internet: < URL: http://www.cisco.com/en/US/products/ps6441/prod—bulletin09186a...>, retrieved on Mar. 22, 2006. (72 pages).
Cisco Systems, Inc., “HSRP Commands on Cisco IOS XR Software,” retrieved retrieved from the internet: < URL: http://www.cisco.com/univercd/cc/td/doc/product/software/iosxr3/ad...>, retrieved on Mar. 22, 2006. (17 pages).
Cisco Systems, Inc., “Nonstop Forwarding with Stateful Switchover on the Cisco Catalyst 6500,” retrieved from the internet: < URL: http://www.cisco.com/en/US/products/hw/switches/ps708/products—...>, retreived on Mar. 22, 2006. (12 pages).
Cisco Systems, Inc., “Nonstop Forwarding with Stateful Switchover on the Cisco Catalyst 6500,” White Paper, 2005. (16 pages).

Affiliated with

Also associated with

Rating

Dynamically controlling HSRP preemption dependent on... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dynamically controlling HSRP preemption dependent on..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamically controlling HSRP preemption dependent on... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4120631