Virtual router failover dampening

Details Virtual router failover dampening Virtual router failover dampening

2011-04-26

2011-04-26

Trost, IV, William (Department: 2472)

Multiplex communications

Fault recovery

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

C370S216000, C370S218000, C370S220000, C370S221000, C370S351000, C370S357000, C709S238000

Reexamination Certificate

active

07933198

ABSTRACT:
A virtual router spans a number of physical routing devices. One of the physical routing devices is designated as master, and the other physical routing devices are designated as backups to the master. A failover protocol that includes both a non-dampened state and a dampened state can be implemented. According to the failover protocol, an attempt to designate one of the backups as master in place of the current master is permitted while the virtual router is in the non-dampened state, while such an attempt is suppressed while the virtual router is in the dampened state.

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“BGP Route Flap Damping” Villamizar, et al. Standards Track Nov. 1998, 1-37.
“Virtual Router REdundancy Protocol (VRRP)” Ed. R. Hinden Standards Track Apr. 2004, 1-27.
Cisco IOS Software Releases 12.0 S “IP Event Dampening” http://www.cisco.com/en/US/docs/ios/12—0s/feature/guide/s—ipevdp.html.
ServerIron TrafficWorks L4-7 Configuration Guide Release 10.0.00a Release Date May 10, 2007, Publication Date May 10, 2007. Foundry Networks pp. 8-29-8-44.

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