This last week, I ended up doing a basic deployment over at the AT&T NOC here in Mesa, Arizona. There's nothing like the feeling of walking into a NOC, complete with full hand scanners that also check for a pulse equipping each door, hundreds of racks of equipment, the fan whir so loud that you can't hear yourself think. Ah, I'm slipping back into it just thinking about it.
Back to the topic at hand.
This redundant topology just begged to use one of the redundancy protocols: HSRP, VRRP, or GLBP. The big question is...which one? ...and why? Well, me being a Cisco spud, I immediately gravitated to HSRP since that's all I know very well. But before I left, I decided to check out the competition, here's what I found:
Cisco Hot-Standby Router Protocol (HSRP):
- Created by Cisco, for Cisco in 1994
- Uses a default hello timer of 3 seconds with a hold timer of 10 seconds