We have two L3 core switches, and one L2 access switch connected to each core. All switches are 4500s and all connections are Gig-etherchannel. The access switch will be will be used to push almost all displays to our NOC, using Sun's Thin-Client adapters. If I configure both the core switches as:
"standby 1 timers msec 500 msec 1500"
will I get a fail over in three seconds?
Should I reduce the timers to 200/600 msecs for less of an outage?
If so, should I use a standby-delay statement also?
Some HSRP state flapping can occasionally occur if the holdtime is set to less than 250 milliseconds, and the processor is busy. It is recommended that holdtime values less than 250 milliseconds be used on Cisco 7200 platforms or better, and on Fast-Ethernet or FDDI interfaces or better. You can use the standby delay command to allow the interface to come up completely before HSRP initializes.
Don't have first hand experience with 4500 series, however I would guess that a 200/600 hello shouldn't be much of a problem unless you have lots of gateway interfaces and/or were using a slower supervisor.