If router A has a higher priority and is setup to preempt, then when it comes back up (after a failure), it will resume being the active. If router A does not setup with preempt, it won't become the active until Router B fails or is restarted, etc.
HSRP works by "projecting" a virtual IP address and a virtual MAC address. You would configure the clients/workstations with a gateway that is the virtual IP address (or the standby IP). Whenever the end device sends an ARP which the routers resolve to the virtual MAC. It is possible to use a Burned-in (MAC) Address (called a BIA) in case the default virtual MAC causes a problem. Once the end workstation resolves the virtual IP to the virtual MAC, it communicates with the virtual MAC, in which both routers receive and take note of the traffic, but only the active router will actually forward the traffic. This is a "in a nutshell" view of HSRP and I'm sure there is something that I've left out or said wrong, but that's basically it.. Mike W. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24740&t=24721 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
