A quick way to determine if you are running HSRP is to look at your arp cache from the command line of your windows or linux host. If you see the mac address 00-00-0c-07-ac-xx then you are running HSRP somewhere in your broadcast domain. This is a virtual MAC that is associated with a virtual IP address (VIP). It is likely that the VIP is serving as your default gateway.
We can breakdown the HSRP virtual MAC. The 00-00-0c portion is the Cisco vendor ID while the 07-ac section defines the HSRP protocol. The final 2 bits are reserved for the HSRP group number -- obviously expressed in hexidemical.
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Matt Milholen's pursuit of the Cisco Certified Networking Professional Certification is documented.
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