Hot Standby Router Protocol
The second method you might think of implementing is Hot Standby Router Protocol (HSRP). For those of you from the data arena, you are probably already overly familiar with HSRP. HSRP allows devices on your network to reach a secondary GW, router, or GK if the primary cannot be communicated with. HSRP is invisible to the end user; this is achieved by setting up a virtual IP address instead of using the real IP of the device. In the voice world, it can be your GK or GW; in the data world, it is your default GW. You must know a few important things when implementing HSRP on your voice network. The main point is that no state information is maintained when failure occurs. Cisco recommends using clustering with GKs, which ...
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