I spent a little time this morning learning about the HSRP (Hot Standby Router Protocol) and how to configure it in a real world environment. This is something that I might think about implementing in our networking system actually. It works by creating redundancy between two routers in case one router loses internet connectivity, the other router can take over. The configuration was rather simple and easy to understand. You're basically creating a virtual IP (VIP) that your internal network will use rather than the routers actual Ethernet IP address. I have including a sample configuration below:
Router_A#sh run int fa0/0
Building configuration...
Current configuration : 166 bytes
!
interface FastEthernet0/0
ip address 192.168.100.2 255.255.255.0 (actual IP address)
duplex auto
speed auto
standby ip 192.168.100.1 (VIP address configured on Router B as well)
standby preempt (Tells the router to try and become primary when circuit is back up)
standby track Serial0/0 10 (decrements HSRP priority, router with highest is primary router)
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