Study Session Number 11! Hot Standby Router Protocol! #12

Hi Everyone! 

Today I decided to learn about HSRP, this is a new concept for me so you'll have to bare with me if I get anything wrong! So anyways -

From what I've learned so far two routers are configured with a crossover cable to each other to provide redundancy, from here HSRP is configured at the interface-level when this happens a virtual IP address is created and this will be used as the default gateway of the PC's, one router will be assigned as the active router and the other will be standby when the standby doesn't receive any hello messages the standby router takes over and becomes the active router (the protocol name really suits whats happening here!).

To configure a router to be an active router the router priority is manually changed (the default priority is 100), the higher priority is considered the better one, if both routers have the same priority it then uses the highest IP address to decide what router will be active and what router will be standby. In the case of a router going down, when this router comes back up (if the router priority is higher than the standby one) it will become the active router again, this occurs if pre-emption is enabled if it isn't the router with the lower priority will remain the active router. 

Different subnets can have active/active router interfaces - this also provides load balancing.

Commands

Configuring HSRP 
int *interface*
ip address *ip address* *subnet*
no shut
standby 1 ip *ip address* - this is where the virtual IP address would be inserted.

Configuring HSRP W/Priority and Pre-emption
int *interface*
ip address *ip address* *subnet*
no shut
standby 1 ip *ip address* - this is where the virtual IP address would be inserted.
standby 1 priority *priority number* - default number is 100. Higher for active router, lower for standby.
standby 1 preempt - this only needs to be done on side of the router interface.

Configuring HSRP W/Version 2 
int *interface*
ip address *ip address* *subnet*
no shut
standby 1 ip *ip address* - this is where the virtual IP address would be inserted.
standby version 2 - same version needs to be ran on both routers.

Verify 
show standby 




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