HSRP with a single 3845

Answered Question

I have 2 4506's are Port Channeled. Today my 3845 is only connect to one of those. I'd like to use HSRP and connect the 3845 to both 4506's, that way my MPLS traffic won't have to traverse the first one to reach it's destination.


Is this possible? Can anyone point me to an article?


Thanks,

Gates

Correct Answer by Jon Marshall about 7 years 8 months ago

Gates


You can't do this because you can't have 2 ip addresses out of the same subnet on the same router.


Do this instead -


3845


int gi0/1 (connected to 4506_1)

ip address 192.168.5.1 255.255.255.252


int gi0/2 (connected to 4506_2)

ip address 192.168.5.5 255.255.255.252


4506_1


int gi0/1 (connected to 3825 gi0/1)

no switchport

ip address 192.168.5.2 255.255.255.252


4506_2


int gi0/1 (connected to 3825 gi0/2)

no switchport

ip address 192.168.5.6 255.255.255.252


then either


1) if you are running a dynamic routing protocol between the 3825 and the 4500s already the 3825 will see 2 equal cost paths to the 4500s and use them both


or


2) if you aren't running a dynamic routing protocol you can just use static routes.


Jon

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Correct Answer
Jon Marshall Fri, 08/14/2009 - 07:20
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Gates


You can't do this because you can't have 2 ip addresses out of the same subnet on the same router.


Do this instead -


3845


int gi0/1 (connected to 4506_1)

ip address 192.168.5.1 255.255.255.252


int gi0/2 (connected to 4506_2)

ip address 192.168.5.5 255.255.255.252


4506_1


int gi0/1 (connected to 3825 gi0/1)

no switchport

ip address 192.168.5.2 255.255.255.252


4506_2


int gi0/1 (connected to 3825 gi0/2)

no switchport

ip address 192.168.5.6 255.255.255.252


then either


1) if you are running a dynamic routing protocol between the 3825 and the 4500s already the 3825 will see 2 equal cost paths to the 4500s and use them both


or


2) if you aren't running a dynamic routing protocol you can just use static routes.


Jon

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