HSRP configuration

[daredevil24]

Hi

I have two l3 switches A & B. A client router is connected to both these switches. No routing protocol will be used between the router & the two switches. ONly static routes are being used. The client router will have a static route for 172.16.x.x pointing towards the switches & static routes on both the switches towards the router.

However, since the client has asked me to run HSRP between the interfaces on the switches , i'm concerned abt the IP schema to be used. I would be greatly obliged if anybody could suggest on how to run HSRP between the interfaces in the switches connecting the router & also please suggest an IP schema that can be used....

[Giuseppe Larosa]

Hello Solomon,

the HSRP VIP consumes one ip address of the same subnet in which the the two L3 switches and the router are connected.

example:

L3SW_1 : 10.10.10.2

L3Sw_2 : 10.10.10.3

HSRP_VIP: 10.10.10.1

router_lan: 10.10.10.4

you need to accomodate at least 4 hosts so the minimum size is 255.255.255.248 for the subnet

the router has to use the HSRP VIP as its ip next-hop to be effective

Hope to help

Giuseppe

[daredevil24]

thanks for the response .....but the router has two interfaces one each connecting to both the switches. Moreover i cannot configure two interfaces in the router from the same subnet right?.......PLease help

[Jon Marshall]

deleted - posted twice.

[Jon Marshall]

Solomon

"but the router has two interfaces one each connecting to both the switches. Moreover i cannot configure two interfaces in the router from the same subnet right?."

Your'e right you can't. You could

1) bridge the 2 interfaces together on the client router. This would mean on link will be blocked by STP.

2) Use MHSRP on the switches so you can have 2 HSRP groups but this doesn't really help that much

3) Use routed links from the router to the switches. No HSRP but the client router would see 2 equal cost paths.

Personally i would go with 3.

Jon