HSRP configuration

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Apr 6th, 2009
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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....

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Giuseppe Larosa Mon, 04/06/2009 - 01:43
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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 Mon, 04/06/2009 - 02:24
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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 Mon, 04/06/2009 - 02:31
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deleted - posted twice.

Jon Marshall Mon, 04/06/2009 - 02:32
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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

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