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HSRP with Four L3 Switches

Answered Question
Nov 18th, 2008
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Can you run HSRP with four L3 switches

(1 active and 3 standbys)? How can I load balance between them? I'm assuming that that a routed connection would be required between the L3 switches correct?


thanks.

Correct Answer by Jon Marshall about 8 years 9 months ago

David


For HSRP/GLBP to work the switches need L2 adjacency. You can connect up your switches with L3 if you want but then if the switches only interconnect via L3 then HSRP/GLBP will not work.


Jon

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Jon Marshall Tue, 11/18/2008 - 12:40
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David


You can run HSRP across 4 switches if you want although the switches would need to be interconnected with a L2 link and not a routed connection as HSRP packets are contained with vlans.


If you wanted to load balance you could use MHSRP but this is not very flexible compared to GLBP. GLBP would be the choice if you wanted to load balance. Again you would need L2 connectivity between your switches -


http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.html


Jon

davidhuynh5 Tue, 11/18/2008 - 12:44
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Hi Jon,

just to understand it clearly. I would need a trunk connection not a routed connection?

Strange I was told by cisco that I could do layer 3 and not worry about layer 2. Very confusing.

Correct Answer
Jon Marshall Tue, 11/18/2008 - 12:46
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David


For HSRP/GLBP to work the switches need L2 adjacency. You can connect up your switches with L3 if you want but then if the switches only interconnect via L3 then HSRP/GLBP will not work.


Jon

royalblues Tue, 11/18/2008 - 12:45
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You can certainly run HSRP across 4 switches. All you need to make sure is that the HSRP priorities are set properly on all the routers and they all are preempting.


I totally agree with Jon to use GLBP instead of HSRP if you want to loadbalance across them


Narayan

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