7204 HSRP

Unanswered Question
Jul 23rd, 2007
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Hi,

I would to know if a 7204 can support hsrp within the 2 fast ethernet interfaces. E.g if fast ethernet interface 1 goes down, fast ethernet interface 2 will take over automatically.


Interface Fastethernet 0

standby 1 ip xxx.xxx.xxx.xxx

standby priority 110

standby track fastethernet 0

standby 1 preempt


Interface fastethernet 1

standby 1 ip xxx.xxx.xxx.xxx

standby priority 100

standby track fastethernet 1

standby 1 preempt


Thanks.

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Jon Marshall Mon, 07/23/2007 - 09:16
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Hi


Do you mean on the same router ? If so no as you cannot address the fa0 and fa1 interfaces out of the same subnet as you will get an "overlapping address" error message.


Jon

Amit Singh Mon, 07/23/2007 - 09:24
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Choong,


Configuration of HSRP between two interfaces on the same router is not supported and will not work. One of the restrictions in IOS is that you can not configure two active Ethernet interfaces in the same subnet. And the essence of HSRP is to have two active Ethernet interfaces in the same subnet talking to each other.


If you really want to connect two router interfaces to redundant switches and have the router interfaces back each other up, then you could try configuring bridging on both router interfaces. This would allow both interfaces to be active and Spanning Tree would provide the redundancy. To be able to route traffic from the interfaces you would need to configure IRB with a BVI interface to allow IP traffic from the router interfaces to be routed.


I would not recommend this approach, but it is the way to have both interfaces on the same router back each other up.


HTH,please rate if it does.


-amit singh


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