[c-nsp] Same IP on two interfaces?

[Afsheen Bigdeli]

Hi,

You may want to investigate HSRP or GLBP for this depending your needs. 
(It sounds like HSRP would do the trick nicely for you, and it's very 
easy to configure and troubleshoot - downside for both solutions is that 
you'd need three IP addresses, one for the VIP and one real address for 
each interface.)

With HSRP, the VIP would be active on one interface and fail over when 
the interface went down (or when an object you were tracking went down); 
likewise for GLBP, except that the VIP would be active on _both_ at the 
same time. So the question is whether you need primarily redundancy or 
load balancing.

HSRP:
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/cs009.htm

GLBP:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t15/ft_glbp.htm

Thanks,
--afsheenb

Vincent De Keyzer wrote:
> Hi list,
> 
>  
> 
> is it possible to have the same IP on two interfaces ?
> 
>  
> 
> The scenario is the following: router is connected via Fa0/0 to sw0, and via
> Fa0/1 to sw1 (sw0 and sw1 are interconnected). 
> 
>  
> 
> IP X.Y.Z.100 should belong to both interfaces: if sw0 or sw1 fails, router
> should still be reachable.
> 
>  
> 
> Vincent
> 
>  
> 
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