[c-nsp] Same IP on two interfaces?

[Vincent De Keyzer]

Thanks for all the replies.

To summarize:
* my goal is to redundantly connect the router (to other routers behind the
switch network) while using the least amount of IP addresses
* backup interface looks like an option
* HSRP/GLBP might be an option, but uses a lot of IP addresses
* Etherchannel and unnumbered Ethernet do no look like options
* VRF are not an option, as we are not running MPLS
* BVI would be an option, but the switches do not run spanning tree (these
are Foundry switches running MRP)

Thanks again,

Vincent

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Fedorov, Konstantin
> Sent: vendredi 27 octobre 2006 14:54
> To: Brant I. Stevens; InterNetX - Patrick Kaiser; cisco-
> nsp at puck.nether.net
> Subject: Re: [c-nsp] Same IP on two interfaces?
> 
> Hi,
> 
> What is the goal of this setup ??
> 
> If you configure 2 VRF's, and assign each FE to different VRF's - its
> possible have same ip addresses on the router.
> 
> Is this common subnet between this FE's ??
> If common - impossible, you  receive "duplicated address"
> 
> 
> -----------------------
> Sincerely Yours,
> Konstantin Fedorov
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Brant I. Stevens
> Sent: Friday, October 27, 2006 4:28 PM
> To: InterNetX - Patrick Kaiser; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Same IP on two interfaces?
> 
> On 10/27/06 6:06 AM, "InterNetX - Patrick Kaiser"
> <patrick.kaiser at internetx.de> wrote:
> 
> > Hi
> >
> > What about Etherchannel. Mayber this solves your problem
> 
> Etherchannel won't work, as it is one router with two interfaces
> connecting
> to two different switches (unless there is has been a new development
> allowing cross-switch Etherchannel, but I don't remember seeing anything
> like that).
> >
> >
> > Greets Patrick
> >
> >
> > On Fri, 27 Oct 2006 09:26:04 +0200
> > "Vincent De Keyzer" <vincent at dekeyzer.net> 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.
> 
> As others have said, using a BVI and bridge groups should solve this
> problem.
> 
> >>
> >>
> >>
> >> Vincent
> >>
> >>
> >>
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> >>
> >
> 
> 
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