[nsp] switch default gateway question

[John Jackson]

The problem I see is, can a l2 switch have more that one IP address? A
default gateway doesn't work if it doesn't have an IP address on the same
subnet as the default gateway.  So even if you change all your default
gateways you've still have to change your IP address on your switches.

If I have misunderstood what you plan is, let me know.

John


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of gab.seun jones.ewulomi
> Sent: Monday, July 14, 2003 9:39 AM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [nsp] switch default gateway question
> 
> Hi Scooty,
> 
> Let me explain actually why I asked the question.
> 
> We are renumbering our ip addresses to a private 10 network.
> 
> We have a core router in which all our switches point their default
> gateway
> to.
> 
> The swithes are all going to be re-numbered to a 10.20/16 range and will
> have to point to the new default gateway of 10.100.50.1/16(core router new
> address)
> 
> currently the switches are on a 11/8 range and point to a the default
> gateway 11.100.50.1/8(current core router address)
> 
> Now what I have to do is to reflect the core router to this change.
> 
> What is the best way to approach this.
> 
> This is what I think. But I think the diffrent bit mask between the old
> and
> new ip address might be a problem. By the way the routing table is all
> static
> 
> 1)configure the switches with another default gateway pointing to the
> 10.100.50.1/16 the 11.100.50.1/8 will be the primary
> 2)create a secondary address on the core router for the new ip address
> 10.100.50.1/16
> 3)on our remote site routers create a floating static entry pointing to
> the
> new default GW 10.100.50.1/16. (Then remove old route when all is well
> later
> on)
> 4)slowly start migrating the PC's on each lan to be pointing to the
> 10.100.50.1/16 GW
> 
> Is there a better way to approach this scenario?
> 
> please any help and advice will be greatly appreciated
> 
> regards,
> seun
> 
> 
> >From: "gab.seun jones.ewulomi" <seun_ewulomi at hotmail.com>
> >To: cisco-nsp at puck.nether.net
> >Subject: Re: [nsp] switch default gateway question
> >Date: Mon, 14 Jul 2003 12:23:20 +0100
> >
> >Hi people,
> >
> >just answered my own question.
> >
> >Yes you can by using the primary keyword
> >
> >thanks
> >
> >regards,
> >seun
> >
> >
> >>From: "gab.seun jones.ewulomi" <seun_ewulomi at hotmail.com>
> >>To: cisco-nsp at puck.nether.net
> >>Subject: [nsp] switch default gateway question
> >>Date: Mon, 14 Jul 2003 11:47:17 +0100
> >>
> >>Hi People,
> >>
> >>My apologies if this seems somewhat of a silly question.
> >>
> >>Here goes
> >>
> >>On a switch is it possible to have a switch pointing to more than one
> >>default gateway
> >>
> >>
> >>again my apologies
> >>
> >>
> >>regards,
> >>seun
> >>
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