[nsp] switch default gateway question

Mon Jul 14 18:17:03 EDT 2003

My apologies if I didnt explain myself properly

Basically I want to know how best to approach the situation

our switches are going to be changed to a diffirent address range. the 
switches can accept more than one default gateway.
The core routers addresses has to be changed to the same subnet as the 
switches soon

1)the switch old ip address is was on a 11/8 address pointing to the core 
router with a 11/8 address
2)now the switch addresses are being changed to a 10/16(subnetted) address 
and the default gateway has to point to the core witha 10/16 address as well

Myu approach was to

1)configure the swith with another default pointing to a 10/16
2)configure a secondary interface on the core with a 10/16 address
3)the other core routers connected to this core will be also given a 
secondary of 10/16 address
4)then on the core routers put floating statics for all our original routes 
to point to the default GW 10/16 addresses

I presume that because the swithes now have to defalt GW statements that the 
swith will automatically send packest for pc's of 10 and 11 addresses. While 
we slowly migrate all our lan devices to the new 10/16 GW

5)will start gradually changing the lan devices to start pointing to the 
10/16 GW

Please correct me if im thinking of this the wrong way.

Any advice will be greatly appreciated

regards,
seun

>From: John Jackson <jjackson at onenet.net>
>Reply-To: jjackson at onenet.net
>To: "'gab.seun jones.ewulomi'" <seun_ewulomi at hotmail.com>, 
>cisco-nsp at puck.nether.net
>Subject: RE: [nsp] switch default gateway question
>Date: Mon, 14 Jul 2003 10:22:54 -0500
>
>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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