From: Joe Armah (joearmah@mindspring.com)
Date: Thu Aug 28 2003 - 17:06:08 GMT-3
You could also use Private vlans to acheive this....
-------Original Message-------
From: miken <miken@sisna.com>
Sent: 08/28/03 01:28 AM
To: emad <emad@zakq8.com>, 'Larry Letterman' <lletterm@cisco.com>, 'Gary Bartlett' <gary.bartlett@consultant.com>, ccielab@groupstudy.com
Subject: Re: Vlan design vs. subnet distribution
>
> Sure. People used to do it all the time and probably still do if they are
using hubs instead of switches or have a router that doesn't support
trunking such as a 2500 or 1600, etc.. You use secondary addresses on the
router/layer 3 interface. Poor man's VLAN.... ;-) just a joke, don't
anyone
take offense to that. But there still has to be a layer 3 IP address for
the
gateway and to be able to route between the subnets on the same VLAN.
Mike N
----- Original Message -----
From: "emad" <emad@zakq8.com>
To: "'Larry Letterman'" <lletterm@cisco.com>; "'Gary Bartlett'"
<gary.bartlett@consultant.com>; <ccielab@groupstudy.com>
Sent: Thursday, August 28, 2003 2:09 AM
Subject: RE: Vlan design vs. subnet distribution
> Exactly Larry , that was my opinion to the customer but he insisted that
> we can work around this ,anyway that is the attitude of all customers
> but I have one more question if u all please,
> Is there , from technical point of view , anyway to configure one vlans
> with two subnets?
> thanx
>
> -----Original Message-----
> From: Larry Letterman [mailto:lletterm@cisco.com]
> Sent: Thursday, August 28, 2003 11:05 AM
> To: 'emad'; 'Gary Bartlett'; ccielab@groupstudy.com
> Subject: RE: Vlan design vs. subnet distribution
>
> All the ports on all switches would be in the same vlan..since you only
> plan
> On using one subnet..having more than one vlan wont work, since there
> are no
> Subnets to assign to the other vlans..
>
> If you want to use more than one IP subnet and more than one vlan, then
> break the
> Subnet into smaller pieces and use interface vlans on the router, then
> trunk those
> Vlans to the switches and each vlan will have a different subnet and the
> L3 device
> Would route between them..and the trunks will carry all the vlan data to
> all the vlans
> Configured on each switch...
>
>
> Larry Letterman
> Cisco Systems
>
>
>
>
> -----Original Message-----
> From: emad [mailto:emad@zakq8.com]
> Sent: Thursday, August 28, 2003 12:58 AM
> To: 'Gary Bartlett'; 'Larry Letterman'; ccielab@groupstudy.com
> Subject: RE: Vlan design vs. subnet distribution
> Importance: High
>
>
> Then , I will put all sites in one subnet and different vlans , what is
> the benefit from applying vlan here at this time , and I think I should
> define vlan interfaces on the core switch and give them IPs , how can I
> put IP on a L3 device to route between and all these IPs are in the same
> subnet , or I shouldn't define vlan interfaces at all on the core ,
> Please when proposing an idea explain it in more details for me thanx
>
> -----Original Message-----
> From: Gary Bartlett [mailto:gary.bartlett@consultant.com]
> Sent: Thursday, August 28, 2003 10:51 AM
> To: emad; 'Larry Letterman'; ccielab@groupstudy.com
> Subject: RE: Vlan design vs. subnet distribution
>
>
> In a case like that you just need to setup a trunk, traffic will
> automaticly pass within the same vlan across all sites
>
> ----- Original Message -----
> From: "emad" <emad@zakq8.com>
> Date: Thu, 28 Aug 2003 10:37:27 +0300
> To: "''Larry Letterman''" <lletterm@cisco.com>, "''Gary Bartlett''"
> <gary.bartlett@consultant.com>, <ccielab@groupstudy.com>
> Subject: RE: Vlan design vs. subnet distribution
>
> >
> > The case exactly is I have three or more sites connected through edge
> > switch to the core switch (4507) through fiber links but all these
> sites
> > share the subnet 172.30.16.0 mask 255.255.248.0 , how can I implement
> > vlans between these sites with the existing subnet range right there.
> >
> > Please advice
> >
> >
> > -----Original Message-----
> > From: emad [mailto:emad@zakq8.com]
> > Sent: Thursday, August 28, 2003 10:22 AM
> > To: 'Larry Letterman'; 'Gary Bartlett'; 'ccielab@groupstudy.com'
> > Subject: RE: Vlan design vs. subnet distribution
> > Importance: High
> >
> > Larry , u didn't get my point at all
> > All these sites are connected by fiber to the core switch , all the
> > network around are flat network (one broadcast domain) no L3 routers
> in
> > between , u got it now?
> >
> > -----Original Message-----
> > From: Larry Letterman [mailto:lletterm@cisco.com]
> > Sent: Thursday, August 28, 2003 10:19 AM
> > To: 'Gary Bartlett'; 'emad'; ccielab@groupstudy.com
> > Subject: RE: Vlan design vs. subnet distribution
> >
> > I raelly don't see what vlans have to do with connecting remote
> > Sites, since most remotes are connected by routers with L3 subnets
> > Using /30 space. The most common way of connecting remotes to the main
> > Site on one subnet would be multipoint frame...
> >
> >
> > Larry Letterman
> > Cisco Systems
> >
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Gary Bartlett
> > Sent: Thursday, August 28, 2003 12:14 AM
> > To: emad; ccielab@groupstudy.com
> > Subject: Re: Vlan design vs. subnet distribution
> >
> >
> > Well, I think you were on the right track by saying that for routing
> > purpoces it wouldn't work to well if you had multiple sites
> advertiseing
> > the same subnet, unless the subnets were NATed by the router as it was
>
> > advertised to the rest of the network...
> >
> >
> > ----- Original Message -----
> > From: "emad" <emad@zakq8.com>
> > Date: Thu, 28 Aug 2003 09:59:31 +0300
> > To: <ccielab@groupstudy.com>
> > Subject: Vlan design vs. subnet distribution
> >
> > > Folks,
> > > I faced a question saying why it is necessary to dedicate one subnet
>
> > > per each vlan and not more when we are connecting , as example , two
>
> > > branch sites switches to the core switch? My answer was to how we
> can
> > > give IP to each vlan interface on the core switch to make L3 routing
>
> > > between them and at the same time we limited the boradcast traffic
> to
> > > inside the same site, but if I have three sites(one head quarter and
>
> > > other two are branches) have one subnet in between them ? Like if I
> > > have subnet 172.30.16.0 255.255.248.0 distributed between
> > the
> > > three sites , how can I make vlans without having each site
> separated
> > > into one subnet!!!
> > >
> > > Please advice
> > >
> > > thanx
> > >
> > >
> > >
> ______________________________________________________________________
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