RE: VLAN over switch routed port (WAN)

From: Lora Ganeva (lganeva@mobiltel.bg)
Date: Wed Dec 12 2007 - 19:41:09 ART


With the same success, you can define interface vlan X on both switches and
make the ports access.

Rgrds,
Lora

________________________________

From: nobody@groupstudy.com on behalf of Carlos Trujillo Jimenez
Sent: Wed 12/12/2007 1:49 AM
To: kim.teu@gmail.com; subodh.rawat@wipro.com
Cc: ugwuadu@gmail.com; ccielab@groupstudy.com
Subject: Re: VLAN over switch routed port (WAN)

yeah, but if he enable fas0/1 of both switches as access ports belonging
both to the same vlan, he LOOSES the network 10.10.10.0/30 between both
switches,and if those switchports are doing routing, with expanding the vlan
YOU ALSO LOOSE THE ROUTING SUBNET PRESENT BETWEEN BOTH SWITCHES.

I have an alternative solution.

What about enabling IRB between both switches, thus expanding VLAN A between
both switches, and also, using the already present 10.10.10.0/30 network?
THUS NOT LOOSING THE ROUTING BETWEEN BOTH SWITCHES.

First of all make sure if both switches support IRB.

FOR SW1

int vlanX (VLAN A)
bridge-group 1

int fas 0/1
bridge-group 1

int bvi 1
ip address 10.10.10.1 255.255.255.252
ip address x.x.x.x x.x.x.x secondary (VLAN A SUBNET)

FOR SW2

int vlanX (VLAN A)
bridge-group 1

int fas 0/1
bridge-group 1

int bvi 1
ip address 10.10.10.2 255.255.255.252
ip address x.x.x.x x.x.x.x secondary (VLAN A SUBNET)

with this configuration you have EXTENTED VLAN A SUBNET without loosing the
routing subnet between both switches.

>From: "Kim teu" <kim.teu@gmail.com>
>X-OriginalArrivalTime: 10 Dec 2007 21:55:47.0584 (UTC)
>FILETIME=[6BCD9000:01C83B77]
>
>Yup. Just make fa0/1 of both switches in VLAN-A would not introduce
>addition
>trunking encapsulation overhead.
>
>On 12/10/07, subodh.rawat@wipro.com <subodh.rawat@wipro.com> wrote:
> >
> > Try to make f0/1 of Switch 1&2 as access port with same vlan, VLAN-A.
> >
> > Subodh
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > henro
> > Sent: Monday, December 10, 2007 1:29 PM
> > To: ccielab@groupstudy.com
> > Subject: VLAN over switch routed port (WAN)
> >
> > Hi All,
> >
> > I have the following scenario
> >
> >
> > VLAN-A
> > =====SW1-f0/1==============================SW2-f0/1==========VLAN-A
> > 10.10.10.1/30
> > 10.10.10.2/30
> >
> > How can I extend VLAN-A across the WAN link between SW1 and SW2 as shown
> > above without introducing overhead.
> >
> > Thank you.
> >
> > Henro
> >
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