From: Dillon Yang (dillony@gmail.com)
Date: Fri May 13 2005 - 10:04:38 GMT-3
Hi, Tim:
Do you mean that the link between cat and rt is dot1q trunk?
regard
dillon
On 5/13/05, ccie2be <ccie2be@nyc.rr.com> wrote:
> Fallback Bridging won't work for this scenario.
>
> Brian posted the solution to this problem yesterday.
>
> To get this to work, you have to configure different native vlans on the
> trunk connecting the 2 3550's and disable stp and prevent the different
> native vlan from being pruned.
>
> Tim
>
> -----Original Message-----
> From: Dillon Yang [mailto:dillony@gmail.com]
> Sent: Friday, May 13, 2005 8:48 AM
> To: ccie2be
> Cc: Group Study
> Subject: Re: Same subnet, different vlans
>
> Hi, Tim:
>
> <quote>
> With fallback bridging, the switch bridges together two or more VLANs
> or routed ports, essentially
> connecting multiple VLANs within one bridge domain. Fallback bridging
> forwards traffic that the switch
> does not route and forwards traffic belonging to a nonroutable
> protocol such as DECnet.
> </quote>
> You can find this in config of c3550.
>
> HTH
> dillon
>
> On 5/13/05, ccie2be <ccie2be@nyc.rr.com> wrote:
> > Hey guys,
> >
> > I'm stumped on this one.
> >
> > Here's the scenario:
> >
> > rtr-1 ------------- Cat-1 --- Cat-2 ----------------- rtr-2
> > .2 < vlan 2 > < vlan 20> .254
> >
> > | < 192.10.1.x/24 >|
> >
> > As you can see, both routers are in the same subnet but the ports they
> > connect to are assigned to different vlan's.
> >
> > There's an 802.1q trunk connecting the Cat's.
> >
> > Broadcast traffic from rtr-1 should reach rtr-2 and vice versa.
> >
> > I thought about 802.1q tunneling and fallback bridging but neither
> approach
> > seems to work or be the right way to approach this.
> >
> > Anyone have any ideas?
> >
> > TIA, Tim
> >
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