RE: RE: Same subnet, different vlans

From: James Matrisciano (jmatrisciano@kenttech.com)
Date: Fri May 13 2005 - 08:30:52 GMT-3


Have not configured it yet, but arpa should work as well with static arp
maps from interface and ipv4 address to mac address. First choice would
be the bvi.

jm

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ptorney@satx.rr.com
Sent: Thursday, May 12, 2005 7:16 PM
To: ccie2be
Cc: 'Alvarez, Rolando [NCSUS]'; Group Study
Subject: Re: RE: Same subnet, different vlans

how about this:

bridge 1 protocol vlan-bridge

int vlan x
 brige-group 1

int vlan y
 bridge-group 1

----- Original Message -----
From: ccie2be <ccie2be@nyc.rr.com>
Date: Thursday, May 12, 2005 4:52 pm
Subject: RE: Same subnet, different vlans

> Hey Rolando,
>
> I like that idea. I can't try it though because it can't
> configure the
> ethernet interfaces on the rtr's with trunks.
>
> But, let's suppose I could do that.
>
> What would happen when a bcast frame from rtr-1 reached Cat-1?
>
> How would Cat-1 process that frame?
>
> Thanks for thinking about this.
>
> Tim
>
> _____
>
> From: Alvarez, Rolando [NCSUS] [mailto:RAlvare5@NCSUS.JNJ.COM]
> Sent: Thursday, May 12, 2005 5:31 PM
> To: 'ccie2be'
> Subject: RE: Same subnet, different vlans
>
> Tim,
> I haven't studied in a while, so I am a little rusty, but what if
> you made
> the native vlan on either side of the trunk to correspond with the
> vlan the
> router connects to. In other words, on Cat1, make vlan2 the
> native vlan of
> the trunk, and on cat2 make vlan20 the native vlan. In other
> words, let one
> vlan 'leak' in to the other. Let me know if that works.
> Rolando
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On
> Behalf Of
> ccie2be
> Sent: Thursday, May 12, 2005 5:14 PM
> To: Group Study
> Subject: Same subnet, different vlans
>
> 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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