Re: Switching question

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/software/release/12.2_46_se/configuration/guide/swtunnel.html

On Fri, Oct 23, 2009 at 4:40 PM, Kleininger, Frank <
frank.kleininger_at_aacr.org> wrote:

> Interesting, I have a similar situation:
> My company often hosts meetings at convention centers and we're now setting
> up our own access routers, switches and VLANs to cut costs.
> If I'm using a 3550 as my core switch for inter-vlan routing between my
> 2960's, and the vendor is just providing me point-to-point connections
> terminating thru their various switches, there must be this additional
> configuration on their switches to allow my tagged VLAN traffic to pass,
> correct?
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Johnny B CCIE
> Sent: Thursday, October 22, 2009 10:52 PM
> To: ccielab_at_groupstudy.com
> Subject: Re: Switching question
>
> Overcomplication can lead to "under" understanding. Yes if you are
> trunked it will work. And if you don't have vlan 10 on Sw2 and are
> pruning for example or if the switch is transparent for example you
> may find that it is "not working" when technically it is working but
> you asked it to do something you did not want it to do.
>
> Solutions:
>
> Disable VTP Pruning or just don't enable it in the first place.
> Create the vlan on all three switches and verify it is there.
> Make vlan 10 pruneineligible.
>
> The other fun command part is when you can see the vlan when you
> perform a show interface vlan brief and still cannot communicate. One
> of the above will fix the problem unless you have auto and desirable
> on your ports that think they are negotiating but need a little help
> to work quite right. Change to compatible DTP types and everything
> starts to work.
>
>
> On Thu, Oct 22, 2009 at 8:27 PM, <get_ccie_at_hotmail.com> wrote:
> > Hi group,
> >
> > i have 3 switches
> >
> > SW1---SW2---SW3
> >
> > trunks are in between, ONLY SW1&3 has the VLAN 10
> >
> > now if a 2 clients in vlan 10, one on SW1 and the other on SW3 wants to
> > communicate, can they do it without creating vlan 10 on SW2 ??
> >
> > the first thought was yes, but it seems that it didn't, so any
> explanation ??
> > shouldn't this traffic be carried (VLAN 10) between SW1&3 through the
> trunk int
> > of SW2 ??
> >
> > Regards
> >
> >
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-- 
Garry L. Baker
"There is no 'patch' for stupidity." - www.sqlsecurity.com
Blogs and organic groups at http://www.ccie.net