Re: Router on a stick

Hi,

Looking at the breakout switch config fragment posted, l2protocol
tunnelling was enabled only on the real switch facing interface (fa0/9)
anyway with nothing on fa0/48, so possible CDP/VTP/STP frames are being
encapsulated from SW2 Fa0/6 but not doing anything useful since there's no
other end to attempt to encap/de-encap those frames.

L2protocol tunnelling through the breakout switch wont do anything for
Nadeem anyway (platform limitation) but it would be quite helpful if it
worked to enable his routers to see the "real switches" via STP/CDP as
directly adjacent devices for some labs. The 3550/3560 don't support
l2protocol tunelling on trunk interfaces (Fa0/48 facing the dynamips box)
but I believe the 3750 does.

Cheers.
Adam

On Fri, Nov 9, 2012 at 3:39 AM, marc edwards <renorider_at_gmail.com> wrote:

> First off, you don't need to l2tunnel protocol anywhere to do Q in Q.
>
> Second, you need to increase the system mtu on switches for additional
> dot1q frame size
>
> Third, (with relation to Q in Q)
>
> access ports need ONLY this
>
> switchport access vlan 109
> switchport mode dot1q-tunnel
>
>
> trunk between switches only require that the vlan is allowed. or
> create access ports on same vlan between switches.
>
> HTH
>
> Marc
>
>
>
> On Thu, Nov 8, 2012 at 7:51 AM, Marko Milivojevic <markom_at_ipexpert.com>
> wrote:
> > What happened when you tried?
> >
> > --
> > Marko Milivojevic - CCIE #18427 (SP R&S)
> > Senior CCIE Instructor - IPexpert
> >
> > On Thu, Nov 8, 2012 at 1:40 AM, M Nadeem Anjum <nadeemkool_at_yahoo.com>
> wrote:
> >> Dear Experts,
> >>
> >> Can I perform "Router on a Stick" scenario using Dynamips/Dynagen
> Q-in-Q configuration using 4 real switches and 1 breakout switch.
> >>
> >> All switches are c3550.
> >>
> >> Thanks,
> >> Nadeem Anjum
> >>
> >>
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Received on Fri Nov 09 2012 - 11:19:00 ART