Basically
First create tunnel..Q in Q
Then Layer 2 protocol like CDP, STP etc will be going thru tunnel..that is
called layer 2 protocl tunnel :-).this featuer needs tunnel. WHich protocol
will be allowed through the tunnel ?.
> Date: Sat, 5 Sep 2009 15:25:01 +0200
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> Subject: Re: [OSL | CCIE_RS] QinQ Vs. l2protocol-tunnel
>
> Hi Rick,
>
> Thanks for taking the time to help out! im pulling out the remaining
> hairs on my head! :)
>
> I found the missing piece by going over the configuration i was going
> to send :)
> (I even pulled out a 2950 i was using as SW3, and replaced it with a
> 3550... just to make sure...)
>
> But if you dont mind, how is the l2protocol-tunnel different from QinQ
> (other than the packets are double tagged). From my now working
> topology, all my vlans run STP, CDP just fine... I think im missing the
> point somewhere along the path..
>
> Thanks again!
>
> Kim
>
> Rick Mur wrote:
> > Hi Kim,
> >
> > Please see my attached drawing. I configured about the same topology
> > as you did. Trunk between SW3 and SW4 and access ports to SW1 and SW2.
> > On those access ports I enabled l2-protocol-tunnel cdp and now SW1 and
> > SW2 see each other as CDP neighbor over those interfaces.
> >
> > Please show me your entire configuration if this doesn't work for you.
> > Again see attached drawing for more clarification on my topology :-)
> >
> >
> > --
> >
> > Regards,
> >
> > Rick Mur
> > CCIE2 #21946 (R&S / Service Provider)
> > Sr. Support Engineer – IPexpert, Inc.
> > URL: http://www.IPexpert.com
> >
> >
> > On Sat, Sep 5, 2009 at 1:39 PM, Kim Pedersen <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> > Hi all,
> >
> > I have been reading over
> > http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.2_44_se/configuration/guide/swtunnel.html#wp1014851
> > 10 times by now, and I am still unsure of the difference.
> >
> > I have tried to set up a lab to test some stuff out, it consists of 4
> > switches:
> >
> > SW3 is connected to SW1 and SW4.
> > SW4 is connected to SW3 and SW2
> > and SW1 and SW2 are connected.
> >
> > I want SW3 to see SW4 through SW1 and SW2. To accomplish this, i have
> > set up a vlan (13) on both SW1 and SW2, then an access port on
> > each with
> > vlan 13 is connected to SW3 and SW4 respectively. On top of this,
> > i use
> > l2protocol-tunnel on each of these interfaces. I was expecting CDP
> > traffic to flow from SW3 to SW1, through the trunk between SW1 and
> > SW2,
> > and from SW2 to SW4. But this does not happen.
> >
> > I think generally im confused between the difference between QinQ
> > and l2
> > protocol tunneling. Can someone shed some light on this or maybe point
> > me in the correct direction through some documentation apart from the
> > above Cisco Doc...
> >
> > Thanks!
> >
> > Sincerely,
> > Kim Pedersen
> >
> > --
> >
> > // Freedom Matters
> > // Follow my progress on: http://kpjungle.wordpress.com
> >
> > _______________________________________________
> > For more information regarding industry leading CCIE Lab training,
> > please visit www.ipexpert.com <http://www.ipexpert.com>
> >
> >
> >
> > ------------------------------------------------------------------------
> >
>
> --
>
> // Freedom Matters
> // Follow my progress on: http://kpjungle.wordpress.com
>
> _______________________________________________
> For more information regarding industry leading CCIE Lab training, please
> visit www.ipexpert.com
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