Re: When to do the QinQ

Noted Anthony.

Very much appreciated.

On Sat, Feb 26, 2011 at 12:30 PM, Anthony Sequeira <terry.francona_at_gmail.com
> wrote:

> Hi Jules!
>
> Great job seeing that the tunneling of Layer 2 traffic like CDP and STP is
> independent from QinQ tunneling of traffic. While the two often are used
> together, they certainly do not have to be. In the actual exam you will
> just
> want to read very carefully to see which of the two features (or both) are
> required. One clue will certainly be in what you are needing to connect as
> you pointed out. Another important thing to watch for is if the VLAN
> infrastructure is rigidly spelled out, or if you have flexibility in the
> creation of additional VLANs.
>
> Warmest regards,
>
> Anthony Sequeira, CCIE, CCSI
> StormWind's Epic Live
> http://www.stormwindlive.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> jules NYA BAWEU
> Sent: Thursday, February 24, 2011 5:16 PM
> To: Cisco certification
> Subject: When to do the QinQ
>
> Hello all,
>
> I have seen numerous tasks in R&S workbooks with regard to L2 Tunneling
> being answered with automatic QinQ config at point exit/entrance of the
> tunnel.
>
> ==========================
> system mty 1504
>
> int gi1/0/x
> switch access vlan Y
> switch mode dot1q-tunnel
> l2protocol-tunnel cdp
> l2protocol-tunnel stp
>
> int gi1/0/w
> switch access vlan Y
> switch mode dot1q-tunnel
> l2protocol-tunnel cdp
> l2protocol-tunnel stp
> ==========================
>
> Shouldn't the first task being to identify what is going to be connected at
> the entry point of the tunnel?
>
> let's say it is a L3 interface, then there is not need for the QinQ to
> bring
> up the tunnel.
>
> the above will then translate to:
> ==========================
> int gi1/0/x
> switch access vlan Y
> switch mode access
> l2protocol-tunnel cdp
> l2protocol-tunnel stp
>
> int gi1/0/w
> switch access vlan Y
> switch mode access
> l2protocol-tunnel cdp
> l2protocol-tunnel stp
> ==========================
>
> --> Now if effectively a L2 trunk is going to be connected, then the QinQ.
>
> Should I just see this type of question like "just make sure anything the
> customer connect at entry point of the tunnel should go through?"
>
> Thanks in advance
>
>
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Received on Sat Feb 26 2011 - 12:50:29 ART