Hi
done some testing as we had problems with this some months ago.
QinQ tunnel 1 (transport vlan 5) - outer tunnel where customer are
connected - STP,CDP (L2) forwarded
QinQ tunnel 2 (transport vlan 6) - inner SP tunnel where tunnel 1 should
be transported - STP,CDP NOT L2 forwarded
No problem with this.
But if you configure inner SP tunnel with L2 forwarding there will be
problems
QinQ tunnel 2 edge ports will see the encapsulated frames as invalid,
and err-disable the port.
Solution:
-do not enable errdisable l2pt-guard on switches where SP tunnels are
configured (probably undesired?)
or
-do not forward l2protocol on inner SP tunnel (customer will still have
their STP,CDP forwarded)
Jon Harald Bøvre
On 10.02.2011 22:31, Stevan Zupanic wrote:
Hello,
As long as you adjust your switching MTU for 4 dot1q tags, things should
work fine. We have a customer who is doing Q-in-Q on in our Q-in-Q already.
I believe (but don't quote me on this!) you can have up to 8 layer 2 dot1q
tags at once.
Stevan Zupanic
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jeff Fitzwater
Sent: Thursday, February 10, 2011 3:01 PM
To: [email protected]
Subject: [c-nsp] Q-in-Q frame sent into Q-in-Q tunnel
I have an external customer which I need to tunnel across our network, but
the traffic they are sending is QinQ already; Can I QinQ the traffic
again so that I can control the VLAN ID ?
Is my only concern the additional 4 bytes that I have to add to the MTU size
in all the switches it propagates through?
Thanks for any help.
Jeff Fitzwater
OIT Network Systems
Princeton University
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