[c-nsp] System MTU on trunks for Q in Q

[Darryl Dunkin]

I tend to run into this table often and has been a good reference for
me.

This table relates specifically to system MTU:
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note
09186a00801350c8.shtml#topic2 

This would suggest 'system mtu 1504' would be appropriate.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Dan Armstrong
Sent: Wednesday, March 26, 2008 16:02
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] System MTU on trunks for Q in Q

I've been bashing my head against the wall all day for a definitive 
answer on this:

On a Cisco switch that supports QinQ (3550, 3750, ME3400, 3560 etc)


What is the _minimum_ value I need to set the system MTU to, to do 
QinQ?  1504?  1522?  1526?  1546?

I can't seem to find one concise answer...


Thanks!!







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