[c-nsp] dot1q-tunneling

[Mikael Abrahamsson]

On Thu, 3 Aug 2006, Bo?tjan Fele wrote:

> If Cisco is doing Q-in-Q then Extreme is droping frames. Extreme does 
> not expect Q-IN-Q with 0x8100 ethertype. It is a sort of security 
> feature to prevent VLAN hopping, but check with Extreme gurus...

Extreme will see the Q-IN-Q packet with 0x8100 packet as a Q packet with 
the outer tag and ignore the inner tag. We have several such setups in 
production. You have to configure jumboframes though, as the q-in-q packet 
will be larger than standard.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se