On 2008-08-21, Henning Brauer <[EMAIL PROTECTED]> wrote: > * Insan Praja SW <[EMAIL PROTECTED]> [2008-08-21 05:25]: >> Hi Misc@, >> I Currently busting my a** to setup cizcoz catalyst 3550 to do dot1q >> tunneling over EoMPLS network. Its seem the only way to do it is to use >> this 3*50 Catalysts. But I'm curious, if I created a vlan interface over >> vlan interface on OBSD(ie, create a vlan interface over a phy_if, say vlan2 >> vlan id 2 and then create another vlan_if say vlan4 vlan id 4 over vlan2) >> does it make it compatible with sicko l2tunneling/dot1q-tunneling?. > > you can stack vlans. aka > > ifconfig vlan2 vlan 2 vlandev em0 > ifconfig vlan4 vlan 4 vlandev vlan2 >
I think you have to take a hit on MTU, so this is probably better on gigabit interfaces that are configured for jumbo frames (using ifconfig to increase MTU configures them for jumbos). Cisco does something similar (qinq) but iirc they use a different ethertype, so it may not be directly compatible. >> I wish I had a spare ports on my obsd machine so I can try this out. You could really use another machine for testing ...
