> Test 4 > > I configure both router with sub-interfaces encapsulation QinQ(0x9100), the router's don't see each other. We have QinQ(0x9100) in production here, works fine. Note that you need a modern SFP based GigE PIC - the old fixed optic PIC don't support the settable VLAN TPID. Steinar Haug, Nethelp consulting, sthaug at nethelp.no