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If you are planning to provide Vlan Stacking over a sub-interface, to preserve the customers VLAN ID, you will have to configure QinQ on the subinterface like so:interface gigabitethernet3/0.1encapsulation dot1q 50 second-dot1q 10xconnect 4.4.4.4 100...
Hi Mazlan,By routed VLANs I mean SVIs which you can create on Layer3 switches. so lets port 1 is a member of vlan 10 and vlan 10 is the svi, even though you modified port 1 with MTU settings, you might want to modified the mtu on the svi as well. As ...
Do you by any chance have routed vlans along the path? if so also modify the MTU settings on those and see if it works. I have had similar problems and even though all interfaces had MTU settings modified it did not work.HTHAndy
