Our 3560 has a routed interface on the native (untagged) VLAN 1 connected to one port. How would I also pass that VLAN through to another port, but tag it to appear as VLAN 20 on that other port?
EXPLANATION ADDED IN RESPONSE TO COMMENTS:
I have a multi-site Metro Ethernet on the untagged VLAN. Recently added a fiber link from one site to a new site that's not on the Metro. I can just use the native VLAN on the fiber, but I'd like to know if can choose to tag it.
On our Brocade/Foundry FCXs it's easy, and I hoped Cisco had an equivalent:
vlan 20 untagged e 1/1/1 tagged e 1/1/2
You might think of it as a simple form of VLAN translation.
FOLLOW-UP, ADMITTEDLY A STRETCH:
When a physical port sees VLAN 1 (untagged) and VLAN 5 (tagged), can another physical port carry the VLAN 1 traffic but tag it as VLAN 20? In another approach toward a similar end, if port A is an access port in VLAN 1 and port B an access port (untagged) in VLAN 20, can you cross-connect them w/o blowing up the switch, perhaps if you first disable cdp?