I have a basic question about multilayer switching and routed ports / Intervlan routing.
I know that I can setup a vlan 100 and 200 interface, and have switchport trunks trunking both vlans from another switch.
With ip routing enbled, the 3550 will do intervlan routing.
Now, what if I have routed ports.
Say I have 2 ports, 10.1.100.1 and 10.1.200.1 corrosponding to the 2 vlans.
Now, on a router, I could create sub-interfaces, set encapsulation and accept trunks from other switches
to do inter-vlan router on a stick.
SO the question is, do ROUTED PORTS on a 3550 always UNTAGGED ?
Once you configure a physical interface as routed port, it does not belong to any VLAN. So, for example, if you connect fa 0/24 to VLAN 10, then it becomes a host on VLAN 10. As far as traffic within the switch is concerned, it will go untagged from the individual layer 3 ports to the routed port (just like a router). So, no question of tagging when you configure the routed ports.
Hope this helps.