Hello,

You can use subinterfaces...

intareface fa 0/1.100

encapsulation dot1q 100

ip address x.x.x.x x.x.x.x

in this case Fa0/1.100 is sitting on vlan 100 and tags all packet with vlan 100, number of the subenterface can be different number. encapsulation command defines teh vlan number.

You can do InterVlan routing with this technique or what you want...

bye

FCS

Please rate me if I helped.

I don't have a 1841 at the moment but in general , you do dot1q on routers like this:

interface f0/0

no ip address

interface f0/0.100

encapsulation dot1q 100

ip address 192.168.100.1 255.255.255.0

interface f0/0.101

encapsulation dot1q 101

ip address 192.168.101.1 255.255.255.0

Make sure the switch connected to F0/0 has dot1q trunking enabled.

You'll have to create subinterfaces on those fastE ports, and then they'll support trunking.

i.e.:

interface fastethernet0/0

no ip address

interface fastethernet0/0.10

description VLAN10

encapsulation dot1q 10

ip address ww.xx.yy.zz

etc.

HTH,

Paul

edit - I see that I got beat twice! Nevermind!