I am connecting a cisco 1721 to a adsl line in (Paris).I have asked the ISP for any router configuration options to input into the router? But the ISP have said there is no need as the cisco router will work?Has anyone done this before and if so what...

I'm trying to configure my router (2621) for vlan routing.I'm following instructions from cisco press.create a subinterface "int f0/0.1"then "encap isl 1" for example but my router does not understand the encap commandmy ios software is 12.1(3r)t2can...