I have a 3745 router (IOS = 12.2 (13)T that is not functioning and I have a 3725 (IOS = 12.2. (8)T5) which I am configuring to replace the 3745. When I configure a VLAN on the interface the encapsulate command returns an invalid character error. I can only guess after many retries that the problem lies with the difference in the IOS versions since the encapsulation works with the 3745. Any help would be appreciated.