Hello! I am trying to vlan a 3548 switch so that I can put all my public-facing devices (isp router, firewall and ASA) on this switch. I cannot get the isp device to come up on the switch. I have disabled portfast, set duplex settings to 100 full, and tried both a cross-over and straight-thru to get a link light on the switch. The port is configured like this....
description Client ISP
switchport access vlan 20
I can't get a link light for anything. Any insight would be welcome.