I have 3 line cards in my Cisco WS-4506-E switch. I want to add a 4th.  I'm not in front of the device at this time. Will need to make a trip. But I don't recall seeing any free physical space in my switch for more cards. The documentation says I can...

My ISP is going to be giving us mpls capability and told me I need to create sub interfaces for my WAN. One is for the regular traffic and the other for MPLS.  I'm not 100% sure if I have the configuration correct.  I'm looking for a second opinion....