I am experiencing some really odd behavior when I add another VLAN to the switch, and I am hoping someone can tell me if I am doing anything wrong or what may cause this problem. Here's the topology on how the router and switches connected and everyt...

I'm not sure what I'm doing wrong, but I am unable to ping any of my network device from the switch if I do not configure an interface Vlan on the switch. If I leave the interface Vlan XX out, I cannot ping any devices including the router from the s...