am attempting to add a second public/external IP to WAN interface and NAT to static IP on existing vLAN.  I have tried several combination and not working. please confirm - to add a second IP to external interface, i simply add the IP to the existing...

I have two SG300 switches with same vLANs on each.  When I TRUNK between any port 1-48 the vLANs inter-connect fine.  When I attempt on TRUNK between port 49-51 (LINK/ACT) ports, vLAN 1 still works, but all other vLANs do not work.  What am I missing...

I have two SG300 switches with same vLANs on each.  When I TRUNK between any port 1-48 the vLANs inter-connect fine.  When I attempt on TRUNK between port 49-51 (LINK/ACT) ports, vLAN 1 still works, but all other vLANs do not work.  What am I missing...