I have an all Dell network, using a NAC solution with dynamic vlans. I added 5 N1500 switches since the N2000 switch does well but have come up against a hard to explain problem. Clients authenticate properly, the switch sets the correct vlan but the DHCP traffic goes to the vlan 1 scope, no matter what vlan the port is in. A static port works fine; doing a release/renew once the port is set up doesn't correct the IP. I did a Wireshark capture but cannot account for the request being sent to vlan1. There are no errors on the RADIUS side or on the switch. I have tried a number of port configurations starting with the basic that works on the N2000:
spanning-tree portfast
switchport mode general
dot1x port-control mac-based
dot1x reauthentication
dot1x mac-auth-bypass
authentication order mab
authentication priority mab
The NAC vendor can find nothing wrong on their side. Any suggestions would be welcome.
