ICX6450-48p stack of 6 switches (one uplink port) no longer communicate with cisco layer 3 switch. It was working but just stopped. The only thing that changed was removing a port channel from the cisco and a lag from the ruckus (brocade).
Problem solved with your holp. default vlan wasnt being routed added dual-mode and all is well. Thanks for your help. The arp suggestion is what led my to the solution. Not sure of why it was working and then not...Thanks again.