I had to disable spanning tree. Now it’s working. 
Hi everyone,  I have two Sonicwall NSa 4650 in cluster (Active/Passive) which I have connected to my Dell S5232F switches. The two switches are connected via VLTi. The problem is that I can't reach the Sonicwall via the Dell switches. When I run arp -a from VLAN 10 the sonicwall gateway is not visible. I basically use the fiber port on the sonicwall (X25) and give it an IP. On this port I created our VLANs which I’m trying to access. Any hint why the Sonicwall gateway is not reachable through the dell switches?  Best regards Ainder  Dell Switch Config on both Switches:  interface ethernet1/1/13:2description "FirewallLANPort"no shutdownswitchport mode trunkswitchport access vlan 1switchport trunk allowed vlan 2,10flowcontrol receive offflowcontrol transmit off Sonicwall Config: See the picture [IMAGE]  
NSA 4650 not accessible through DELL S5232F