I have a problem with dot1q connection between Cisco Catalyst 4507R-E Switch (WS-X4516 - Supervisor Engine V )and Fortigate 60M firewall.
On Fortigate 60M side I configured dot1q VLANs. On Cisco side I configured trunk port on classic way:
switchport trunk encapsulation dot1q
switchport mode trunk
GigabitEthernet3/1 is down, line protocol is down
There was't a problems with similar connections (dot1q) between Fortigate 60M and other switches, and between Cisco Catalyst 4507R-E Switch and other switches.