Cisco 9300 to FortiSwitch224e

[chueymtz]

I am testing FortiSwitches on our network, I have a 224e that I am trying to trunk directly to an ethernet port on my cisco 9300. I have trunked the port on my cisco port 36 

interface GigabitEthernet1/0/36
description Uplink to Forti
switchport trunk allowed vlan 100,200,300,400,500
switchport mode trunk
spanning-tree portfast

I have this going to the FortiSwitch plugged in port 1 that we have also trunked, the issue is that as soon as I trunk the port on my Cisco, I lose access to my forti because it is unable to get an ip address, I tried setting a static ip on the port for the forti but I still am unable to get online. The address that is supposed to be assigned to the forti port one is 10.76.x.198/24 which is what the Vlan100 traffic uses. Any suggestions? Did I not correctly trunk my Cisco? Anything I plug into port 36 on the cisco is unable to pickup an ip. Thanks. I have a ticket open with FortiSwitch but they are blaming it on my Cisco.

[MHM Cisco World]

Share show interface status 

I think the port is errdisable 

MHM

[Georg Pauwen]

Hello 

this could be a spanning tree problem. Try to enable rpvst on the Fortigate (set rpvst port enable or something similar is the command on the Fortigate), and globally enable rpvst om the Cisco.

[chueymtz]

That didn’t work. Not sure if that’s the issue if I put in a dummy switch to that port I can’t get internet either