From Cisco to Fortigate via SFP

[mkanatov]

Hello everyone,

I'm new in this world, so I have a question.

I'm trying to connect Fortigate 101F to the Cisco switch via SFP ports. If I connect through the Wan1 port and put it in DHCP mode, it takes the IP address, and it's good. But when I do the same with the SFP port, it won't work. It tries to connect but no luck. 

[Toshi_Esumi]

Is L1/L2 up on the SFP port? Check "diag hard deviceinfo nic <port_name>". I was not sure what you meant by "It tries to connect...".

[ede_pfau]

At the very least you need a link LED lit. If not, reverse the fibers on one side.

FYI, there is no special handling of SFP ports on a FGT, except for the large ones (QSFP, split 40 Gbps into 4x10 etc.).

[AlexC-FTNT]

First check if the link shows up on both sides? Is FEC enabled? 

If the problem is only with the DHCP, start a packet capture before connecting the interfaces and see what data is exchanged between them:

#diag snifffer packet sfp_interface "port 67 or port 68 or port 53" 6 0