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rmatt
rmatt
New Member
August 25, 2016
Question

Fortigate 300 D and Cisco 3750X SFP connection

  • August 25, 2016
  • 1 reply
  • 9368 views

Hello All,

 

I'm trying to connect the 300D to a Cisco 3750x to the SFP ports. It has this module C3KX-NM-10G which allows for 2 10GB or 4 1GB connections. G1 is in use and working. I'm using a twinax cable to make the connection, SFP-H10GB-CU1M=. If i plug it into G2 (cisco) and port5 (300D) I get link light on the 300D but not the Cisco. If I put it in G3, I get port error disabled on the Cisco side, usually this is due to a duplex or speed mismatch but I can't force a speed or duplex on these module SFP ports. I have tried setting this up as a trunk line and as just regular access, also tried assigning it an independent IP nothing seems to change. Is the twinax cable the problem or is it a config issue on either side? Anyone else have the 300d working with a twinax cable?

 

Thanks

1 reply

MrSinners
MrSinners
New Member
August 26, 2016

There are two things that are odd about this, first the usage of a 10GB cable and SFP's, while the 300D only has 1GB ports. Secondly, speed is something that can be set to a fixed speed on the FG or did you mean the switch where it is not possible to set?

 

Also, sometimes other vendor SFP's do not work on a FortiGate and is not recommended as a best practice. I have seen Cisco and Checkpoint SFP's work in a Fortigate, but also a few Cisco SFP's that did not work.

ede_pfau
SuperUser
ede_pfau
SuperUser
August 26, 2016

In my experience the FGT SFP or SFP+ ports do not auto-negotiate speed (duplex always is full duplex with fiber). Try to nail it to 1000M, even if the Cisco doesn't support fixed speed on these ports (really?).

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