Troubleshooting Tip: 25 Gigabit Ethernet connection between FortiGate and Cisco Nexus
Description
This article describes how to fix 25 Gigabit Ethernet connection between FortiGate and Cisco Nexus.
Scope
- FortiOS 7.2.
- FortiGate with 25 Gigabit Ethernet interface.
- FortiGate with Fortinet : FN-TRAN-SFP28-SR model to connect to Cisco Nexus via fiber optic cable.
- Cisco Nexus with 25 Gigabit Ether net interface.
- Cisco Nexus with Cisco : SFP-10/25G-CSR-S model to connect to FortiGate via fiber optic cable.
- The connection between FortiGate and Cisco Nexus can be only the single interface or a link aggregation interface.
Solution
- In this case, a FortiGate unit with 25Gigabit Ethernet interface is connected to a Cisco Nexus Ethernet interface with the default settings, but the interface is still not up for both sites.
- At the Cisco Nexus site, a user receives an error when trying to correct the settings of the 25 Gigabit Ethernet interface with the following:
fec rs-ieee
The error message:
"ERROR: FEC validation failed on ethX/Y due to incompatible configured speed or transceiver type"
(X/Y is the Cisco Nexus interface.)
The solution to fix the issue:
In FortiGate:
config system interface
edit <interface name>
set speed 25000full
set forward-error-correction c174-fc-fec
next
end
The same configuration should be performed on the Cisco Nexus side as well.
