Configuration : Link aggregate ( x1 et x2 ) to Portchannel cisco Nexus 5624Q

[Karoui1989]

Hello experts,

I have configured interfaces x1 and x2 on the FortiGate as an aggregate interface, and on the other side, a Port-Channel on a Cisco Nexus switch.

I am experiencing ping loss from the FortiGate to a specific IP address.

Could you please help me troubleshoot this?

Below is the configuration.

Switch

Firewall:

[Karoui1989]

Help Please

[ebilcari]

Is the link aggregation not working properly in general or only the communication to a single IP is affected? Are both links up and actively used (check this article)?

If this affects only a specific session, it may be caused by the LAG algorithm as explained in this article, try to change it.

[Karoui1989]

Thank you for your answer ,
the link aggregation work , but i have problem only in the communication  to a single IP is affected 
i see that fortigate use always X2 as a port , so i disabled x2 but with the X1 i still have the same problem 

[Yurisk]

Also pay attention, at least for the FortiGate-200F/201F, 400F/401F, 600F/601F models there is a known issue when traffic crosses from/to 10 Gig interfaces and 1 Gig interfaces, including packet loss. 

More info here https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Known-Issue-Decreased-Throughput-whe... 

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-troubleshoot-low-throughput-for-tra...