FortiSwitch peer-consistency-check peer-config "NOT-FOUND"

[Dan_Eng52]

Hi all, 

I hope you can help me, I have a 2-Tier MCLAG setup with 4 x FSW443 and 2 x FG80 appliances. I'm having some unusual network behaviour which let me to investigate and upon running the diagnose switch mclag peer-consistency-check command on my FSW I could see that the link to my FG didn't look right as below: 

On all of my other deployments, I have checked and confirmed that these FortiLink interfaces when running the same command are OK, UP, OK and do not display the "NOT-FOUND" like this. The switches are visible, online and accessible from my FG and I have tried deleting the trunk and re-establishing but I cannot get this state to change. 

Anyone have any ideas as to what the issue may be? I'm currently running 7.4.4 FG, 7.4.3 FSW and 7.4.3 FortiAP. 

Thanks, 

Dan. 

[Dan_Eng52]

Hi all, 

I found out this is due to how the current system is patched in, rather than have a link from each firewall to each of the MCLAG-Peer switches there is two links from each firewall into the individual MCLAG-Peer switches. Therefore it is saying peer-config "NOT-FOUND" because it is local to that switch. 

I have re-patched to how I typically connect my FortiSwitches, re-run the command and the peer-consistency-check now appears OK, UP, OK. This was something that I had never come across and thought it was an issue but it isn't. 

Thanks, 

Dan.