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Fortinet 60D's in HA Active/Active Port Channel Problem

I just recently installed two Fortinet 60D's firewalls in HA mode and set to active/active.    On both firewalls ports 6 & 7 are connected to each other for heart beat connection.    On port 5 of both firewalls they are wired into a single Cisco 2960s switch.   On the Fortinet I set port 5 as 802.3 aggerate and on the cisco side I did a port-channel for ports 47 & 48. 


What I am noticing is port 47 on cisco is showing up/up and on port 48 its showing suspended.    I have tried a couple of different configurations on the cisco side and I can not get both ports up.   


Below is my configuration from Cisco and Fortigate:



    Interface Gi 1/0/47 & 48

     Switchport mode trunk

     channel-protocol lacp

     channel-group 1 mode active


    Interface Port Channel 1

    switchport mode trunk


Cisco Switch is a WS-C2960S-48FPS-L running ver 15.2(2)E9   



config system interface edit "Port Channel" set vdom "root" set allowaccess ping https ssh http set type aggregate set member "internal5" set lldp-transmission enable set role lan set snmp-index 13 next end


Firmware:  v6.4.7 build1911 (GA)


I am open to suggestions:




New Contributor



Check LACP PDU frame interval. FG tends to send them every 1s(fast mode) and Cisco's default is usually 30s(slow mode)

Valued Contributor

That's not how FGTs in HA work (they don't act like a switch stack but more like routers using a redundancy protocol).  You need two different port channels on the Cisco side.  1 for the primary FGT and 1 for the secondary. 


At that point there's not really any point in using aggregation in the first place, but if you wanted to add a second interface to each box afterwards you could.


May need to be deployed like this:

Fortinet 60D Master  BOND1 Port6&Port7 <====> Cisco 2960s Port Channel 1 Gi 1/0/47 & 48 trunk

Fortinet 60D Backup BOND1 Port6&Port7 <====> Cisco 2960s Port Channel 2 Gi 1/0/45 & 46 trunk




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