Packet loss with VLAN in transparent mode

[#1]

Hi, I' m using a FG 200A in transparent mode to control traffic on a trunk link between 2 switch cisco catalyst 2950. 4 vlan are configured on this trunk link. If i simply connect the two switch and the FG, without setting up any vlan interface on the FG, everything works fine (with the correct policy between physical interfaces). Otherwise, if i configure the FG with vlan virtual interfaces on the external interface, and the same on the internal one, i get a lot of packet loss. Sniffing on the FG, i see that it is the FG that often doesn' t forward packets. My questions are: what configuration is correct in this context? Is it necessary to configure vlan interfaces on FG? And what is the cause of packet loss, in your opinion? Thank you p.s. Fortigate-200A 3.00,build0413 but i have the same problem with build 564

[Carl_Wallmark]

Hi, i can only speak for myself and my system, i´m using two FG200A in a HA, with 120 vlans, using Hp procurve switches, and i am not getting any packet loss, could you try with different switches ??

[paultsang]

Dear Lenh, I encounter this problem also. How do you solve this issue? Can you share with me? Thanks!