I have 2 EX3400 switches that connected each other with a copper cable directly .
When I did a ping test each other via Lay2 or Lay3 interface . The latency average was around 18ms.
Also I connected a EX3400 to Cisco router (Huawei router ,Juniper EX4200 ) directly via Lay2 or Lay 3 . The latency average was around 15ms.
But when I used two EX4200 switches to do the Ping test VIA L2 & L3 . The Latency was no more than 2ms .
I don't know if this related to interface routing bridging (irb) on EX3400 .
Anyone can help me with this ? Thx