Hi Syq
I have made some tests in this kind of topology:
________ ge-0/0/0 Main ________________________
ge-0/0/3 | |-----------------| |
Sender Iperf-| EX3200 | ge-0/0/2 Backup | L2 switch without STP |- Receiver Iperf
|________|-----------------|________________________|
With this precise config on the EX switch ( Iperf sender is 10.0.0.4 and receiver is 10.0.0.3) :
set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members INTERCO
set interfaces ge-0/0/2 unit 0 family ethernet-switching vlan members INTERCO
set interfaces ge-0/0/4 unit 0 family ethernet-switching vlan members INTERCO
set interfaces vlan unit 0 family inet address 10.0.0.1/29
set ethernet-switching-options redundant-trunk-group group TEST interface ge-0/0/0.0 primary
set ethernet-switching-options redundant-trunk-group group TEST interface ge-0/0/2.0
set vlans INTERCO l3-interface vlan.0
I tested this with Iperf sending 1000 frames per seconds and counting the number of frames lost each time I disconnected the main interface: ge-0/0/0
The results is that I had between 31 ms to 120 ms of frames lost with an average of 76 miliseconds on 7 tries.
Theses are the results of the loss during disconnection on Coper interfaces (synchronised at 100mbps) and I believe it depends on the physical type of interfaces as the time is mainly due to detection of loss of signal.
During the recovery of main interface I mainly saw no loss.
I hope that this will help you