Hi,
thanks for answers. I was using officially not supported J9152A optical modules (switch logs warning, but module works). Change them to supported X240 DAC cables, but it doesn't help. My colleague found that there is strange overbalance in packets dropped by FFP on IRF conections. To be honest I'm not sure what does it mean.
display packet-drop interface
IRF 1
Ten-GigabitEthernet1/0/23:
Packets dropped by GBP full or insufficient bandwidth: 0
Packets dropped by FFP: 1352
Packets dropped by STP non-forwarding state: 0
Ten-GigabitEthernet2/0/24:
Packets dropped by GBP full or insufficient bandwidth: 0
Packets dropped by FFP: 486
Packets dropped by STP non-forwarding state: 0
IRF 2
Ten-GigabitEthernet1/0/24:
Packets dropped by GBP full or insufficient bandwidth: 0
Packets dropped by FFP: 154266
Packets dropped by STP non-forwarding state: 0
Ten-GigabitEthernet2/0/23:
Packets dropped by GBP full or insufficient bandwidth: 0
Packets dropped by FFP: 51161
Packets dropped by STP non-forwarding state: 0
I tried to disconnect IRF 2 DAC cable, but it doesn't help. Does it makes sense to try IRF on different SFP+ ports?
My next step is reset to default config. Setup IRF stack again and set only two VLANs with IPs, default gateway and do the tests again. If it fails, I will paste my full config here.
It is nice to know that Comware skilled people can help me here. Thanks a lot again!