ProCurve Switch 4204vl (J8770A) - Traffic Usage "mirrored" on all ports belonging to same Vlan

[Rootek]

As its my first post, Welcome

Firstly,

- forgive if i am not providing all useful data, I'll include as necessary/requested. Quite complex to briefly describe at once.

- I am not claiming that described behaviour comes from the switch ( but can't excluded that ), i am asking for help to isolate/track its cause ;-)

- two ProCurve Switch 4204vl (J8770A) linked by two ports in trunk

- Several vlans configured

- for simplicity i will focus on one Sw.

- i attached image explaining test and its result

i noticed that some ports on Switch1 behavies very similar to each other and i run dump test:

- i am connected to (other swicth ) behind port B5 (vlan1) and downloading 4 GB file from server behing port A14 (vlan2)

- i can see that traffic utilization at this moment increase on other ports that belongs to vlan of server that i am downloading the file

- as in attached image before starting test - low ports utilization, after starting copy - at once other ports utilization "jumps". ( clearly to notice on last screen when copy is interrupted )

- i repeat similar test and each time same result ( also when i am connected directly to HP port in vlan1 )

- i am not aware when this issue started to appear so i am not able to relate it with changes applied to topology

All ports that are jumping belongs to the same vlan. When i am connected to same vlan as server (vlan2) only the peers port are utilized. Traffic between ports inside vlan2 is reflected only on peer ports.

can you please help me how to track it down? What can cause such irratic behavior ?

p.s forgot to mention most important - both vlans are splitted via Fw ISA server