ping lost packet

[blk]

First of all, a little schema of the problem:
computer - switch A (9308) - switch B (9304) - Switch C (4108) - switch D (2626)

MY problem is that i have a loose of packet when i ping switch C from my computer (1 on 10). If i ping every other switch on the link (A,B,D) every things working fine. Same thing in the reverse way, i have loose from D to C but nothing from D to A?B,computer. I notice that the cpu switch C jump to ~10% before packet lost.

[Mohieddin Kharnoub]

Hi

Whats the function of each switch? do you have routing enabled? do you do the ping from one Vlan to another or to the same?

Tell us little more about the scenario you have.

Good Luck !!!

[blk]

switchs 93xx are in the same vlan and use as concentration point where all vlan are routed. Switch C and D are on the same vlan and i have other vlans and switch behind switch C.To resume i have this ping problem from all switch before or after switch C except from the same vlan but only on this switch on this vlan. clear ? :|

Last week i have a dead card (3 gbic module) on switch C wich as been replace, could it be an other defected card ?, i doubt that it can occur my random ping loose.