Need Help for Ethernet Passthrough on m1000e Network Connectivity problem to external switch.

Hi  All,

 I have a Blade Chasis M1000e  populated with 10 M600 Blade Servers Modules.

in A1 I/o Slot Eth Passthrough Switch is connected & in A2 I/o Slot switch is connected.

this eth passthrough and switch is connected to same 100Mbps external switch. ( no problem with switch module -A2)

If link goes down in ethernet Passthrough module it's not  reconnected automatically (once connectivity is back) and no Link led nor Status Led will glow.

both in external switch and server port is set to Auto Negotiation.

If i reconnect the ethernet module, port will work but getting downtime of chassis is to Hard.

and if I connect 1000mbps switch link and connectivity will come and also it works.

I updated Firmware also.

Can any body help me ..................?