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Setting up Etherchannel between 3750 and SG200

I was configuring link aggregation between a Cisco3750 and Cisco SG200 and the switched network went down just a few minutes after the port channel came on.

I rebooted the SG200 and all hosts came back up for a minute before I lost them again.

The etherchannel was between two trunking ports.

I never set link aggregation on the SG200, could that be the reason?

All machines are connected to the SG200.

The 3750 is only being used as a layer 3 device for inter vlan traffic.

Please help me figure out what happened before I try this again.

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Purple

Setting up Etherchannel between 3750 and SG200

  If you have a etherchanneled -trunked port between devices you definetly have to setup  "both " sides to use those functions  otherwise that can cause issues . 

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