Cisco – Link Aggregation between DELL PC2724 and Cisco Catalyst 3750

ciscodelllacplagswitch

I'm trying to configure Link Aggregation between my two switches, on the DELL switch, there is only an option to include a port in a "LAG Group." On the Cisco's I've tried creating an EtherChannel group with "Dynamic Desirable" (set to negotiate). I have also tried to setup the ports as 802.11Q as well as ISL Link (both with same results)

When I plug in the cables, I can see that the links come up for each individual port, but the trunk does not.

I can see the status of each individual "port" on the Cisco as well as the EtherChannel group from the Cisco and each of the individual ports show status "stand-alone."

The lights on the Cisco switches start orange (normal) and eventually go to green, but I cannot get any traffic across the cross-connect. If I remove all "configuration" and use a single cable, everything works fine. I'm trying to get some additional speed with the LAG.

Any thoughts on what I should try?

Best Answer

http://accessories.dell.com/sna/PopupProductDetail.aspx?sku=P2741NP says that it supports LACP, so that's what we should try go with. I would set the config on the cisco:

int g1/1
channel-group 1 mode active

and then int-portchannel 1 and set your trunking there - but let's get the LACP working first.

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