First off, Dell switches are compatible with Cisco switches, but due to Dell (and other vendors) choosing to follow the 802.1q standard in a different way to Cisco (they choose to allow only tagged traffic on the native VLAN, while Cisco ignores traffic for their native VLAN), this can lead to problems if you use the default VLAN(1) for management. Using the default VLAN(1) for management was something I inherited and would not recommend. I think VMware's not too keen on it either, from what I remember during installs.
In order to get the switches working together, we need to configure the Dell port-channel as a trunk, thus only allowing tagged traffic and ignoring untagged traffic.
To force the Cisco switch to send/receive VLAN1 traffic as tagged traffic you locally configure another native VLAN on the trunk-interface of the Cisco switch. On the interface, configure an unused VLAN as the local native VLAN.
Further info can be found here:
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