Is it possible to use Virtual Link Trunking in a mixed Dell and Cisco environment?

Hi,

My service provider is Cisco and they provide the firewall and routers as a managed service. My internal network uses Dell Power Connect switches. In the past we had an issue where the ISP's spanning tree costs leaked onto my network and caused some network outages - I'm thinking of trying to use Dell virtual trunking protocol instead of spanning tree, but am not sure if this would be feasible in a mixed Cisco and Dell environment.

Please advise.

Thanks