As mentioned in our live coverage post at VMworld 2008’s keynote presentation, Cisco and VMware now have a partnership.
In close collaboration with VMware, Cisco has produced an intelligent software switching implementation to be run on the ESX hypervisor. It is known as the Nexus 1000V Virtual Switch. It is a powerful switching architecture providing improved security with policy based VM connections, mobile VM security, and non-disruptive networking.
To go with this, they also provide VN-Link which are virtual machine aware networking services to make sure policies move with the VM as it migrates. Here is some great information on this.
If you want to check out even more information on these exciting technologies, check out this page on Server Networking and Virtualization.

Todd:
Glad you like our efforts to date. Where do you think we should focus our efforts next with VMware?
Omar Sultan
Cisco