Thanks for the reply Sandy.

Basically have BGP with two ISPs configured and 12-15 virtual contexts inside of the FWSM on the 6500. Static routes route the public IPs to the approriate virtual context. In total about 30-35 VLANs in production, and all run thrugh the 6500 and ann access-layer 4500. There are bridge-groups on the 6500, and all the contexts are routed not transparent.

In a perfect world, I can build a side by side infrastructure identical to the current, with the same VLANs, and same internal IPs. The public IPs will change, and I realize that, but I would like to keep the internal infrastructure as identical as possible, as the virtual machines wil be getting closed from the current to the new infrasturcture.

Hi ,

       You can make use of Same IP address for internal LAN , Intially (until your migration completed ) you can have MAN link between datacenter connecting between 6500 of both location . Same VLAN can be extended between both location . On new location you can create appropriate L2 VLAN , Do VMotion for your VM . Then you can change gateway for those VM machine pointing to your new datacenter firewall . 

B) To avoid service outage , you can do FQDN registeration with both old & Public IP address for NATED server . 

vMotion is a vCenter operation, therefor you can only vMotion between two hosts that are managed by the same vCenter.

However within the vCenter a few limitations also exists. A virtual datacenter object is a vMotion boundary, therefor the two hosts must belong to the same datacenter within vCenter.

If you use a virtual distributed switch, both hosts must have their vMotion and VM networks connected to the same vDS. That means both hosts must connect to the same VDS with their vMotion network and the VM network on the source host must belong to the same distributed virtual switch as the destination host.

By default WAN connections with latency of 5ms or less are supported by the licenses, the enterprise plus license features Metro vMotion that has a mechanism that can sustain up to 10ms of latency. We officially do not list a minimum bandwidth requirement. I'm currently involved in getting a public statement out of the minimum required bandwidth for vMotion across WAN.

HTH

Sandy

Hi Sandy,

Thanks again for the response!

I apoligize if I wasn't too clear. I will be cloning this infrastructure within the same data-center. So I can run trunk cables local between the 6500's. Also these hosts will not be V-Motioned. We will be cloning these machines and bringing them online in the new infrastructure, so both will be online at the same time. Current and New. We will modify the new servers, and test the entire infrastructure before modifying public dns to port the names over to the new public IPs

bump for assistance.