David, In the absence of VM mobility, it is easier for Overlay network to make the 12-bits VID locally significant by using core's 24 bits ID (VNID) to provide >4K's isolation.
When applications (e.g. firewall) sit on multiple subnets, those VMs Guest OSs do send VID encoded data frames. When those VMs move, the same VID used by the VMs will appear in different NVEs, making those 12-bits VID globally significant. Linda From: David Allan I [mailto:[email protected]] Sent: Tuesday, July 31, 2012 12:45 PM To: Linda Dunbar Cc: [email protected] Subject: You presentation on VM mobility... HI Linda: You said that even with a 24 bit tag in the core, VM mobility would make it difficult to genuinely achieve more than 4K VLANs.... I have to admit that flies in the face of my understanding of both tagging and scaling. Could you clarify WHY you believe this to be true? Much thanks Dave
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