In the paper, section 3, says > the support for GRE is essential in overcoming > the limitations VLANs face in larger deployments: the > number of available VLANs is limited (compared to the > size of many virtual environments), VLANs do not nest > well, and, as a link layer concept, VLANs do not extend > beyond LANs. > How do the support for GRE overcome the second problem?
Thanks.
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