[ovs-discuss] How do GRE overcome VLAN nest problem?

Justin Pettit jpettit at nicira.com
Wed Aug 18 06:10:20 UTC 2010


On Aug 17, 2010, at 8:54 PM, 陈文龙 wrote:

> 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? 

I think that was mostly related to the first point, in that nesting VLANs is generally not sufficient for overcoming the limited VLAN id space.

--Justin






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