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It looks like the cisco plugin dynamically creates/destroys VLANs on Cisco
Nexus switches and adds appropriate trunk ports for compute hosts.  I would
imagine the goal is to avoid configuring a complex network of l2 switches
with all VLANs enabled across all switches and ports and instead maintain a
minimal configuration so that load is reduced and security enhanced.  This
would only apply for VLAN networking, not vxlan/gre tunnels.

That said, I don't have a Nexus to play with, so this is gathered from
skimming the driver source rather than hands-on testing :)


On Thu, Jun 26, 2014 at 1:59 AM, Lei Zhang <zhang.lei.fly at gmail.com> wrote:

> Recently, I am learning the neutron ml2 plugins. But I can not understand
> why the L2 physical switcher plugin(e.g. Cisco plugin) is need?
>
> In Neutron, all the packets are flow from Ethernet to another, no matter
>  what type(vlan? vxlan?) the packets are. So normally, the switcher doesn't
> configure.
> So what's the meaning and importance for the exist of L2 physical switcher
> plugins?
>
> --
> Lei Zhang
> Blog: http://xcodest.me
> twitter/weibo: @jeffrey4l
>
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>


-- 
Andrew Mann
DivvyCloud Inc.
www.divvycloud.com
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