[c-nsp] PVLAN

Rubens Kuhl Jr. rubensk at gmail.com
Thu Sep 29 09:56:57 EDT 2005

The later: policy enforcement. PVLAN breaks the paradigm that every
port on a VLAN can communicate with each other; on a PVLAN, isolated
(Cat 4k/6k) or protected (Cat 29xx) ports can't talk to other
isolated/protected ports, only to promiscuos ports. Router uplinks are
usually connected to promiscuos ports, servers to isolated ports.

Higher-end switches like Cat4k or Cat6k have communities where you can
specify some isolated ports to talk to the other isolated ports on the


On 9/29/05, Tiffany Snyder <tiffany.snyder at gmail.com> wrote:
> Hi,
>  I'm trying to understand what PVLAN offers. Is it the same as stacked VLAN
> tagging? Or is it just a means to enforce some policy at layer 2 (ie,
> VLANs). Any explanation in laymen terms.
>   Thanks,
>   Tiffany.
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