Dell N1100-ON, Reference Manual

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Layer 2 Switching Commands
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promiscuous ports or can communicate only with the promiscuous ports
(if the secondary VLAN is an isolated VLAN).
The Private VLANs can be extended across multiple switches through inter-
switch/stack links that transport primary, community and isolated VLANs
between devices, as shown in Figure 3-1.
Figure 3-1. Private VLANs
Isolated VLAN
An endpoint connected over an isolated VLAN is allowed to communicate
with endpoints connected to promiscuous ports only. Endpoints connected to
adjacent endpoints over an isolated VLAN cannot communicate with each
other.
Community VLAN
An endpoint connected over a community VLAN is allowed to communicate
with the endpoints within the community and can also communicate with
any configured promiscuous port. The endpoints which belong to one
community cannot communicate with endpoints which belong to a different
community or with endpoints connected over isolated VLANs.