CLI Guide

Layer 2 Switching Commands 859
traffic of multiple primary VLANs towards the upstream router as well as
the traffic for regular VLANs.
• Isolated trunk port
Isolated trunk ports carry tagged traffic of multiple secondary (isolated)
VLANs and regular VLANs to and from downstream devices that are
private VLAN unaware. Downstream devices connected to isolated trunk
ports communicate with the private VLAN aware switches using isolated
VLANs and normal VLANs. Isolated trunk ports may be part of multiple
private VLANs.
• Host port
Belongs to a secondary VLAN and depending upon the type of secondary
VLAN can either communicate with other ports in the same community
(if the secondary VLAN is the community VLAN) and with the
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.