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4-158
4
Configuring Private VLANs
Private VLANs provide port-based security and isolation between ports within
the assigned VLAN. This switch supports two types of private VLANs: primary/
secondary associated groups, and stand-alone isolated VLANs. A primary VLAN
contains promiscuous ports that can communicate with all other ports in the private
VLAN group, while a secondary (or community) VLAN contains community ports
that can only communicate with other hosts within the secondary VLAN and with any
of the promiscuous ports in the associated primary VLAN. Isolated VLANs, on the
other hand, consist a single stand-alone VLAN that contains one promiscuous port
and one or more isolated (or host) ports. In all cases, the promiscuous ports are
designed to provide open access to an external network such as the Internet, while
the community or isolated ports provide restricted access to local users.
Multiple primary VLANs can be configured on this switch, and multiple community
VLANs can be associated with each primary VLAN. One or more isolated VLANs
can also be configured. (Note that private VLANs and normal VLANs can exist
simultaneously within the same switch.)
This section describes commands used to configure private VLANs.
To configure primary/secondary associated groups, follow these steps:
1. Use the private-vlan command to designate one or more community VLANs
and the primary VLAN that will channel traffic outside of the community groups.
2. Use the private-vlan association command to map the community VLAN(s) to
the primary VLAN.
Table 4-55 Private VLAN Commands
Command Function Mode Page
Edit Private VLAN Groups
private-vlan Adds or deletes primary, community, or isolated VLANs VC 4-159
private-vlan association Associates a community VLAN with a primary VLAN VC 4-160
Configure Private VLAN Interfaces
switchport mode
private-vlan
Sets an interface to host mode or promiscuous mode IC 4-161
switchport private-vlan
host-association
Associates an interface with a secondary VLAN IC 4-161
switchport private-vlan
isolated
Associates an interface with an isolated VLAN. IC 4-162
switchport private-vlan
mapping
Maps an interface to a primary VLAN IC 4-163
Display Private VLAN Information
show vlan private-vlan Shows private VLAN information NE,
PE
4-163