Primary, Isolated, And Community Private Vlans - Cisco Nexus 6000 Series Configuration Manual

Configuring Private VLANs
• Isolated port—An isolated port is a host port that belongs to an isolated secondary VLAN. This port has
• Community port—A community port is a host port that belongs to a community secondary VLAN.
Note Because trunks can support VLANs that carry traffic between promiscuous, isolated, and community
ports, the isolated and community port traffic might enter or leave the switch through a trunk interface.

Primary, Isolated, and Community Private VLANs

Primary VLANs and the two types of secondary VLANs (isolated and community) have the following
characteristics:
• Primary VLAN—The primary VLAN carries traffic from the promiscuous ports to the host ports, both
• Isolated VLAN—An isolated VLAN is a secondary VLAN that carries unidirectional traffic upstream
• Community VLAN—A community VLAN is a secondary VLAN that carries upstream traffic from the
to more than one promiscuous port, as long as the promiscuous port and secondary VLANs are within
the same primary VLAN. You may want to do this for load-balancing or redundancy purposes. You can
also have secondary VLANs that are not associated to any promiscuous port.
A promiscuous port can be configured either as an access port or as a trunk port.
complete isolation from other ports within the same PVLAN domain, except that it can communicate
with associated promiscuous ports. PVLANs block all the traffic to isolated ports except traffic from
promiscuous ports. Traffic received from an isolated port is forwarded only to promiscuous ports. You
can have more than one isolated port in a specified isolated VLAN. Each port is completely isolated
from all other ports in the isolated VLAN.
An isolated port can be configured as either an access port or a trunk port.
Community ports communicate with other ports in the same community VLAN and with associated
promiscuous ports. These interfaces are isolated from all other interfaces in other communities and from
all isolated ports within the PVLAN domain.
A community port must be configured as an access port. A community VLAN must not be enabled on
an isolated trunk port.
isolated and community, and to other promiscuous ports.
from the hosts toward the promiscuous ports. You can configure only one isolated VLAN in a PVLAN
domain. An isolated VLAN can have several isolated ports. The traffic from each isolated port also
remains completely separate.
community ports to the promiscuous port and to other host ports in the same community. You can
configure multiple community VLANs in a PVLAN domain. The ports within one community can
communicate, but these ports cannot communicate with ports in any other community or isolated VLAN
in the private VLAN.
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
Primary, Isolated, and Community Private VLANs
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