Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual
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• Primary - The primary PVLAN ports are "promiscuous". They can communicate with all the isolated
PVLAN ports and community PVLAN ports in the isolated and community VLANs that are mapped
to the promiscuous port.
• Isolated - Broadcasts and unknown unicasts received on isolated ports are sent only to the
promiscuous ports and switch - switch ports. They are not flooded to other ports in the isolated
VLAN.
NOTE
On all devices, however, private VLANs will act as a normal VLAN and will flood unknown
destinations, broadcast and multicast traffic to all ports in the VLAN if the primary VLAN does not have
the PVLAN mapping that defines the uplink port for the isolated VLAN.
• Community - Broadcasts and unknown unicasts received on community ports are sent to the
primary port and also are flooded to the other ports in the community VLAN.
Each PVLAN must have a primary VLAN. The primary VLAN is the interface between the secured
ports and the rest of the network. The PVLAN can have any combination of community and isolated
VLANs.
As with regular VLANs, PVLANs can span multiple switches. The PVLAN is treated like any other
VLAN by the PVLAN-trunk ports.
shows an example of a PVLAN network across switches:
• Broadcast, unknown unicast or unregistered multicast traffic from the primary VLAN port is
forwarded to all ports in isolated and community VLANs in both the switches.
• Broadcast, unknown unicast or unregistered multicast traffic from an isolated port in switch A is not
forwarded to an isolated port in switch A. It will not be forwarded to an isolated port in switch B
across the PVLAN-trunk port.
• Broadcast, unknown unicast or unregistered multicast traffic from a community port in switch A will
be forwarded to a community port in switch B through the PVLAN-trunk port. It is forwarded to the
promiscuous ports and PVLAN-trunk ports of the primary VLAN.
FIGURE 92 PVLAN across switches
The following figure shows an example PVLAN network with tagged switch-switch link ports.
VLANs
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FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide
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