Multiple Promiscuous Ports Support in Private VLANs

Promiscuous ports are member ports of a primary VLAN. FastIron software supports associating each secondary VLAN with one or more promiscuous ports.

An isolated VLAN with member ports, when mapped to one or more promiscuous ports of the primary VLAN achieves the same forwarding behavior as that of the uplink ports in a port based VLAN (uplink-switch). The broadcast and unknown unicast traffic from a host (isolated) port is flooded to the uplink (promiscuous) ports only. Due to the hardware forwarding functionality of the private VLAN (in the supported stackable SKUs) this method of achieving the uplink port behavior achieves a better throughput than the conventional method of achieving uplink port.