Dell PowerConnect 5548 User Guide - Page 487

Private VLAN Private VLANs (PVLANs) provide Layer 2 isolation between ports that share the same Broadcast domain, or in other words, they create a point-to-multipoint Broadcast domain. The ports can be located anywhere in the Layer 2 network, as opposed to protected ports which must be in the same stack. The switch ports can be members of a Private VLAN (PVLAN) in the following membership types: • Promiscuous ports that can communicate with all ports of the same PVLAN, including the isolated ports of the same PVLAN. • Isolated ports that have complete Layer 2-isolation from the other ports within the same PVLAN, but not from the promiscuous ports. Isolated ports can communicate with promiscuous ports. The PVLAN entity is implemented by allocating the following VLANs per PVLAN: • Primary VLAN: Carries traffic from promiscuous ports. • Isolated VLAN: Carries traffic from isolated ports. Dell PowerConnect 55xx Systems User Guide 487