PowerConnect B-Series FCX Configuration Guide 491
53-1002266-01
Configuring private VLANs
13
FIGURE 107 Example PVLAN network with tagged ports
Table 79 lists the differences between PVLANs and standard VLANs.
Configuration notes
• PVLANs are supported on untagged ports on all PowerConnect platforms. PVLANs are also
supported on tagged ports on the PowerConnect B-Series FCX platform only.
• Normally, in any port-based VLAN, the Dell PowerConnect device floods unknown unicast,
unregistered multicast, and broadcast packets in hardware, although selective packets, such
as IGMP, may be sent only to the CPU for analysis, based on the IGMP snooping configuration.
When protocol or subnet VLANs are enabled, or if PVLAN mappings are enabled, the Dell
3
4
21
VLAN 101
Isolated VLAN/Ports
VLAN 100
Promiscuous Ports
VLAN 102
Community VLAN/Ports
11
11
10 10
321
10 10
321
VLAN 101
Isolated VLAN/Ports
VLAN 102
Community VLAN/Ports
VLAN 101
Isolated VLAN/Ports
VLAN 102
Community VLAN/Ports
VLAN 101
Isolated VLAN/Ports
VLAN 102
Community VLAN/Ports
11
11
321
VLAN 100 - switch - switch link Ports
Switch 1 Switch 2
Switch 4
Switch 3
TABLE 79 Comparison of PVLANs and standard port-based VLANs
Forwarding behavior Private VLANs Standard VLANs
All ports within a VLAN constitute a
common layer broadcast domain
No Yes
Broadcasts and unknown unicasts are
forwarded to all the VLAN ports by
default
No (isolated VLAN)
Yes (community VLAN)
Yes
Known unicasts Yes Yes
