Configuration Guide User guide

812 FastIron Configuration Guide
53-1002494-02
Private VLAN configuration
Figure 92 shows an example PVLAN network with tagged switch-switch link ports.
FIGURE 92 Example PVLAN network with tagged ports
Table 142 lists the differences between PVLANs and standard VLANs.
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 142 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