572 Configuring VLANs
Figure 21-3 shows an example Private VLAN scenario, in which five hosts (H-
A through H-E) are connected to a stack of switches (SW1, SW2). The
switch stack is connected to router R1. Port references shown are with
reference to the stack.
Figure 21-3. Private VLAN Domain
Promiscuous Ports
An endpoint connected to a promiscuous port is allowed to communicate
with any endpoint within the private VLAN. Multiple promiscuous ports can
be defined for a single private VLAN domain.
In the configuration shown in Figure 21-3, the port connected from SW1 to
R1 (TE1/1/1) is configured as a promiscuous port. It is possible to configure a
port-channel as a promiscuous port in order to provide a level of redundancy
on the private VLAN uplink.
R1
TE1/1/1
SW1
Gi1/0/10 Gi1/0/11
Gi1/0/12
H-A H-B H-C H-D H-E
Gi2/0/10
Gi2/0/11
SW2
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