Administrator Guide

Private VLAN Conguration Example
The following example shows a private VLAN topology.
Figure 94. Sample Private VLAN Topology
The following conguration is based on the example diagram for the Z9500:
• Te 1/1 and Te 1/23 are congured as promiscuous ports, assigned to the primary VLAN, VLAN 4000.
• Te 1/25 is congured as a PVLAN trunk port, also assigned to the primary VLAN 4000.
• Te 1/24 and Te 1/47 are congured as host ports and assigned to the isolated VLAN, VLAN 4003.
• Te 4/1 and Te 23 are congured as host ports and assigned to the community VLAN, VLAN 4001.
• Te 4/24 and Te 4/47 are congured as host ports and assigned to community VLAN 4002.
The result is that:
• The ports in community VLAN 4001 can communicate directly with each other and with promiscuous ports.
• The ports in community VLAN 4002 can communicate directly with each other and with promiscuous ports.
• The ports in isolated VLAN 4003 can only communicate with the promiscuous ports in the primary VLAN 4000.
• All the ports in the secondary VLANs (both community and isolated VLANs) can only communicate with ports in the other secondary
VLANs of that PVLAN over Layer 3, and only when the ip local-proxy-arp command is invoked in the primary VLAN.
NOTE
: Even after you disable ip-local-proxy-arp (no ip-local-proxy-arp) in a secondary VLAN, Layer 3
communication may happen between some secondary VLAN hosts, until the ARP timeout happens on those secondary VLAN
hosts.
622 Private VLANs (PVLAN)