Inspecting The Private Vlan Configuration - Dell S4820T Configuration Manual

• Te 1/25 is configured as a PVLAN trunk port, also assigned to the primary VLAN 4000.
• Te 1/24 and Te 1/47 are configured as host ports and assigned to the isolated VLAN, VLAN 4003.
• Te 4/1 and Te 23 are configured as host ports and assigned to the community VLAN, VLAN 4001.
• Te 4/24 and Te 4/47 are configured 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.
In parallel, on S4810:
• Te 1/3 is a promiscuous port and Te 1/25 is a PVLAN trunk port, assigned to the primary VLAN 4000.
• Te 1/4-6 are host ports. Te 1/4 and Te 1/5 are assigned to the community VLAN 4001, while Te 1/6 is
assigned to the isolated VLAN 4003.
The result is that:
• The S4810 ports would have the same intra-switch communication characteristics as described for
the Z9500.
• For transmission between switches, tagged packets originating from host PVLAN ports in one
secondary VLAN and destined for host PVLAN ports in the other switch travel through the
promiscuous ports in the local VLAN 4000 and then through the trunk ports (1/25 in each switch).

Inspecting the Private VLAN Configuration

The standard methods of inspecting configurations also apply in PVLANs.
To inspect your PVLAN configurations, use the following commands.
• Display the specific interface configuration.
INTERFACE mode and INTERFACE VLAN mode
show config
• Inspect the running-config, and, with the grep pipe option, display a specific part of the running-
config.
show running-config | grep string
The following example shows the PVLAN parts of the running-config from the S50V switch in the
topology diagram previously shown.
• Display the type and status of the configured PVLAN interfaces.
show interfaces private-vlan [interface interface]
Private VLANs (PVLAN)
775