Mapping Secondary Vlans To A Primary Vlan Layer 3 Vlan Interface - Cisco Catalyst 3750-E Software Configuration Manual

Chapter 16 Configuring Private VLANs
When you configure a Layer 2 interface as a private-VLAN promiscuous port, note this syntax
information:
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This example shows how to configure an interface as a private-VLAN promiscuous port and map it to a
private VLAN. The interface is a member of primary VLAN 20 and secondary VLANs 501 to 503 are
mapped to it.
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# switchport mode private-vlan promiscuous
Switch(config-if)# switchport private-vlan mapping 20 add 501-503
Switch(config-if)# end
Use the show vlan private-vlan or the show interface status privileged EXEC command to display
primary and secondary VLANs and private-VLAN ports on the switch.

Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface

If the private VLAN will be used for inter-VLAN routing, you configure an SVI for the primary VLAN
and map secondary VLANs to the SVI.
Isolated and community VLANs are both secondary VLANs.
Note
Beginning in privileged EXEC mode, follow these steps to map secondary VLANs to the SVI of a
primary VLAN to allow Layer 3 switching of private-VLAN traffic:
Command
Step 1
configure terminal
Step 2 interface vlan primary_vlan_id
Step 3
private-vlan mapping [add | remove]
secondary_vlan_list
Step 4
end
Step 5
show interface private-vlan mapping
Step 6 copy running-config startup config
OL-9775-08
The secondary_vlan_list parameter cannot contain spaces. It can contain multiple comma-separated
items. Each item can be a single private-VLAN ID or a hyphenated range of private-VLAN IDs.
Enter a secondary_vlan_list, or use the add keyword with a secondary_vlan_list to map the
secondary VLANs to the private-VLAN promiscuous port.
Use the remove keyword with a secondary_vlan_list to clear the mapping between secondary
VLANs and the private-VLAN promiscuous port.
Purpose
Enter global configuration mode.
Enter interface configuration mode for the primary
VLAN, and configure the VLAN as an SVI. The VLAN
ID range is 2 to 1001 and 1006 to 4094.
Map the secondary VLANs to the Layer 3 VLAN
interface of a primary VLAN to allow Layer 3 switching
of private-VLAN ingress traffic.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the switch startup
configuration file.
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
Configuring Private VLANs
16-13