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Chapter 14
Configuring Private VLANs
Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface
If you use the private VLAN for inter-VLAN routing, you must 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
The private-vlan mapping interface configuration command only affects private-VLAN traffic that is
Note
Layer 3 switched.
When you map secondary VLANs to the Layer 3 VLAN interface of a primary VLAN, note this syntax
information:
•
•
•
This example shows how to map the interfaces of VLANs 501and 502 to primary VLAN 10, which
permits routing of secondary VLAN ingress traffic from private VLANs 501 to 502:
Switch# configure terminal
Switch(config)# interface vlan 10
Switch(config-if)# private-vlan mapping 501-502
Switch(config-if)# end
Switch# show interfaces private-vlan mapping
Interface Secondary VLAN Type
--------- -------------- -----------------
vlan10
vlan10
OL-8915-03
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 primary VLAN.
Use the remove keyword with a secondary_vlan_list to clear the mapping between secondary
VLANs and the primary VLAN.
501
isolated
502
community
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.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring Private VLANs
14-13
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