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switchport private-vlan host-association

Use this command to associate an interface with a secondary VLAN. Use
the no form to remove this association.
Syntax
switchport private-vlan host-association secondary-vlan-id
no switchport private-vlan host-association
secondary-vlan-id - ID of secondary (i.e, community) VLAN.
(Range: 2-4094, no leading zeroes).
Default Setting
None
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
All ports assigned to a secondary (i.e., community) VLAN can pass
traffic between group members, but must communicate with resources
outside of the group via a promiscuous port.
Example

switchport private-vlan mapping

Use this command to map an interface to a primary VLAN. Use the no
form to remove this mapping.
Syntax
switchport private-vlan mapping primary-vlan-id
no switchport private-vlan mapping
primary-vlan-id – ID of primary VLAN. (Range: 1-4094, no leading
zeroes).
Console(config)#interface ethernet 1/3
Console(config-if)#switchport private-vlan host-association 3
Console(config-if)#