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CHAPTER
39-1
Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
39
Configuring Private VLANs
This chapter describes how to implement private VLANs (PVLANs) on Catalyst 4500 series switches.
It also provides restrictions, procedures, and configuration examples.
This chapter includes the following major sections:
• About Private VLANs, page 39-1
• PVLAN Commands, page 39-10
• Configuring PVLANs, page 39-11
Note For complete syntax and usage information for the switch commands used in this chapter, look at the
Cisco Catalyst 4500 Series Switch Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/hw/switches/ps4324/index.html
If the command is not found in the Catalyst 4500 Command Reference, it will be found in the larger
Cisco IOS library. Refer to the Cisco IOS Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/ps6350/index.html
About Private VLANs
The private VLAN (PVLAN) feature addresses two problems that service providers face when using
VLANs:
• The switch supports up to 4094 active VLANs. If a service provider assigns one VLAN per
customer, this limits the numbers of customers the service provider can support.
• To enable IP routing, each VLAN is assigned a subnet address space or a block of addresses, which
can result in wasting the unused IP addresses, and cause IP address management problems.
To configure PVLANs, you need to understand the concepts in these sections:
• Purpose of a PVLAN, page 39-2
• PVLAN Terminology, page 39-3
• PVLANs across Multiple Switches, page 39-5
• PVLAN Modes Over Gigabit Etherchannel, page 39-8
• Private-VLAN Interaction with Other Features, page 39-8