CHAPTER
47-1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
47
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 47-1
• PVLAN Commands, page 47-10
• Configuring PVLANs, page 47-11
Note For complete syntax and usage information for the switch commands used in this chapter, see the
Cisco IOS Command Reference Guides for the Catalyst 4500 Series Switch.
If a command is not in the Cisco Catalyst 4500 Series Switch Command Reference , you can locate it in
the Cisco IOS Master Command List, All Releases.
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 47-2
• PVLAN Terminology, page 47-3
• PVLANs across Multiple Switches, page 47-5
• PVLAN Modes Over Gigabit Etherchannel, page 47-8
• Private-VLAN Interaction with Other Features, page 47-8
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