![]() Promiscuous port-A promiscuous port belongs to the primary VLAN. The types of private VLAN ports are as follows: Isolated VLANs-Ports within an isolated VLAN cannot communicate with each other at the Layer 2 level.Ĭommunity VLANs-Ports within a community VLAN can communicate with each other but cannot communicate with ports in other community VLANs or in any isolated VLANs at the Layer 2 level. The following two types are secondary VLANs within a primary VLAN: Secondary VLANs provide Layer 2 isolation between ports within the same private VLAN. The secondary VLAN ID differentiates one subdomain from another.Ī private VLAN domain has only one primary VLAN. All VLAN pairs in a private VLAN domain share the same primary VLAN. A private VLAN domain can have multiple private VLAN pairs, one pair for each subdomain. A subdomain is represented by a pair of private VLANs: a primary VLAN and a secondary VLAN. The private VLAN feature allows you to partition the Layer 2 broadcast domain of a VLAN into subdomains. Using private VLANs solves the scalability problem and provides IP address management benefits and Layer 2 security for customers. To enable IP routing, each VLAN is assigned with a subnet address space or a block of addresses, which can result in wasting the unused IP addresses and creating IP address management problems. If a user assigns one VLAN per customer, the number of customers that the service provider can support is limited. The private VLAN feature addresses two problems that users encounter when using VLANs:Įach VDC supports up to 4096 VLANs. Any VLAN network interfaces previously created on the secondary VLANs are put out-of-service. In such configurations, all secondary VLANs communicate at Layer 3 only through a mapping with the VLAN network interface on the primary VLAN. The VLAN network interface is created for the primary VLAN. In configurations that use integrated switching and routing functions, you can assign a single Layer 3 VLAN network interface to each private VLAN to provide routing. Hosts on isolated VLANs communicate only with associated promiscuous ports in primary VLANs, and hosts on community VLANs communicate only among themselves and with associated promiscuous ports but not with isolated ports or ports in other community VLANs. The secondary VLANs may either be isolated VLANs or community VLANs. Private VLANs are an association of primary and secondary VLANs.Ī primary VLAN defines the broadcast domain with which the secondary VLANs are associated. In certain instances where similar systems do not need to interact directly, private VLANs provide additional protection at the Layer 2 level. You must enable the private VLAN feature before you can configure this feature. Private VLAN community ports cannot be trunk ports. Feature History for Configuring Private VLANs - CLI Versionīeginning with Cisco NX-OS Release 5.0(2), the system supports private VLAN promiscuous trunk ports and isolated trunk ports.Additional References for Private VLANs - CLI Version.Configuration Examples for Private VLANs.Displaying and Clearing Private VLAN Statistics.Verifying the Private VLAN Configuration. ![]() Configuring a Layer 2 Interface as a Private VLAN Promiscuous Trunk Port.Configuring a Layer 2 Interface as a Private VLAN Promiscuous Port.Configuring a Layer 2 Interface as a Private VLAN Isolated Trunk Port.Configuring a Layer 2 Interface as a Private VLAN Host Port.Mapping Secondary VLANs to the VLAN Interface of a Primary VLAN - CLI Version.Associating Secondary VLANs with a Primary Private VLAN - CLI Version.Configuring a VLAN as a Private VLAN - CLI Version.Secondary and Primary VLAN Configuration.Guidelines and Limitations for Configuring Private VLANs.Licensing Requirements for Private VLANs.Virtualization Support for Private VLANs.Associating Primary and Secondary VLANs.Primary, Isolated, and Community Private VLANs.Primary and Secondary VLANs in Private VLANs.
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