Configuring Private VLANs

Secondary and Primary VLAN Configuration

template is configured, use the sdm prefer default global configuration command to set the default template.

Secondary and Primary VLAN Configuration

Follow these guidelines when configuring private VLANs:

•If the switch is running VTP version 1 or 2, you must set VTP to transparent mode. After you configure a private VLAN, you should not change the VTP mode to client or server. VTP version 3 supports private VLANs in all modes.

•With VTP version 1 or 2, after you have configured private VLANs, use the copy running-config startup config privileged EXEC command to save the VTP transparent mode configuration and private-VLAN configuration in the switch startup configuration file. Otherwise, if the switch resets, it defaults to VTP server mode, which does not support private VLANs. VTP version 3 does support private VLANs.

•VTP version 1 and 2 do not propagate private-VLAN configuration. You must configure private VLANs on each device where you want private-VLAN ports unless the devices are running VTP version 3.

•You cannot configure VLAN 1 or VLANs 1002 to 1005 as primary or secondary VLANs. Extended VLANs (VLAN IDs 1006 to 4094) can belong to private VLANs.

•A primary VLAN can have one isolated VLAN and multiple community VLANs associated with it. An isolated or community VLAN can have only one primary VLAN associated with it.

•Although a private VLAN contains more than one VLAN, only one Spanning Tree Protocol (STP) instance runs for the entire private VLAN. When a secondary VLAN is associated with the primary VLAN, the STP parameters of the primary VLAN are propagated to the secondary VLAN.

•You can enable DHCP snooping on private VLANs. When you enable DHCP snooping on the primary VLAN, it is propagated to the secondary VLANs. If you configure DHCP on a secondary VLAN, the configuration does not take effect if the primary VLAN is already configured.

•When you enable IP source guard on private-VLAN ports, you must enable DHCP snooping on the primary VLAN.

•We recommend that you prune the private VLANs from the trunks on devices that carry no traffic in the private VLANs.

•You can apply different quality of service (QoS) configurations to primary, isolated, and community VLANs.

•Note the following considerations for sticky ARP:

◦Sticky ARP entries are those learned on SVIs and Layer 3 interfaces. These entries do not age out.

◦The ip sticky-arpglobal configuration command is supported only on SVIs belonging to private VLANs.

◦The ip sticky-arpinterface configuration command is only supported on:

◦Layer 3 interfaces

◦SVIs belonging to normal VLANs

◦SVIs belonging to private VLANs

 

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WSC2960XR48FPSI specifications

The Cisco WSC2960XR48FPSI is an advanced, high-performance switch that plays a vital role in today's enterprise networking environments. Designed for reliability and efficiency, it serves as a foundational component for organizations concentrating on network agility and scalability.

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To summarize, the Cisco WSC2960XR48FPSI is an exemplary model of reliability, scalability, and performance. Its sophisticated features, including high port density, advanced security measures, and energy efficiency, make it a cornerstone for modern enterprise networks, enabling organizations to adapt effectively in an ever-evolving digital landscape.
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