Configuring Private VLANs

Private VLAN Interaction with Other Features

A feature of private VLANs across multiple switches is that traffic from an isolated port in switch A does not reach an isolated port on Switch B.

Figure 7: Private VLANs Across Switches

Because VTP does not support private VLANs, you must manually configure private VLANs on all switches in the Layer 2 network. If you do not configure the primary and secondary VLAN association in some switches in the network, the Layer 2 databases in these switches are not merged. This can result in unnecessary flooding of private VLAN traffic on those switches.

Private VLAN Interaction with Other Features

Private VLANs and Unicast, Broadcast, and Multicast Traffic

In regular VLANs, devices in the same VLAN can communicate with each other at the Layer 2 level, but devices connected to interfaces in different VLANs must communicate at the Layer 3 level. In private VLANs, the promiscuous ports are members of the primary VLAN, while the host ports belong to secondary VLANs. Because the secondary VLAN is associated to the primary VLAN, members of the these VLANs can communicate with each other at the Layer 2 level.

In a regular VLAN, broadcasts are forwarded to all ports in that VLAN. Private VLAN broadcast forwarding depends on the port sending the broadcast:

•An isolated port sends a broadcast only to the promiscuous ports or trunk ports.

•A community port sends a broadcast to all promiscuous ports, trunk ports, and ports in the same community VLAN.

•A promiscuous port sends a broadcast to all ports in the private VLAN (other promiscuous ports, trunk ports, isolated ports, and community ports).

Catalyst 2960-XR Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX1

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Cisco Systems WSC2960XR48FPSI manual Private Vlan Interaction with Other Features
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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.

One of the standout features of the WSC2960XR48FPSI is its ability to support 48 Gigabit Ethernet ports, facilitating high-speed connectivity across multiple devices. This capacity makes it an ideal choice for enterprises that require robust network infrastructure to handle large volumes of traffic effortlessly. Additionally, it includes two 10-Gigabyte SFP+ uplink ports, providing enhanced bandwidth for backbone connections, enabling seamless integration with data center environments.

The switch supports Cisco's StackPower technology, which allows multiple switches to share power resources. This capability not only provides redundancy but also ensures that organizational networks can be efficiently managed, reducing operational costs by utilizing power resources wisely.

In terms of reliability, the WSC2960XR48FPSI offers a fanless design, making it an optimal choice for deployments in noise-sensitive environments such as classrooms or offices. Its features include support for Cisco's FlexStack-Plus technology, which allows for easy stacking of up to eight units. This results in simplified management and increased bandwidth as switches in the stack operate as a single entity.

The switch is powered by Cisco IOS Software, providing robust features, including advanced security protocols, quality of service (QoS) capabilities, and comprehensive network management tools. With support for multicast routing and enhanced security, organizations can safeguard their data while ensuring smooth and reliable communication across applications.

Moreover, the Cisco WSC2960XR48FPSI is designed to be energy-efficient, compliant with IEEE 802.3az Energy Efficient Ethernet standards, which aids in reducing power consumption without sacrificing performance. This commitment to sustainability makes it a favorable option for organizations striving for greener operations.

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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