Alteon OS Application Guide

Port-based vs. Protocol-based VLANs

Each VLAN supports both port-based and protocol-based association, as follows:

„The default VLAN configuration is port-based. All data ports are members of VLAN 1, with no PVLAN association.

„When you add ports to a PVLAN, the ports become members of both the port-based VLAN and the PVLAN. For example, if you add port EXT1 to PVLAN 1 on VLAN 2, the port also becomes a member of VLAN 2.

„When you delete a PVLAN, it’s member ports remain members of the port-based VLAN. For example, if you delete PVLAN 1 from VLAN 2, port EXT1 remains a member of VLAN 2.

„When you delete a port from a VLAN, the port is deleted from all corresponding PVLANs.

PVLAN Priority Levels

You can assign each PVLAN a priority value of 0-7, used for Quality of Service (QoS). PVLAN priority takes precedence over a port’s configured priority level. If no priority level is configured for the PVLAN (priority = 0), each port’s priority is used (if configured).

All member ports of a PVLAN have the same PVLAN priority level.

PVLAN Tagging

When PVLAN tagging is enabled, the switch tags frames that match the PVLAN protocol. For more information about tagging, see “VLAN Tagging” on page 80.

Untagged ports must have PVLAN tagging disabled. Tagged ports can have PVLAN tagging either enabled or disabled.

PVLAN tagging has higher precedence than port-based tagging. If a port is tag enabled (/cfg/port x/tag), and the port is a member of a PVLAN, the PVLAN tags egress frames that match the PVLAN protocol.

Use the tag list command (/cfg/l2/vlan x/pvlan x/taglist) to define the com- plete list of tag-enabled ports in the PVLAN. Note that all ports not included in the PVLAN tag list will have PVLAN tagging disabled.

88 „ Chapter 3: VLANs

42C4911, January 2007

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Nortel Networks 42C4911 manual Port-based vs. Protocol-based VLANs, Pvlan Priority Levels, Pvlan Tagging
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42C4911 specifications

Nortel Networks 42C4911 is a key hardware component designed to meet the needs of modern telecommunications infrastructure. As part of Nortel's extensive portfolio, the 42C4911 has made a significant impact on network design and operation, particularly in enterprises requiring reliable and efficient communication solutions.

One of the standout features of the 42C4911 is its modularity. This allows for flexible configurations and upgrades, enabling organizations to adapt to changing technology requirements and business demands. The design philosophy behind the 42C4911 emphasizes scalability, allowing users to start with a basic setup and expand it as their networking needs grow. This feature is particularly appealing to medium and large enterprises that anticipate increased data and communication requirements over time.

In terms of technology, the 42C4911 supports various telecommunications standards, making it versatile for multiple applications. It typically integrates with other Nortel equipment and can work with third-party devices, ensuring seamless interoperability across different platforms. This is critical as organizations look to create unified communications systems that can handle voice, data, and video traffic efficiently.

The 42C4911 is known for its robust performance and reliability. It is designed to operate continuously under demanding conditions, which is essential for organizations that rely on constant connectivity for their operations. Its built-in redundancy features help safeguard against potential failures, thus enhancing the overall stability of the network. This reliability is further complemented by Nortel's commitment to high-quality manufacturing standards, ensuring that users receive a durable and efficient product.

Security is another major consideration for any networking device, and the 42C4911 provides advanced security features to protect sensitive data. With increasing cybersecurity threats, organizations prioritize devices that offer strong encryption and access control mechanisms. The 42C4911 addresses these needs while facilitating secure communication channels for users, which is essential in today's increasingly interconnected world.

Overall, the Nortel Networks 42C4911 stands out as a versatile and powerful component in the telecommunications landscape. Its modular design, compatibility with diverse technologies, reliability, and emphasis on security make it an appealing choice for organizations looking to enhance their networks. As companies continue to navigate the complexities of communication, devices like the 42C4911 play a crucial role in ensuring that they remain connected and efficient.
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