Alteon OS Application Guide

Multiple Spanning Trees

Each GbE Switch Module supports a maximum of 128 Spanning Tree Groups (STGs). Multi- ple STGs provide multiple data paths, which can be used for load-balancing and redundancy.

You enable load balancing between two GbE Switch Modules using multiple STGs by config- uring each path with a different VLAN and then assigning each VLAN to a separate STG. Each STG is independent. Each STG sends its own Bridge Protocol Data Units (BPDUs), and each STG must be independently configured.

The STG, or bridge group, forms a loop-free topology that includes one or more virtual LANs (VLANs). The switch supports 128 STGs running simultaneously. The default STG 1 may contain an unlimited number of VLANs. All other STGs 2-128 may contain only one VLAN each.

Default Spanning Tree configuration

In the default configuration, a single STG with the ID of 1 includes all non-management ports on the switch. It is called the default STG. Although ports can be added to or deleted from the default STG, the default STG (STG 1) itself cannot be deleted from the system.

All other STGs, except the default STG 1 and the management STG 127 and STG 128, are empty and VLANs must be added by the user. However, you cannot assign ports directly to an STG. Add ports to a VLAN and add the VLAN to the STG. The default configuration of management STG 127 contains VLAN 4094 and port EXT7. The default configuration of management STG 128 contains VLAN 4095 and internal management ports MGT1 and MGT2.

Each STG is enabled by default, and assigned an ID number from 2 to 126. By default, the spanning tree on the management ports (MGT1, MGT2, and EXT7) is turned off in both STP/ PVST+ mode and in MSTP/RSTP mode.

110 „ Chapter 5: Spanning Tree Group

42C4911, January 2007

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Nortel Networks 42C4911 manual Multiple Spanning Trees, Default Spanning Tree configuration
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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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