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Nortel Networks 42C4911 manual Layer 2 Failover, Vlan Monitor

Models: 42C4911

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Alteon OS Application Guide

Layer 2 Failover

The primary application for Layer 2 Failover is to support Network Adapter Teaming. With Network Adapter Teaming, the NICs on each server all share the same IP address, and are configured into a team. One NIC is the primary link, and the other is a standby link. For more details, refer to the NetXen 10 Gb Ethernet Adapter documentation.

NOTE – Only two links per server blade can be used for Layer 2 Trunk Failover

(one primary and one backup). Network Adapter Teaming allows only one backup NIC for each server blade.

Layer 2 Failover can be enabled on any trunk group in the GbE Switch Module, including LACP trunks. Trunks can be added to failover trigger groups such that if some (or all) of the links fail in a trigger, the switch disables all internal ports in the switch (unless VLAN Monitor is turned on). When the internal ports are disabled, it causes the NIC team on the affected server blades to failover from the primary to the backup NIC. This process is called a failover event.

When the appropriate number of links in a trigger group return to service, the switch enables the internal ports. This causes the NIC team on the affected server blades to fail back to the pri- mary switch (unless Auto-Fallback is disabled on the NIC team). The backup switch processes traffic until the primary switch’s internal links come up, which takes up to five seconds.

VLAN Monitor

The VLAN Monitor allows L2 Failover to discern different VLANs. With VLAN Monitor turned on:

„If enough links in a trigger go down (see “Setting the Failover Limit” on page 219), the switch disables all internal ports that reside in the same VLAN membership as the trunk(s) in the trigger.

„When enough links in the trigger return to service, the switch enables the internal ports that reside in the same VLAN membership as the trunk(s) in the trigger.

If you turn off the VLAN Monitor (/cfg/failovr/vlan/off), only one failover trigger is allowed. When a link failure occurs on the trigger, the switch disables all internal server- blade ports.

218 „ Chapter 13: High Availability

42C4911, January 2007

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Nortel Networks 42C4911 manual Layer 2 Failover, Vlan Monitor
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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.