High Availability Configurations

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GbE Switch Modules offer flexibility in implementing redundant configurations. This section discusses the more useful and easily deployed configurations:

“Active-Active Configuration” on page 233

“Hot-Standby Configuration” on page 238

Active-Active Configuration

Figure 13-7shows an example configuration where two GbE Switch Modules are used as VRRP routers in an active-active configuration. In this configuration, both switches respond to packets.

	L2 Switch	VIR 1: 192.168.1.200 (Master)
		VIR 2: 192.168.2.200 (Backup)
	1
	2	GbESM 1		NIC 1: 10.0.1.1/24
	5		Server 1	NIC 2: 10.0.2.1/24

				NIC 1: 10.0.1.2/24
InternetI t t			Server 2 NIC 2: 10.0.2.2/24
				NIC 1: 10.0.1.3/24

Enterprise	5		Server 3 NIC 2: 10.0.2.3/24

Routing Switch	1	GbESM 2		NIC 1: 10.0.1.4/24
	2		Server 4	NIC 2: 10.0.2.4/24

	L2 Switch	VIR 1: 192.168.1.200 (Backup)
	L2 Switch	VIR 2: 192.168.2.200 (Master)
		VIR 2: 192.168.2.200 (Master)

Figure 13-7Active-Active High-Availability Configuration

Although this example shows only two switches, there is no limit on the number of switches used in a redundant configuration. It is possible to implement an active-active configuration across all the VRRP-capable switches in a LAN.

Each VRRP-capable switch in an active-active configuration is autonomous. Switches in a vir- tual router need not be identically configured.

In the scenario illustrated in Figure 13-7, traffic destined for IP address 10.0.1.1 is forwarded through the Layer 2 switch at the top of the drawing, and ingresses GbESM 1 on port EXT1. Return traffic uses default gateway 1 (192.168.1.1). If the link between GbESM 1 and the Layer 2 switch fails, GbESM 2 becomes the Master because it has a higher priority. Traffic is forwarded to GbESM 2, which forwards it to GbESM 1 through port EXT5. Return traffic uses default gateway 2 (192.168.2.1), and is forwarded through the Layer 2 switch at the bottom of the drawing.

To implement the active-active example, perform the following switch configuration.

42C4911, January 2007

Chapter 13: High Availability 233

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.

Nortel Networks 42C4911 manual High Availability Configurations, Active-Active Configuration

Models: 42C4911

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