Chapter 14 Load Balancing in the P333R-LB

Figure 14.16 Hash Metric - Loss of Persistency

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When Cache Server 2 in Figure 14.16 is removed from the group, the list of available cache servers is readjusted, causing a lack of persistency. However, if Cache Server 2 becomes operational again, the list of available cache servers is restored to its original order, and persistency is recovered.

MinMiss Hash

The default metric parameter for MinMiss Hash in AR is the Destination IP address.

MinMiss distributes sessions to cache servers in the same way as the Hash metric. However, MinMiss Hash sustains persistency even when a cache server is removed from the cache server group. When a cache server fails or is removed, the positions of the other cache servers in the list do not change. Instead, the remaining cache servers are redistributed to the list entries freed by the failing cache server. Figure

14.17illustrates how persistency is maintained even though a cache server becomes non-operational.

Figure 14.17 MinMiss Hash Metric - Persistency Sustained

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When Cache Server 2 in Figure 14.17 is removed from the group, the list of available cache servers is not readjusted. Only the list entries that are now empty are replaced with other available cache servers. Therefore, persistency is sustained for all available cache servers. If Cache Server 2 becomes operational again, the list of available cache servers is recalculated so that the smallest number of cache servers is

Avaya P333R-LB User’s Guide

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Avaya P333R-LB manual Hash Metric Loss of Persistency

P333R-LB specifications

The Avaya P333R-LB is a robust and versatile switch that is part of Avaya's portfolio aimed at enterprise networking solutions. This switch is designed to enhance the performance and scalability of network infrastructure while ensuring high availability and reliability.

One of the main features of the P333R-LB is its Layer 3 switching capability, which allows for efficient routing within an organization's network. This capability is particularly beneficial for organizations with multiple VLANs, as it simplifies the routing process and ensures that data packets are transmitted in the most efficient manner possible.

The P333R-LB is equipped with advanced Quality of Service (QoS) features to prioritize traffic based on the type of application being used. This ensures that critical applications, such as VoIP and video conferencing, receive the necessary bandwidth and low latency required for optimal performance. Additionally, it supports both IPv4 and IPv6 protocols, making it adaptable to a variety of networking environments.

Another important feature of the Avaya P333R-LB is its stackable design. This allows multiple switches to be interconnected, creating a single logical unit. This stacking capability not only simplifies management but also increases overall network capacity and redundancy. In case of a hardware failure, the stack can continue operating without interruption, maintaining network integrity and service continuity.

The switch also integrates advanced security features, including support for MAC filtering, access control lists, and port security. These features help to safeguard network resources from unauthorized access and potential threats. Moreover, the P333R-LB supports 802.1X port-based authentication, which adds an additional layer of security during user access to the network.

The Avaya P333R-LB comes with multiple Gigabit Ethernet ports, allowing for high-speed connectivity to devices such as servers, workstations, and IP phones. This ensures that all devices on the network can communicate effectively, supporting the demands of modern enterprise environments.

For management and monitoring, the P333R-LB offers a user-friendly web interface along with SNMP support, enabling network administrators to easily configure settings and monitor network performance. This simplicity in management is crucial for IT teams that need to ensure optimal network performance while minimizing downtime.

In summary, the Avaya P333R-LB is a feature-rich, scalable, and reliable switch that meets the needs of demanding enterprise networks. With its advanced technologies, QoS support, stackable design, robust security features, and high-speed connectivity options, the P333R-LB is positioned to support a wide range of applications and enhance overall network performance.