Chapter 14 Load Balancing in the P333R-LB

In Figure 14.15, the same two Cache Servers are configured as Real Servers for Server Load Balancing and for Application Redirection. Also, two Virtual Services are configured: one is a SLB service for the non-transparent proxy cache implementation, and the second is an AR service for the transparent cache implementation.

Traffic destined to the proxy cache, is sent by the client to the VIP as the Destination IP address, and dealt by the SLB Virtual Service (i.e., P333R-LB performs NAT on the packets and sends them to the Real Server based on the configured metrics). If the packets are to be forwarded to the Internet, P333R-LB receives the packets with the Source IP address of the cache (since it is a non-spoofing cache) and routes them to the Edge Router. On return, the packet is routed to the Real Server (since its IP address is now the Destination IP address) and the cache sends the packet back to the client.

Traffic not destined to the proxy cache, is sent with the Web Server’s IP address (193.170.2.3) as the Destination IP address, and is processed by the AR Virtual Service as usual, based on the second rule of the "ar-filter" statement.

The reason for the first "ar-filter" statement in the above configuration (ar-filter

10any 10.1.1.0 0.0.0.255 no-ar) is as follows: both in the SLB and in the AR cases it is possible that the packet is to be forwarded to the Web Server, if the required data is not in the cache. Upon returning, usually packets from the Web- server to the cache (in response to the non-transparent proxy cache SLB function) would be load-balanced according to the AR service metric. To prevent this from happening, the first "ar-filter" statement ensures that any packets destined to any of the Real Servers (caches) are not subjected to Application Redirection but rather are routed to the correct Real Server.

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Avaya manual Load Balancing in the P333R-LB

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.