Chapter 14 Load Balancing in the P333R-LB

Web server.

3The cache checks if it has the requested information. If it does, it replies to the client. If the cache does not have the information, it retrieves the information from the real Web server, and then replies to the client.

P333R-LB supports transparent caches. A transparent cache is capable of accepting packets not destined to its IP. The cache usually uses NAT in its IP stack, so the higher layers can process packets not destined to the cache IP.

The following steps illustrate an AR process:

1The user issues an HTTP request with its IP address as the source address and the Web server's IP address as the destination address.

2P333R-LB routes the packet to the Web cache(s) (load balancing if needed), but the packet still has the Web server's IP address as the destination IP address.

3If the cache has the required page, the cache returns the page to the client with the destination IP address of the client and the source IP address of the Web server. If the cache does not have the required page, the cache returns the packet to P333R-LB, and it is routed to the Web server.

4On returning from the Web server, P333R-LB routes the packet to the cache. The cache updates itself with the new page, and returns the packet to the client.

In the Cache Redirection packet flow, the following events need to be indistinguishable on the IP level:

Redirection of packets from the client to the cache.

Routing of packets from the cache to the WAN.

To address this issue, P333R-LB uses different VLAN areas for the clients and the cache. If a packet arrives to P333R-LB from the client's VLAN, it is redirected to the cache, and if it arrives from the server’s VLAN, it is routed to the WAN.

Avaya P333R-LB User’s Guide

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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.