The Cisco IOS Software Network Address Translation (NAT) can distribute subsequent TCP connections and UDP sessions over multiple network connections if equal-cost routes to a given destination are available. In the event that one of the connections becomes unusable, object-tracking, a component of Optimized Edge Routing (OER), can be used to deactivate the route until the connection becomes available again, which assures network availability in spite of instability or unreliability of an Internet connection.

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In well designed networks, you can achieve a surprising amount of load balancing even when you use BGP as one of your core routing protocols.

It’s always possible to load-balance between a pair of edge routers; if you don’t have two equal-cost paths between them across your network, you can engineer them with MPLS Traffic Engineering. Similarly, you can always load-balance traffic across parallel links between two edge routers in adjacent autonomous systems.

Furthermore, you can configure EBGP load balancing on edge routers that have multiple links connected to neighbors in the same adjacent autonomous system, as long as routes received from all neighbors have the same AS path and MED (and they have the same local preference and weight if you’ve set these attributes with an inbound route-map). Load balancing between EBGP and IBGP routes is not possible, as it might lead to forwarding loops.

You can also configure IBGP load-balancing, allowing you to split traffic between a number of edge routers (up to 16 with IOS release 12.3T or 12.4); as long as all the BGP paths received from them have identical path-selection attributes and the IGP cost to the BGP next-hop is the same. With the support of link bandwidth extended community introduced in IOS release 12.3, you can split the traffic proportionally to the interface bandwidth of the inter-AS links.

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In many location, including but definitely not limited to India, single ADSL / Cable connections can be unreliable and also may not provide sufficient bandwidth for your purposes. One way to increase reliability and bandwidth of your internet connection is to distribute the load (load balancing) using multiple connections.

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The industry recognizes that hardware-based load balancing is an enterprise solution best suited to larger sites with heavy traffic. Software-based load-balancing solutions are suitable for smaller sites or when you use them as an interim solution in a growing site

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A web server handles HTTP (Hypertext Transfer Protocol) requests sent to it by web browsers. When you type in a URL —http://www.digital-web.com, for example—your computer sends out a request to look up the servers needed to handle requests and send responses back quickly. The technique for determining how to route requests to the cluster of web servers efficiently is called load balancing.

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This article offers an overview of several approaches to load balancing on Web application server clusters. A cluster is a group of servers running a Web application simultaneously, appearing to the world as if it were a single server. To balance server load, the system distributes requests to different nodes within the server cluster, with the goal of optimizing system performance. This results in higher availability and scalability — necessities in an enterprise, Web-based application.

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This step-by-step guide provides instructions for configuring Network Load Balancing (NLB) with Terminal Services.
Using NLB with Terminal Services offers the benefits of increased availability, scalability, and load-balancing performance, as well as the ability to distribute a large number of Terminal Services clients over a group of terminal servers.
NLB with Terminal Services overview
NLB distributes traffic across […]

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