Thursday, 12 December 2013

Load Balancer ( F5- BIG IP and Cisco ACE)

 

Hi Guys, today i discuss about one of the hot topics of the Networking Field named as " Load Balancers"
There are numbers of vendors who are working on the Load Balancer's in which one of the big player is Cisco. They launched there Load Balancer with the name of ACE. Another vendor for the same is F5. They launched it as BIG IP Load Balancer.

Load balancing is a crucial element to any network that is required to maintain high availability while gracefully handling sudden spikes in traffic. In the event of a sudden increase in traffic, the load balancers prevent the web, application, and database servers from becoming overloaded by distributing the traffic evenly across servers. If a web server fails, the load balancers will divert any traffic away from that server, maintaining the availability of your website and applications.

Load Balancer Type

Round Robin

Round Robin load balancing takes all incoming connections and routes them one at a time, server by server in an equally distributed fashion with each server taking turns. If you have two servers, incoming connections will alternate between the two. If you have 4 servers, connections will be routed to server 1, server 2, server 3, and then server 4 before beginning the cycle again.

Least Connect

Least Connect load balancing will route incoming connections to the server with the lowest load on it. Connections are sent to each server depending on the total number of concurrent sessions on the servers. If you have two servers, the first with 24 sessions running and the second with 12 sessions running, then incoming connections will be routed to server 2 until the ratio of connections changes.

Load Balancer Persistence

None

None is the default, determining routing only according to Load Balancer Type.

SSL Sticky

SSL Sticky will route all traffic for an SSL session to the same destination after the initial connection establishes the session. Note that this persistence only works for SSL traffic and load balancing for other types of traffic will not work when this is set.

Source Address

Source Address persistence will cause all traffic from a given source address to be routed to the same destination host after the initial connection.

You can study further the F5 load Balancer named as " BIG IP" as follows:-
F5 Load Balancer PDF

Another Load Balancer of the Cisco Named as ACE is as follows:
Cisco ACE Load Balancer Guide PDF

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