Nimbostratusnot able to understand how persistence actually helps? how do we come to know which type of persistence to use in which scenario.
Hmm little broad information. In short - persistence allows to forward the requests from the same client to the same pool member.
Let say your session requires authentication. You entered your username and pass. The current webe server holds this information. if your 2d request load balanced to the 2d pool member which has no login details you entered in the 1st pool member, you have to enter credentials again.
Persistence allows you to send the 2d request to the pool member which stores login data.
Every type of persistence depend on what you want to achieve and which options you have. E.g. you will not be able to use Cookie persistence for non-http traffic. In that case you will chose another e.g src ip based
You can read basics here. https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-profiles-reference-12-1-0/4.html
If you have any questions, feel free to ask
CumulonimbusHi,
Basicly, persistence is when we use an information from a layer below the application layer or use Application layer information to maintain a client request to a single server.
Suppose you load balance several servers, the user requestion is FW to a single server because he is authenticated and working on this server. but if there is no persistence these requests would probably be spread on all the servers and he would possibly lose the work he has done on the previous server and he should potentially authenticate on each new server ...
on what should we base ourselves to define a persistence:
Read this article it will help you:
F5 article:
regards
