What is the need of setting connection limit to pool members ?

chetan,

See the following solution for more help on this: Setting Connection Limit

"You can configure a virtual server, pool member, or node to prevent an excessive number of connection requests during events such as a Denial of Service (DoS) attack or a planned, high-demand traffic event. To ensure the availability of a virtual server, pool member, or node, you can use the BIG-IP® Local Traffic Manager™ to manage the total number of connections and the rate at which connections are made."

You can also use it for staged migrations to new pool members, or even if a pool member is struggling with resources and can only cope with fewer connections.

Hope this helps,

N