--> Priority Group Activation in F5 allows configuring the standby servers for the active servers in the pool.
--> Standby Servers won't receive the traffic from F5 until primary servers are running.
--> Standby Servers are automatically activated once the defined number of primary servers goes down.
--> Priority Group Activation feature mainly used to provide a web page with maintenance to the clients when the number of primary servers was unavailable due to load.
--> Priority Group Activation allows you to configure multiple priority pool groups within the pool
--> if priority group activation is set then F5 LTM will use available members with the highest priority number first.
--> In this case, we configured three servers with a priority value of 10 and configured the other servers with a priority value of 5.
--> Standby or Backup Servers( Priority 5) won't receive the traffic from F5 LTM until two of the primary servers ( Priority 10) goes down.
--> If all the members in the pool are unavailable then F5 LTM can use Fall back Host feature which redirects user traffic.
--> We need to configure following parameters for Priority Activation Group:
1) Minimum Number of Active Pool Members in the Priority Group
2) Priority Group configured for the pool member within the Pool.
--> The default Priority of Pool members is assigned with 0 value.
--> The Pool member group which has the highest priority called as a primary priority group and other pool member group is called as a secondary priority group.
--> By default, The pool member group with the highest priority will receive traffic and if the minimum number of pool members are not active in the highest priority group then secondary priority group will be activated.
--> Existing Connections from Higher Priority group will not be moved to Secondary Priority group when secondary priority group is activated.
--> Only New connections are sent to Secondary Priority Group until the Minimum number of Pool Members become active in the primary priority group.
--> Once Minimum number of pool members become active in the primary priority group then all the new connections will be sent to Primary Priority Group.
--> Priority Group Method is disabled by default. Connections are load-balanced based upon the load balancing algorithm configured in the pool.
MD.Kareemoddin ( CCIE # 54759)
--> Standby Servers won't receive the traffic from F5 until primary servers are running.
--> Standby Servers are automatically activated once the defined number of primary servers goes down.
--> Priority Group Activation feature mainly used to provide a web page with maintenance to the clients when the number of primary servers was unavailable due to load.
--> Priority Group Activation allows you to configure multiple priority pool groups within the pool
--> if priority group activation is set then F5 LTM will use available members with the highest priority number first.
--> In this case, we configured three servers with a priority value of 10 and configured the other servers with a priority value of 5.
--> Standby or Backup Servers( Priority 5) won't receive the traffic from F5 LTM until two of the primary servers ( Priority 10) goes down.
--> If all the members in the pool are unavailable then F5 LTM can use Fall back Host feature which redirects user traffic.
--> We need to configure following parameters for Priority Activation Group:
1) Minimum Number of Active Pool Members in the Priority Group
2) Priority Group configured for the pool member within the Pool.
--> The default Priority of Pool members is assigned with 0 value.
--> The Pool member group which has the highest priority called as a primary priority group and other pool member group is called as a secondary priority group.
--> By default, The pool member group with the highest priority will receive traffic and if the minimum number of pool members are not active in the highest priority group then secondary priority group will be activated.
--> Existing Connections from Higher Priority group will not be moved to Secondary Priority group when secondary priority group is activated.
--> Only New connections are sent to Secondary Priority Group until the Minimum number of Pool Members become active in the primary priority group.
--> Once Minimum number of pool members become active in the primary priority group then all the new connections will be sent to Primary Priority Group.
--> Priority Group Method is disabled by default. Connections are load-balanced based upon the load balancing algorithm configured in the pool.
MD.Kareemoddin ( CCIE # 54759)
Nice explanation.
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