Forum Discussion
Bjoern_111017
Nimbostratus
NimbostratusRule to select second node when 1st node timeout
We have a virtual server configuration with a corresponding pool consisting of two members.
This pool has priority group activation activated so that connections are directed to pool member 1, if that pool member is available. Otherwise the connections are directed to pool member 2.
Is it possible to create an rule which additionally redirects a connection to pool member 2 when member 1 doesn't answer within i.e. 5 seconds?
hoolioCirrostratus
Which LTM version are you running?
You could do this with a monitor. Set the monitor timeout to the longest time you want to give the higher priority pool member to answer. Set the interval to (timeout -1 second) / 3. Generally, the default of 5 second interval and 16 second timeout is a good balance between checking the pool members often enough to prevent a long failure period and not overwhelming them with too much traffic. You can also set the pool property for action on service down to reselect to achieve something similar on a single request basis.
In 10.x you have the option for inband monitors. Or if you wanted to get fancy, you could use the after (Click here) command to reselect a new pool member.
Aaron
Aaron