F5 Load Balancer VIP pointing to 2 groups of SMTP servers

Hi Larry,

 

 

To answer your question, the F5 can do this.

 

 

In order to have this work the way you want it to, you'll want to monitor both groups, or pools in F5 lingo. Then you'd need an iRule that sends all traffic to the servers in group A, until all 4 are marked down, then send traffic to group B. The forums for iRules can be found here: http://devcentral.f5.com/Forums/tabid/1082223/asg/50/showtab/groupforums/aff/5/Default.aspx

 

 

By default, the BIG-IP will continue to monitor all pool members and report when they're back up and ready to accept traffic. As a result, the VIP will send traffic to the servers in group A once it sees them as back online.

 

 

Please let us know if you have further questions.

 

 

Cheers,

 

Helen

Hi Larry,

 

 

I thought of something else after I hit submit...

 

 

Instead of using iRules, another way to accomplish your goal would be to do priority group activation. Put the members of both groups A and B into a pool, and assign the members that are in group A a higher priority group than those in group B. For more information, go to chapter 4 of the LTM manual: https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/LTM_config_guide_943/ltm_pools.html?sr=18269610

 

 

I hope this is a more elegant solution for you.

 

 

Cheers,

 

Helen