Cannot distribute traffics evenly by using round robin

Product Discussions ADC - Application Delivery
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1

Hello All,

Customer use the round-robin method without any persist template.
Total sessions are not load balancing evenly below;
Surely I checked again after clearing sessions. And the monitor of real servers was normal.
But sessions still distributed evenly.
I think this issue is limited to my customer…:slight_smile:
However…I wonder if anyone have this experience.

*v112_158_gr_80 State: All Up
r112_143:14080 20 5947332 52365756 51882310 892
r112_144:14080 21 5948479 52238493 51658280 906
r112_145:14080 21 5948154 52180299 51569971 946
r112_146:14080 23 5948650 52240530 49853274 1194

FrontB-L4-1-Active#sh slb server | be r112_14
r112_143:14080/tcp 22 136903414 936764409 1203320848 1148 Up
r112_143: Total 22 136903414 936764409 1203320848 1148 Up
r112_144:14080/tcp 17 136903086 933975503 1193917435 1167 Up
r112_144: Total 17 136903086 933975503 1193917435 1167 Up
r112_145:14080/tcp 21 137015956 934610406 1194983543 948 Up
r112_145: Total 21 137015956 934610406 1194983543 948 Up
r112_146:14080/tcp 24 137013613 934139889 1184469441 1207 Up
r112_146: Total 24 137013613 934139889 1184469441 1207 Up

Thanks,
CB.

2

What ACOS build have you installed? I would like to replicate on our lab? Also what application? Microsoft, standard IIS…please provide details.

Genard

3

Genard,
Thank you for replying.

First, I think I need testing with some verions and IIS web severs.
I will update the results.

Thanks,
CB

4

So for round robin algorithm the CPU is monitored during server selection. If a request landed on a CPU that has a heavy load, the request may have to be redirected to another CPU causing the round robin algorithm to not distribute evenly. The A10 round robin has a proprietary selection algorithm based on CPU load. If you want an evenly distributed selection across servers, I would suggest that you try the “round robin strict”. The “round robin strict” will offer an equal distribution of request across servers with no consideration of CPU threshold.