Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

dlogsdonmd's avatar
dlogsdonmd
Icon for Nimbostratus rankNimbostratus
Feb 25, 2016

Default Pool and iRules

Hello, I have a default pool of servers assigned to a VS object and then also have an irule that specifies specific traffic (URIs) should be directed to different server pools. How does the LTM...
devops
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Feb 25, 2016

Hi Diane,

the behavior is a little bit weirdo...

When ever you start a TCP-Connection to the Virtual Server the 

default pool
is pre-selected but can be overwrtitten by using the 
[pool]
command.

For OneConnect-enabled HTTP Virtual Servers the last selected 

[pool]
would always stick to the TCP-connection.

For OneConnect-disabled HTTP Virtual Servers the 

default pool
would be automatically reselected on every subsequent HTTP request, but not for 11.5.3 HF2, 12.0.0 and 12.0.0 HF1 (its currently a bug^^).

For further information refer to...

https://support.f5.com/kb/en-us/solutions/public/9000/800/sol9800.html

https://devcentral.f5.com/questions/sol9800-dokumentation-bug

Cheers, Kai