Bug ID 478924: LTM Policy supports fallback pool

Last Modified: Sep 14, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6

Fixed In:
15.0.0

Opened: Sep 11, 2014

Severity: 4-Minor

Symptoms

The new 'fallback-pool' is an extension to the 'pool' forwarding action. If for some reason the primary pool within that action is not available, traffic will be forwarded to the fallback pool. Previously if the pool was not available, the connection would get reset. This new parameter makes LTM Policy forwarding to a pool more resilient to failures of the primary pool.

Impact

This is new functionality.

Conditions

-- Selects a forwarding action of 'pool', specifying pool name. -- For that forward-to-pool action, specify a fallback pool. Note: The fallback pool must be different from the primary pool name.

Workaround

N/A

Fix Information

LTM Policy now supports fallback pool.

Behavior Change

- With this change, you can select 'fallback-pool' along with primary 'pool' using LTM policy. - If the primary pool present in the forward action is unavailable, the LTM policy will forward traffic to the fallback pool. - Sample Usage ltm policy Drafts/mypolicy { controls { forwarding } last-modified 2018-05-21:11:31:27 requires { http } rules { 1 { actions { 1 { forward select fallback-pool fallback_pool pool http_pool } } } } status draft } - 'fallback-pool' is an extension of the 'pool' param present in the same action, and LTM policy will forward traffic only if primary 'pool' within that action is not available. - Also, you must specify 'pool' along with 'fallback-pool', and both cannot have same pool name.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips