Bug ID 1922617: BGP Multipath selection might be unpredictable.

Last Modified: Apr 17, 2025

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

Known Affected Versions:
16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1

Opened: Apr 10, 2025

Severity: 3-Major

Symptoms

BGP Multipath selection might be unpredictable.

Impact

Route might not be considered candidate for multipath.

Conditions

Four EBGP neighbors in two different AS, each sending the same route (NRLI) towards BIG-IP. Route might sometimes not be considered candidate for multipath.

Workaround

Set 'bgp bestpath as-path multipath-relax' to install all available paths.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips