Bug ID 950665: Pool and pool members created for dynamic ECMP routes are not freed

Last Modified: Apr 09, 2026

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

Known Affected Versions:
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, 17.1.2.2, 17.1.3, 17.1.3.1, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5, 21.0.0, 21.0.0.1

Opened: Oct 02, 2020

Severity: 3-Major

Symptoms

-- Dynamic ECMP routes. -- High usage of TMM memory may be reported. -- The ltm log may record the following errors: err merged[9436]: 011b0900:3: TMSTAT error tmstat_remerge: Cannot allocate memory.

Impact

- tmm memory leak - tmstat segments for tmm could grow very large.

Conditions

Dynamic routing is used and routes with more then one nexthop are repeatedly added and removed by the router(s)

Workaround

Use a default gateway pool instead of dynamic routing for routes with more then one nexthop - https://support.f5.com/csp/article/K15582

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips