Last Modified: Feb 03, 2026
Affected Product(s):
BIG-IP PEM
Known Affected Versions:
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
Opened: Jan 29, 2026 Severity: 2-Critical
- After HA failover, BWC throughput drops significantly below the configured limit. - BWC drop counters stop incrementing post-failover. - Issue reproducible only with UDP traffic; TCP traffic unaffected.
- UDP egress traffic is throttled below configured limit after failover. - BWC drop counters stop updating, causing inconsistent enforcement.
- BIG-IP PEM VE (v17.1.1 / v17.1.3) in KVM/RHOSP HA pair. - Failover occurs; connection mirroring disabled. - Server-to-client UDP traffic; BWC = 1.5 Gbps.
- Reduce BWC bandwidth to 1 Gbps, which restores expected UDP throughput. - Remove BWC-related configuration, restoring normal behavior. - Adjust RatePerUser (e.g., from 1 Gbps to 1.5 Gbps) while keeping BWC at 1.5 Gbps, which also restores expected enforcement.
None