BugZero | F5 BugID 1320589 - Fallback IP option not available for 'Load Balanci...

F5 - Defect ID: 1320589

Fallback IP option not available for 'Load Balancing Method' under 'Inbound Wide IPs'

F5 - Defect ID: 1320589

Fallback IP option not available for 'Load Balancing Method' under 'Inbound Wide IPs'

Last updated on March 16th, 2026

BugZero Risk Score
6.9 Medium

Overall: 6.9

Severity: 7.3

Community: 4.2

Lifecycle: 8.7

What is the BugZero Risk Score?

F5 Integration

Learn more about where this data comes from

F5 Integration

Learn more

Bug Scrub Advisor

Streamline upgrades with automated vendor bug scrubs

Bug Scrub Advisor

Learn more

BugZero Enterprise

Wish you caught this bug sooner? Get proactive today.

BugZero Enterprise

Learn more

Bug Details

Priority: 3-Major
Status: Resolved
Impact Category: Global Traffic Manager (DNS)

Description

Symptoms

Link Controller option to configure "Fallback" "fallback IP" for "Inbound Wide IPs" is missing.

Impact

Cannot configure "Fallback" where Fallback IP" is the desired option.

Conditions

Selecting 'fallback Ip' from fallback under load balancing method while creating new or updating existing Inbound Wide IPs.

Workaround

Use tmsh to add a fallback address tmsh modify gtm pool a xxx fallback-ip <ip>

Fix Information

None

Change history

2026-03-16 Added: 15.1.10.7, 15.1.10.8, 16.1.6.1, 17.1.3, 17.1.3.1

2025-12-31 Added: 15.1.10.7, 15.1.10.8, 16.1.6.1, 17.1.3

2025-11-15 Added: 15.1.10.7, 15.1.10.8, 16.1.6.1, 17.1.3

2025-10-19 Added: 15.1.10.7, 15.1.10.8, 16.1.6.1, 17.1.3

2025-10-15 Added: 17.1.3

2025-06-28 Added: 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 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, 16.1.6, 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

Relevant Products

Click on a version to see all relevant bugs

Affected versions:15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 15.1.10.7, 15.1.10.8, 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, 16.1.6, 16.1.6.1, 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

Fixed versions: No known fixed versions

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: No known fixed versions

Top F5 Defects

9.6Defect ID: 2141125
Multicast traffic is dropped with incorrect VLAN tagging
9.4Defect ID: 1407909
For E810 100G SR-IOV NICs, traffic disruption is seen with ICE driver v1.11.14 and NVM 4.20 combination.
9.4Defect ID: 970269
Install fails as lind keeps failing due to "Fatal error: block id new probe failed - device file:/dev/cdrom"
9.4Defect ID: 2261257
High Availability (HA) State Changes to Disconnected and Primary Unit Enters INOPERATIVE State
9.4Defect ID: 2262353
Pccd may crash when deleting a Zone with VLAN association

Ready to prevent the next vendor outage?

Get a demo

F5 - Defect ID: 1320589

Fallback IP option not available for 'Load Balancing Method' under 'Inbound Wide IPs'

F5 - Defect ID: 1320589

Fallback IP option not available for 'Load Balancing Method' under 'Inbound Wide IPs'

Last updated on March 16th, 2026

BugZero Risk Score6.9 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Top F5 Defects

Ready to prevent the next vendor outage?

Links

BugZero Risk Score
6.9 Medium