BugZero | F5 BugID 611487 - vCMP: VLAN failsafe does not trigger on guest

F5 - Defect ID: 611487

vCMP: VLAN failsafe does not trigger on guest

F5 - Defect ID: 611487

vCMP: VLAN failsafe does not trigger on guest

Last updated on July 18th, 2026

BugZero Risk Score
6.7 Medium

Overall: 6.7

Severity: 7.3

Community: 4.2

Lifecycle: 7.0

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Bug Details

Priority: 3-Major
Status: Verified
Impact Category: TMOS

Description

Symptoms

vCMP: VLAN failsafe does not trigger on guest due to IPv6 link-local neighbor discovery traffic from host.

Impact

Since the heartbeat messages going over IPv6 link-local addresses continue to be successfully passed from host to guest, VLAN failsafe does not trigger if a downstream router or switch goes down that's connected to the VLAN.

Conditions

vCMP host configured, VLAN failsafe enabled on a VLAN, one or more VCMP guests enabled that use that VLAN

Workaround

If you are able to, disabling IPv6 on the host will allow VLAN failsafe to work as expected.

Fix Information

None

Change history

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.0.0, 12.0.0 hf1, 12.0.0 hf2, 12.0.0 hf3, 12.0.0 hf4, 12.1.0, 12.1.0 hf1, 12.1.0 hf2, 12.1.1, 12.1.1 hf1, 12.1.1 hf2, 12.1.2, 12.1.2 hf1, 12.1.2 hf2, 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

Fixed versions: 13.0.0

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 13.0.0

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F5 - Defect ID: 611487

vCMP: VLAN failsafe does not trigger on guest

F5 - Defect ID: 611487

vCMP: VLAN failsafe does not trigger on guest

Last updated on July 18th, 2026

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 611487

vCMP: VLAN failsafe does not trigger on guest

F5 - Defect ID: 611487

vCMP: VLAN failsafe does not trigger on guest

Last updated on July 18th, 2026

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.7 Medium

BugZero Risk Score
6.7 Medium