IBM Support

Taking down the bonded vNIC interface might cause the backup device to fail

Flashes (Alerts)


Abstract

A bonded interface, in active-backup mode, can experience failure when the primary subordinate interface is down and then brought back up. It is observed that if the backing device is in invalid state, the backing device cannot process the login request of the virtual network interface Card (vNIC) device. The login process can fail when the primary subordinate vNIC interface comes up again.
Similarly, a bonded interface in a Link Aggregation Control Protocol (LACP) mode, can experience the same failure when the subordinate interfaces are taken down and up.

Content

Linux Releases Affected
SUSE Linux® Enterprise Server 12, Service Pack 3
SUSE Linux Enterprise Server 12, Service Pack 4
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server 15, Service Pack 1
SUSE Linux Enterprise Server 15, Service Pack 2
Red Hat® Enterprise Linux Server 8.1
Red Hat enterprise Linux Server 8.2

IBM Systems Affected
All IBM POWER9™ systems.

Symptoms
A bonded interface in Mode 1 Active-Backup can fail when the primary subordinate interface is down and then brought back up. A bonded interface in Mode 4 LACP can fail when the subordinate interfaces are taken down and brought up again.

Workaround
No workaround exists for this issue.

Fix Outlook

IBM is working with Red Hat and SUSE to release a fix for this issue. The issue is being investigated. The fix would come as part of a future SLES and RHEL maintenance release. Open a support ticket with Red Hat or SUSE if a test fix is needed before the next Red Hat or SUSE maintenance release.

See Red Hat Bug: 1825776
See SUSE Bug: 1170011

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Document Information

Modified date:
01 June 2020

UID

ibm16208621

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