LI76847: LLC LINK FAILS DURING BONDED ETHERNET FAILOVER
A fix is available
Closed as program error.
When using LLC protocol with a bonded ethernet adapter and the underlying primary adapter fails so the backup adapter takes over, a link station using this adapter will fail.
restart the link
USERS AFFECTED: All users of LLC on s390x systems. PROBLEM DESCRIPTION: When using LLC protocol with a bonded ethernet adapter and the underlying primary adapter fails so the backup adapter takes over, a link station using this adapter will fail. PROBLEM SUMMARY: A previous fix, LI75483, dealt with a problem with re-ordering frames before processing by the LLC driver. This re-ordering is done by using an internal sequence numbering method implemented by zOS on the ethernet frames. This will not be visible on a packet trace. When the bonded ethernet failover occurs, the sequence numbering changes. This causes Communications Server to ignore any frames that would appear to be out of sequence, until the next expected sequence number frame is received.
Code has been modified so that when a bonding failover occurs, the next sequence number received will be accepted as the new starting point. Also, the following message will be logged in /var/log/messages: SNA LLC2 Ethernet bonded port #xx failover.
Reported component name
CS LINUX ON ZSE
Reported component ID
NoSpecatt / Xsystem
Last modified date
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fixed component name
CS LINUX ON ZSE
Fixed component ID
Applicable component levels