A fix is available
APAR status
Closed as program error.
Error 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.
Local fix
restart the link
Problem summary
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.
Problem conclusion
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.
Temporary fix
Comments
APAR Information
APAR number
LI77309
Reported component name
CS LINUX ON ZSE
Reported component ID
5724I3400
Reported release
623
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2013-04-26
Closed date
2013-04-26
Last modified date
2013-04-26
APAR is sysrouted FROM one or more of the following:
LI76847
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
CS LINUX ON ZSE
Fixed component ID
5724I3400
Applicable component levels
R623 PSY
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSDMF3","label":"Communications Server for Linux on zSeries"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"623","Line of Business":{"code":"LOB35","label":"Mainframe SW"}}]
Document Information
Modified date:
14 October 2021