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z/VM TCP/IP VSWITCH Maintenance


Virtual Switch Controller Maintenance Levels

The z/VM TCP/IP stack plays an important role in the Virtual Switch. It initializes the OSA-Express device used by the VSWITCH, and continues to communicate with the OSA-Express as the status changes, such as when a new guest host couples to the virtual switch.

For this reason, maintenance of the TCP/IP stack is important to virtual switch operation.

If you are using virtual switches, you need to stay current with CP maintenance for the virtual switch.


How to determine your current Maintenance Level

  1. Use the QUERY VSWITCH command to identify the name of the virtual switch controller.

  2. Use the NETSTAT TCP controller LEVEL command to display information about the TCPIP MODULE. Controller is the name of the virtual switch controller from step 1.

  3. Use the TCPSLVL TCPIP MODULE fm command for the TCPIP MODULE in use by controller. In the display look for the latest APAR applied to TCTOOSD, which is of particular interest for virtual switch controllers.


z/VM 5.3.0 Maintenance Levels

RSU APAR PTF Brief Description
none n/a n/a Base

z/VM 5.2.0 Maintenance Levels

RSU APAR PTF Brief Description
0602RSU PK08444 UK13910 New function: QDIOETHERNET and VSWITCH controller GVRP support

Together with z/VM CP APAR VM63784 this provides support for GVRP (GARP VLAN Registration Protocol). GVRP is exclusive to OSA-Express hardware on D/T2094 (System z9 EC Server) and D/T2096 (System z9 BC Server).

0701RSU PK33023 UK19331 Periodically retry failing VSWITCH connection.
0701RSU PK21497 UK15039 Eliminate duplicate broadcast echo/responses for VSWITCH-connected systems.
0702RSU PK34867 UK25774 Support additional OSA-Express2 return codes.


z/VM 5.1.0 Maintenance Levels

RSU APAR PTF Brief Description
0401RSU PQ86659 UQ92099 No connectivity after VSWITCH recovery (Grat ARP untagged)
0501RSU PQ98202 UQ96195 VSWITCH Controller Enhancement - ETHERNET VSWITCH
0502RSU PQ98183 UK00363 DTCOSD101I OSA Device will not initialize (resetting event)
0501RSU PQ97436 UQ95672 Virtual Switch Controller Enhancements for Layer 2
0601RSU PK12005 UK08089 Virtual Switch status remains initialization in progress.
0701RSU PK08444 UK13911 New function: QDIOETHERNET and VSWITCH controller GVRP support

Together with z/VM CP APAR VM63784 this provides support for GVRP (GARP VLAN Registration Protocol). GVRP is exclusive to OSA-Express hardware on D/T2094 (System z9 EC Server) and D/T2096 (System z9 BC Server).

None PK21497 UK15038 Eliminate duplicate broadcast echo/responses for VSWITCH-connected systems.
None PK34867 UK25773 Support additional OSA-Express2 return codes.


z/VM 4.4.0 Maintenance Levels

RSU APAR PTF Brief Description
0402RSU PQ83743 UQ84451 MSDTCOSD204E Error 7D at TCP/IP Startup
0403RSU PQ83270 UQ85300 DTCOSD309W DTCOSD082E When VSWITCH rebooted no autorestart
0404RSU PQ85245 UQ91173 QDIO Device does not always autorestart
0404RSU PQ86659 UQ91943 No connectivity after VSWITCH recovery (Grat ARP untagged)
0501RSU PQ98183 UK00362 DTCOSD101I OSA Device will not initialize (resetting event)
0601RSU PK12005 UK08088 Virtual Switch status remains initialization in progress.


This document is maintained by:

Mary Ellen Carollo
z/VM Development
maryelln@us.ibm.com