EE Connection Network Reachability Awareness - UNRCHTIM VRN Selected

  IST1903I/IST2050I - PATH WILL NOT BE SELECTED FOR UNRCHTIM = xxxxx SECONDS

Cause

When an Enterprise Extender virtual node (VRN) is selected by VTAM Topology and Routing Services (TRS), a DIAL is done using the dynamic PU. The session will stay in ADIALIP status until the DIAL completes or until there is a time-out on the connection.

If there is a problem with the physical connection underlying the path through the VRN, the dynamic PU will eventually INOP due to the time-out. The following messages are received:

Next, the session fails with sense 08010000. This is normal processing.

When a DISPLAY NET,TOPO,LIST=UNRCHTIM command is entered, the path is now unreachable:



However, it appears that TRS is still selecting the unreachable path through the Enterprise Extender VRN because sessions continue to fail with sense 08010000 following the messages noted above for additional dynamic PUs (for example, if the first INOP is for CNV00074, there can be additional INOPs for CNV00075, CNV00076, and so on.).

The reason this is occurring is that these sessions were requested, and TRS selected the route through the EE VRN, prior to the first PU INOP and the detection of the unreachable partner. It can take a significant amount of time from the DIAL request until the time-out occurs. During this time a number of sessions can be requested. A DISPLAY SESSIONS,LIST=ALL command will show the session status of the session for which a DIAL request is pending as ADIALIP. The session status of the other sessions waiting for this same path will show as PRAV3. Each of these pending sessions will fail. Further displays of the unreachable partner information will show that the EXPIRES time changes each time an INOP occurs.