Diagnosing routing problems by using the DC LINE/NODE/LINK TRACE

The DC trace traces line, node, and MSC link activity. It can be used in conjunction with the DFSMSCE0 exit trace to diagnose message routing problems in the terminal routing, input message routing, and link receive exits.

These traces log 6701 log records with a variety of trace IDs (such as: 6701-A01). If any of these traces is active, IMS logs a 6701-MSEA record when the message routing exit is called and a 6701-MSEB log record when the exit returns. For example, if the node trace is active, the following trace records are logged:

   6701-A01  - DC analyzer (DFSICIO0) is called to process the message
               LINK the DFSMSCE0 trace will log X'6701' records with a
               trace ID of MSEA (entry) or MSEB (exit) for terminal
               routing or link receive.  Refer to DFSMSCEB macro for
               the contents of the MSCEB block.

   6701-MSEA - DFSMSCE0 called to process the message

   6701-MSEB - DFSMSCE0 returns

   6701-MSCE - Logged if routing error detected, even if the line, node,
               or link trace is not active

   6701-A03  - DC Analyzer determines what to do next