SDLC Alert Local Logging

Before SNA Server attempts to build and send an SDLC Link Alert, information about the outage that caused the alert is logged in a log file that can be viewed using the Windows NT Event Viewer. Message 182 will always be logged, as follows:

182I:  Connection failure, code = (outagecode)
Cause Data                          = hh...hh
Link Role                           = hh
Remote Node Type                    = hh

The Outage Code (outagecode) is also reported on a 23 message. For a complete list of these codes, the conditions they represent, and the specific Link Alerts on which they are used, see the next section.

Cause Data is a list of the failure causes from the Failure causes subvector in the alert. Link Role and Remote Node type are as described in the Link Connection Subsystem Configuration Data subvector in the alert.

A connection failure can be due to a station outage, rather than a link outage. If it is due to a station outage — which can be recognized by outage code values of X'80' or higher — then message 183, formatted as follows, will also be logged:

183I:
Detailed diagnostic data for station (stationaddress):
SBSY   CFTX   CFRX   V(S)   V(R)   N(R)   OSFC   T1CT
hh     hhhh   hhhh   hh     hh     hh     hh     hhhh

The value (stationaddress) is the station address as given in the Detail qualifier subvector in the alert.

The other fields are all data from the Link Station Data subvector, as follows:

Identifying Alerts from Local Logs Only

When only the local log of an alert is available, you can still obtain the information that would have been supplied on the alert. To do this, check the outage code given on the 182 message against the following list to find the alert that uses this outage code, and then check the alert data in "SDLC Failure Alerts" earlier in this chapter. Some Outage Codes are used for more than one alert; in these cases, you can find the appropriate alert by comparing the failure causes codes given on the 182 message with those given in the alert data.

SDLC Outage Codes