IBM SC30-3681-08 manual Interpreting a Message, Subsystem, Event Number, Logging Level

Using ELS

Interpreting a Message

This section describes how to interpret a message generated by ELS. Figure 4 shows the message contents.

Figure 4. Message Generated by an Event

The information illustrated in Figure 4 as well as the ELS logging level information displayed with the list subsystem command is as follows:

Subsystem

Subsystem is a prede®ned short name for a router component, such as a protocol or interface. In Figure 4, GW identi®es the subsystem through which this event occurred.

Other examples of subsystems include IP, TKR, and X25. On a particular router, the actual subsystems present depend on the hardware and software con®gured for that router. You can use the list subsystem command described in this chapter to see a list of the subsystems on your router.

Enter the subsystem as a parameter to an ELS command when you want the command to affect the entire subsystem. For example, the ELS command display subsystem GW causes all events (except the events with 'debug' logging level) that occur through the GW subsystem to be displayed.

Event Number

Event Number is a prede®ned, unique, arbitrary number assigned to each message within a subsystem. In Figure 4, 019 is the event number within the GW subsystem. You can see a list of all the events within a subsystem by using the list subsystem command, where subsystem is the short name for the subsystem.

The event number always appears with a subsystem identi®er, separated by a period. For example: GW.019. The subsystem and event number together identify an individual event. They are entered as a parameter to certain ELS commands. When you want a command to affect only the speci®ed event, enter the subsystem and event number as a parameter for the ELS command.

Logging Level

Logging level is a prede®ned setting that classi®es each message by the type of event that generated it. Use the list subsystem ELS console command to display the setting of the logging level. Table 17 on page 150 lists the logging levels and types. ERROR, INFO, TRACE, STANDARD, and ALL are aggregates of other logging level types. STANDARD is the recommended default.

Chapter 12. Using the Event Logging System (ELS) 149