IBM SC30-3681-08 Using ELS, Groups, ELS displays network information as follows, Code Meaning

Using ELS

Table 18. Packet Completion Codes (Error Codes) (continued)

Code	Meaning
1	Random, unidenti®ed error
2	Packet not queued for output due to ¯ow control reasons
3	Packet not queued because network is down
4	Packet not queued to avoid looping or bad broadcast
5	Packet not queued because destination host is down (only on networks
	where this can be detected)

ELS displays network information as follows:

nt 1 int Eth/0 (or ) network 1, interface Eth/0,

where:

v1 is the network number (each network on the router is numbered sequentially from zero).

v0 is the unit number (the interfaces of each hardware type are numbered sequentially from zero).

Ethernet and 802.5 hardware addresses appear as a long hexadecimal number.

IP (Internet Protocol) addresses are printed as 4 decimal bytes separated by periods, such as 18.123.0.16.

Groups

Groups are user-de®ned collections of events that are given a name, the group name. Like the subsystem, subsystem and event number, and logging level, use the group name as a parameter to ELS commands. However, there are no prede®ned group names. You must create a group before you can specify its name on the command line.

To create a group, use the add con®guration command, specify the name you want to call the group, and then specify the events you want to be part of the group. The events you add to the group can be from different subsystems and have different logging levels.

After creating a group, use the group name to manipulate the events in the group as a whole. For example, to turn off display of all messages from events that have been added to a group named grouptwo, include the group name on the command line, as follows:

nodisplay group grouptwo

To delete a group, use the delete command.

Using ELS

To use ELS effectively, do the following:

vKnow what you want before using the ELS system. Clearly de®ne the problem or events that you want to see before using the MONITR process.

vExecute the command nodisplay subsystem all all to turn off all ELS messages.

vTurn on only those messages that relate to the problem you are experiencing.

Chapter 12. Using the Event Logging System (ELS) 151