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Table 18. Packet Completion Codes (Error Codes) (continued)
Code Meaning
1 Random, unidentified error
2 Packet not queued for output due to flow 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:
v 1 is the network number (each network on the router is numbered sequentially
from zero).
v 0 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-defined 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 predefined
group names. You must create a group before you can specify its name on the
command line.
To create a group, use the add configuration 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:
v Know what you want before using the ELS system. Clearly define the problem or
events that you want to see before using the MONITR process.
v Execute the command nodisplay subsystem all all to turn off all ELS
messages.
v Turn on only those messages that relate to the problem you are experiencing.
Using ELS
Chapter 12. Using the Event Logging System (ELS) 151