CLI Reference Guide

Chapter 5 | SNMP Commands
Notification Log Commands
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Default Setting
None
Command Mode
Global Configuration
Command Usage
◆ Systems that support SNMP often need a mechanism for recording Notification
information as a hedge against lost notifications, whether there are Traps or
Informs that may be exceeding retransmission limits. The Notification Log MIB
(NLM, RFC 3014) provides an infrastructure in which information from other
MIBs may be logged.
◆ Given the service provided by the NLM, individual MIBs can now bear less
responsibility to record transient information associated with an event against
the possibility that the Notification message is lost, and applications can poll
the log to verify that they have not missed any important Notifications.
◆ If notification logging is not configured and enabled, when the switch reboots,
some SNMP traps (such as warm start) cannot be logged.
◆ To avoid this problem, notification logging should be configured and enabled
using the snmp-server notify-filter command and nlm command, and these
commands stored in the startup configuration file. Then when the switch
reboots, SNMP traps (such as warm start) can now be logged.
◆ When this command is executed, a notification log is created (with the default
parameters defined in RFC 3014). Notification logging is enabled by default
(see the nlm command), but will not start recording information until a logging
profile specified with this command is enabled with the nlm command.
◆ Based on the default settings used in RFC 3014, a notification log can contain
up to 256 entries, and the entry aging time is 1440 minutes. Information
recorded in a notification log, and the entry aging time can only be configured
using SNMP from a network management station.
◆ When a trap host is created with the snmp-server host command, a default
notify filter will be created as shown in the example under the show snmp
notify-filter command.
Example
This example first creates an entry for a remote host, and then instructs the switch
to record this device as the remote host for the specified notification log.
Console(config)#snmp-server host 10.1.19.23 batman
Console(config)#snmp-server notify-filter A1 remote 10.1.19.23
Console#