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Cisco Catalyst Blade Switch 3030 Command Reference
78-17262-01
Chapter 2 Cisco
Catalyst
Blade Switch 3030 Cisco IOS Commands
snmp-server host
Defaults
This command is disabled by default. No notifications are sent.
If you enter this command with no keywords, the default is to send all trap types to the host. No informs
are sent to this host.
If no
version
keyword is present, the default is Version 1.
If Version 3 is selected and no authentication keyword is entered, the default is the
noauth
(noAuthNoPriv) security level.
Command Modes
Global configuration
Command History
Usage Guidelines
SNMP notifications can be sent as traps or inform requests. Traps are unreliable because the receiver
does not send acknowledgments when it receives traps. The sender cannot determine if the traps were
received. However, an SNMP entity that receives an inform request acknowledges the message with an
SNMP response PDU. If the sender never receives the response, the inform request can be sent again.
Thus, informs are more likely to reach their intended destinations.
However, informs consume more resources in the agent and in the network. Unlike a trap, which is
discarded as soon as it is sent, an inform request must be held in memory until a response is received or
the request times out. Traps are also sent only once, but an inform might be retried several times. The
retries increase traffic and contribute to a higher overhead on the network.
If you do not enter an
snmp-server host
command, no notifications are sent. To configure the switch to
send SNMP notifications, you must enter at least one
snmp-server host
command. If you enter the
command with no keywords, all trap types are enabled for the host. To enable multiple hosts, you must
enter a separate
snmp-server host
command for each host. You can specify multiple notification types
in the command for each host.
If a local user is not associated with a remote host, the switch does not send informs for the
auth
(authNoPriv) and the
priv
(authPriv) authentication levels.
When multiple
snmp-server host
commands are given for the same host and kind of notification (trap
or inform), each succeeding command overwrites the previous command. Only the last
snmp-server
host
command is in effect. For example, if you enter an
snmp-server host inform
command for a host
and then enter another
snmp-server host inform
command for the same host, the second command
replaces the first.
The
snmp-server host
command is used with the
snmp-server enable
traps
global configuration
command. Use the
snmp-server enable
traps
command to specify which SNMP notifications are sent
globally. For a host to receive most notifications, at least one
snmp-server enable
traps
command and
the
snmp-server host
command for that host must be enabled. Some notification types cannot be
controlled with the
snmp-server enable
traps
command. For example, some notification types are
always enabled. Other notification types are enabled by a different command.
The
no snmp-server host
command with no keywords disables traps, but not informs, to the host. To
disable informs, use the
no snmp-server host informs
command.
Release
Modification
12.2(25)SEE
This command was introduced.