C
HAPTER
23
| SNMP Commands
SNMP Target Host Commands
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you must enter at least one snmp-server host command. In order to
enable multiple hosts, you must issue a separate snmp-server host
command for each host.
u The snmp-server host command is used in conjunction with the
snmp-server enable traps command. Use the snmp-server enable traps
command to enable the sending of traps or informs and to specify
which SNMP notifications are sent globally. For a host to receive
notifications, at least one snmp-server enable traps command and the
snmp-server host command for that host must be enabled.
u Some notification types cannot be controlled with the snmp-server
enable traps command. For example, some notification types are
always enabled.
u Notifications are issued by the switch as trap messages by default. The
recipient of a trap message does not send a response to the switch.
Traps are therefore not as reliable as inform messages, which include a
request for acknowledgement of receipt. Informs can be used to ensure
that critical information is received by the host. However, note that
informs consume more system resources because they must be kept in
memory until a response is received. Informs also add to network
traffic. You should consider these effects when deciding whether to
issue notifications as traps or informs.
To send an inform to a SNMPv2c host, complete these steps:
1. Enable the SNMP agent (page 775).
2. Create a view with the required notification messages (page 785).
3. Create a group that includes the required notify view (page 782).
4. Allow the switch to send SNMP traps; i.e., notifications (page 778).
5. Specify the target host that will receive inform messages with the
snmp-server host command as described in this section.
To send an inform to a SNMPv3 host, complete these steps:
1. Enable the SNMP agent (page 775).
2. Create a local SNMPv3 user to use in the message exchange
process (page 783).
3. Create a view with the required notification messages (page 785).
4. Create a group that includes the required notify view (page 782).
5. Allow the switch to send SNMP traps; i.e., notifications (page 778).
6. Specify the target host that will receive inform messages with the
snmp-server host command as described in this section.
u The switch can send SNMP Version 1, 2c or 3 notifications to a host IP
address, depending on the SNMP version that the management station
supports. If the snmp-server host command does not specify the
SNMP version, the default is to send SNMP version 1 notifications.
u If you specify an SNMP Version 3 host, then the community string is
interpreted as an SNMP user name. The user name must first be
defined with the snmp-server user command. Otherwise, an SNMPv3
group will be automatically created by the snmp-server host
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