CLI Reference Guide-R04

Chapter 5 | SNMP Commands
SNMP Target Host Commands
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◆ 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.
◆ Some notification types cannot be controlled with the snmp-server
enable traps command. For example, some notification types are always
enabled.
◆ 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 191).
2. Create a view with the required notification messages (page 204).
3. Create a group that includes the required notify view (page 201).
4. Allow the switch to send SNMP traps; i.e., notifications (page 194).
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 191).
2. Create a remote SNMPv3 user to use in the message exchange process
(page 202).
3. Create a view with the required notification messages (page 204).
4. Create a group that includes the required notify view (page 201).
5. Allow the switch to send SNMP traps; i.e., notifications (page 194).
6. Specify the target host that will receive inform messages with the snmp-
server host command as described in this section.
◆ 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.
◆ 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 command using the name of the specified
community string, and default settings for the read, write, and notify view.