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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
413
SNMP notifications, 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.
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:
Enable the SNMP agent (page 4-68).
Allow the switch to send SNMP traps; i.e., notifications (page 4-74).
Specify the target host that will receive inform messages with the snmp-server host command as described in this section.
Create a view with the required notification messages (page 4-77).
Create a group that includes the required notify view (page 4-79).
To send an inform to a SNMPv3 host, complete these steps:
Enable the SNMP agent (page 4-68).
Allow the switch to send SNMP traps; i.e., notifications (page 4-74).
Specify the target host that will receive inform messages with the snmp-server host command as described in this section.
Create a view with the required notification messages (page 4-77).
Create a group that includes the required notify view (page 4-79).
Specify a remote engine ID where the user resides (page 4-75).
Then configure a remote user (page 4-81).
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. If you use the V3
“auth” or “priv” options, the user name must first be defined with the snmp-server user command. Otherwise, the
authentication password and/or privacy password will not exist, and the switch will not authorize SNMP access for the
host. However, if you specify a V3 host with the “noauth” option, an SNMP user account will be generated, and the switch
will authorize SNMP access for the host.
Example