Installation manual

4-88
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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 4-84).
2. Allow the switch to send SNMP traps; i.e., notifications (page 4-89).
3. Specify the target host that will receive inform messages with the snmp-server
host command as described in this section.
4. Create a view with the required notification messages (page 4-91).
5. Create a group that includes the required notify view (page 4-93).
To send an inform to a SNMPv3 host, complete these steps:
1. Enable the SNMP agent (page 4-84).
2. Allow the switch to send SNMP traps; i.e., notifications (page 4-89).
3. Specify the target host that will receive inform messages with the snmp-server
host command as described in this section.
4. Create a view with the required notification messages (page 4-91).
5. Create a group that includes the required notify view (page 4-93).
6. Specify a remote engine ID where the user resides (page 4-90).
7. Then configure a remote user (page 4-95).
• 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.