Management Guide - Kamery IP

SNMP Commands4• The snmp-server host command is used in conjunction with thesnmp-server enable traps command. Use the snmp-server enable trapscommand to enable the sending of traps or informs and to specify whichSNMP notifications are sent globally. For a host to receive notifications, atleast one snmp-server enable traps command and the snmp-server hostcommand for that host must be enabled.• Some notification types cannot be controlled with the snmp-server enabletraps command. For example, some notification types are always enabled.• Notifications are issued by the switch as trap messages by default. Therecipient of a trap message does not send a response to the switch. Traps aretherefore not as reliable as inform messages, which include a request foracknowledgement of receipt. Informs can be used to ensure that criticalinformation is received by the host. However, note that informs consume moresystem resources because they must be kept in memory until a response isreceived. Informs also add to network traffic. You should consider theseeffects 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 4-88).2. Allow the switch to send SNMP traps; i.e., notifications (page 4-94).3. Specify the target host that will receive inform messages with thesnmp-server host command as described in this section.4. Create a view with the required notification messages (page 4-96).5. Create a group that includes the required notify view (page 4-98).To send an inform to a SNMPv3 host, complete these steps:1. Enable the SNMP agent (page 4-88).2. Allow the switch to send SNMP traps; i.e., notifications (page 4-94).3. Specify the target host that will receive inform messages with thesnmp-server host command as described in this section.4. Create a view with the required notification messages (page 4-96).5. Create a group that includes the required notify view (page 4-98).6. Specify a remote engine ID where the user resides (page 4-95).7. Then configure a remote user (page 4-100).• The switch can send SNMP Version 1, 2c or 3 notifications to a host IPaddress, depending on the SNMP version that the management stationsupports. If the snmp-server host command does not specify the SNMPversion, the default is to send SNMP version 1 notifications.• If you specify an SNMP Version 3 host, then the community string isinterpreted 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 notexist, and the switch will not authorize SNMP access for the host. However, ifyou specify a V3 host with the “noauth” option, an SNMP user account will begenerated, and the switch will authorize SNMP access for the host.4-93