SNMP configuration 编辑

The Simple Network Management Protocol (SNMP) network management application, running on an external computer, queries the SNMP agent on the Citrix ADC appliance. The agent searches the management information base (MIB) for data requested by the network management application and sends the data to the application.

SNMP monitoring uses traps messages and alarms. SNMP traps messages are asynchronous events that the agent generates to signal abnormal conditions, which are indicated by alarms. For example, if you want to be informed when CPU utilization is above 90 percent, you can set up an alarm for that condition. The following figure shows a network with a Citrix ADC appliance that has SNMP enabled and configured.

Figure 1. SNMP on the Citrix ADC appliance

The SNMP agent on a Citrix ADC appliance supports SNMP version 1 (SNMPv1), SNMP version 2 (SNMPv2), and SNMP version 3 (SNMPv3). Because it operates in bilingual mode, the agent can handle SNMPv2 queries, such as Get-Bulk, and SNMPv1 queries. The SNMP agent also sends traps compliant with SNMPv2 and supports SNMPv2 data types, such as counter64. SNMPv1 managers (programs on other servers that request SNMP information from the ADC appliance) use the NS-MIB-smiv1.mib file when processing SNMP queries. SNMPv2 managers use the NS-MIB-smiv2.mib file.

The Citrix ADC appliance supports the following enterprise-specific MIBs:

• A subset of standard MIB-2 groups. Provides MIB-2 groups SYSTEM, IF, ICMP, UDP, and SNMP.
• A system enterprise MIB. Provides system-specific configuration and statistics.

To configure SNMP, you specify which managers can query the SNMP agent, add SNMP trap listeners that will receive the SNMP trap messages, and configure SNMP Alarms.

Add SNMP managers

You can configure a workstation running a management application that complies with SNMP version 1, 2, or 3 to access an appliance. Such a workstation is called an SNMP manager. If you do not specify an SNMP manager on the appliance, the appliance accepts and responds to SNMP queries from all IP addresses on the network. If you configure one or more SNMP managers, the appliance accepts and responds to SNMP queries from only those specific IP addresses. When specifying the IP address of an SNMP manager, you can use the netmask parameter to grant access from entire subnets. You can add a maximum of 100 SNMP managers or networks. To add an SNMP manager by using the CLI

At the command prompt, type the following commands to add an SNMP manager and verify the configuration:

add snmp manager <IPAddress> ... [-netmask <netmask>] show snmp manager <IPAddress>

Example:

add snmp manager 10.102.29.5 -netmask 255.255.255.255
Done
show snmp manager 10.102.29.5
10.102.29.5 255.255.255.255
Done
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