C H A P T E R 8 |
Using Simple Network Management Protocol |
This chapter describes how to use Simple Network Management Protocol [SNMP]. It includes the following sections:
- About SNMP.
- SNMP MIB Files.
- MIBs Integration.
- SNMP Messages.
- Configuring SNMP on the ELOM.
- Managing SNMP User Accounts.
About SNMP
The Sun server supports the Simple Network Management Protocol [SNMP] interface, versions 1, 2c, and 3. SNMP is an open technology that enables the management of networks and devices, or nodes, connected to the network. SNMP messages are sent over IP using the User Datagram Protocol [UDP]. Any management application that supports SNMP can manage your server.
How SNMP Works
Utilizing SNMP requires two components, a network management station and a managed node [in this case, the ELOM]. Network management stations host management applications, which monitor and control managed nodes.
Managed nodes are any number of devices, including servers, routers, and hubs, that host SNMP management agents responsible for carrying out the requests from management stations. The management station monitors nodes by polling management agents for the appropriate information using queries. Managed nodes can also provide unsolicited status information to a management station in the form of a trap. SNMP is the protocol used to communicate management information between the management stations and agents.
The SNMP agent is preinstalled and runs on the ELOM, so all SNMP management of the server should occur through the ELOM. To utilize this feature, your operating system must have an SNMP client application. See your operating system vendor for more information. The SNMP agent on your ELOM provides inventory management and sensor and system state monitoring capabilities.
SNMP MIB Files
The base component of an SNMP solution is the management information base [MIB]. MIB is a text file that describes a managed node’s available information and where it is stored. When a management station requests information from a managed node, the agent receives the request and retrieves the appropriate information from the MIBs. The Sun server supports the following MIB files. Download and install the MIB files from the Tools and Drivers CD. The files are located in the /SNMP/mib directory.
- The system group and SNMP group from RFC1213 MIB
- SNMP-FRAMEWORK-MIB
- SNMP-USER-BASED-MIB
- SNMP-MPD-MIB
- SUN-PLATFORM-MIB
- ENTITY-MIB
MIBs Integration
Use the MIBs to integrate the management and monitoring of the server into SNMP management consoles. The MIB branch is a private enterprise MIB, located at MIB object iso[1].org [3]. dod [6] .internet [1] .private [4] .enterprises [1] .sun [42] .products [2]. See FIGURE 8-1. The standard SNMP port, 161, is used by the SNMP agent on the ELOM.
FIGURE 8-1 Sun Server MIB Tree
SNMP Messages
SNMP is a protocol, not an operating system, so you need some type of application to use SNMP messages. Your SNMP management software might provide this functionality, or you can use an open-source tool like net-SNMP, which is available at //net-snmp.sourceforge.net/.
Both management stations and agents use SNMP messages to communicate. Management stations can send and receive information. Agents can respond to requests and send unsolicited messages in the form of a trap. There are five functions that management stations and agent, use:
- Get
- GetNext
- GetResponse
- Set
- Trap
By default, port 161 is used for SNMP messages, and port 162 is used to listen for SNMP traps.
Configuring SNMP on the ELOM
The ELOM has a preinstalled SNMP agent that supports trap delivery to an SNMP management application.
To use this feature, you must integrate the platform-specific MIBs into your SNMP environment, tell your management station about your server, then configure the specific traps.
Adding Your Server to Your SNMP Environment
Add your Sun server as a managed node using your SNMP management application. See your SNMP management application documentation for further details.
Configuring Receipt of SNMP Traps
Configure a trap in your ELOM. See Managing Alerts, or Configuring E-mail Notification.
Managing SNMP User Accounts
You can add, delete, or configure SNMP user accounts from the CLI. By default, SNMP v3 is enabled, and SNMP v1 and v2c are disabled.
Adding a User Account
To add an SNMP v3 read-only user account, enter the following command:
create /SP/AgentInfo/SNMP/user/username authenticationpassword=password
To add an SNMP v1/v2c user account, enter the following command:
create /SP/AgentInfo/SNMP/communities/communityname
Deleting a User Account
To delete an SNMP v3 user account, enter the following command:
delete /SP/AgentInfo/SNMP/user/username
To delete an SNMP v1/v2c user account, enter the following command :
delete /SP/AgentInfo/SNMP/communities/communityname
Configuring User Accounts
To configure SNMP user accounts, use the set command
Syntaxset target [propertyname=value]
Targets, Properties, and ValuesThese targets, properties, and values are valid for SNMP user accounts.
TABLE 8-1 SNMP Targets, Properties, and Values
/SP/AgentInfo/SNMP/communities/ | Permission | ro|rw | ro |
/SP/AgentInfo/SNMP/users/username | AuthProtocol AuthPassword Permission PrivacyProtocol PrivacyPassword | MD5|SHA string ro|rw None|DES string | MD5 [Null string] ro None* [Null string] |
* If the PrivacyProtocol property has a value other than none, then PrivacyPassword must be set. |
Examples
-> set /SP/AgentInfo/SNMP/users/al privacyprotocol=DES
Tip - To reduce the length of commands, navigate to the target first using the cd command. |
-> cd /SP/AgentInfo/SNMP/users/albert
-> set PrivacyProtocol=DES
-> set PrivacyPassword=password AuthProtocol=SHA AuthPassword=password
Note - You can change SNMP user permissions without resetting the privacy and authentication properties. |
To show an SNMP user’s properties, Enter this command:
-> show
The result appears as follows:
/SP/AgentInfo/SNMP/users/sicilian Targets: Properties: Permission = ro AuthProtocol = MD5 AuthPassword = [Cannot show property] PrivacyProtocol = none PrivacyPassword = [Cannot show property] Target Commands: show set /SP/AgentInfo/SNMP/users/sicilian ->
Embedded Lights Out Manager Administration Guide For the Sun Fire X4150 and X4450 Servers | 820-1855-13 |
Copyright © 2008, Sun Microsystems, Inc. All Rights Reserved.