Home
Add Document
Sign In
Create An Account
Viewer
Transcript
Using NET-SNMP with A91750 Application Note
Edition 1.10 Issued May 24th 2011
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Document revision Date
Description
Author
20110524
Creating the document.
Michael Arp Sørensen
20110607
Added example with short output form
Michael Arp Sørensen
20130131
Adding examples to get and set informations
Michael Arp Sørensen
20130620
Adding examples and documentation on setting Trap Destination.
Michael Arp Sørensen
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Table of Content Introduction Description of NET-SNMP Prerequisites Configuring NET-SNMP Using NET-SNMP Example 1 Showing the Channel Info tabel Example 2 Get a value from an OID Example 3 Set Trap Destination IP address in table entry 1 Example 4 Set Trap Destination Community string in table entry 1 Example 5 Set Trap Destination RowStatus in table entry 1 Example 6 Table of Trap Destination setting Description of Trap Destination OID’s Conclusion
Introduction This Application Note is about the use of net-snmp tool. Even though net-snmp is a multi-platform application, the examples shown in this document is from a Linux computer. Most Linux distributions will most likely have net-snmp in their application repository, so it’s very easy to install. On Windows you need to download and install it your self. For this document it is assumed that you know about SNMP already.
Description of NET-SNMP Net-snmp is a command line tool for retrieving and showing SNMP data from a remote agent.
Prerequisites Install NET-SNMP on your computer. Download the MIB files from Innocom Support homepage using this link: http://mibfiles.innocom.dk.
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Configuring NET-SNMP The only configuration necessary is to put your MIB files in a folder that is in the search path of MIB files. On Linux the files is stored in: /home/USERNAME/.snmp/mibs/ For windows, please look through the official documentation here: h ttp://www.net-snmp.org/wiki/.
Using NET-SNMP List of commands in NET SNMP: ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
agentxtrap encode_keychange fixproc ipf-mod.pl mib2c mib2c-update net-snmp-cert net-snmp-config net-snmp-create-v3-user snmp-bridge-mib snmpbulkget snmpbulkwalk snmpcheck snmpconf snmpdelta snmpdf snmpget snmpgetnext snmpinform snmpnetstat snmpset snmpstatus snmptable snmptest snmptranslate snmptrap snmpusm snmpvacm snmpwalk tkmib traptoemail
For the most part, only a few of them is relevant.
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Example 1 Showing the Channel Info tabel
The command snmptable is the one to use for this example. The full command is this: snmptable -Cbl -m all -v 2c -c ro1user 192.168.0.40 .1.3.6.1.4.1.1482.20.3.3.4.2.1
Here’s a break down of all the used parameters: -Cbl
Shows only brief field names with left justify output.
-m all
Load all MIB files in the path. This could be overkill and give a lot of overhead in running the command. Especially if you have many MIB files.
-v 2c
Specify SNMP version. In this example we use version 2 community. This means that authentication is backward compatible with SNMP version 1.
-c ro1user
Specify the READ Community.
192.168.0.40
The host/SNMP agent we want data from.
.1.3.6.1.4.1.1482.20.3.3.4.2.1
The OID for the ChannelInfoTable
The output of the command: As text (truncated to save space) snmptable -Cbl -m all -v 2c -c ro1user 192.168.0.40 .1.3.6.1.4.1.1482.20.3.3.4.2.1 SNMP table: SA-EUROPE-A91750-MIB::cmChannelInfoTable Index Frequency TypeOfCarrier Name Location Description GroupTable MinorLower MinorUpper MajorLower MajorUpper BelowDynamicRange ExceedsDynamicRange Measure Alarm Backup StatusAlarm ActualLevel CorrectedLevel CorrectionLevel ExpectedLevel LastMeasured 2 900000 fm "Sky Radio" "Primary site" "Public Service Radio." 0 -20 20 -100 100 350 850 enabled disabled disabled noalarm 655 655 0 656 1306394156 31 6180000 amvsb "CNN" "Primary site" "News from around the world." 0 -20 20 -100 100 390 890 enabled disabled disabled noalarm 683 683 0 682 1306394156
As text in a short form snmptable -Cl -CH -Cf ";" -m all -v 2c -c ro1user 192.168.0.39 .1.3.6.1.4.1.1482.20.3.3.4.2.1 2;900000;fm;"Sky Radio";"Primary site";"Public Service Radio.";0;-20;20;-100;100;350;850;enabled;disabled;disabled;noalarm;657;657;0;656;1307458693 10;2942500;amvsb;"BBC";"Primary site";"BBC";0;-20;20;-100;100;350;850;enabled;disabled;disabled;bdr;167;167;0;700;1307458694 11;4700000;unmodulated;"Pilot";"Primary site";"Reference level";0;-20;20;-100;100;350;850;enabled;disabled;disabled;noalarm;438;438;0;435;1307458694
As an image
Obviously, the output is to wide because of the many columns, that it can’t be shown here as characters but only as a picture. If you run this command on linux: Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
watch -d -n 60 snmptable -Cbl -m all -v 2c -c ro1user 192.168.0.40 .1.3.6.1.4.1.1482.20.3.3.4.2.1
watch -d -n 60 shows the output in 60 seconds interval and the changed values are highlighted. This is usefull for following changes. But it’s not suited for seeing changes over time. For that you need a Network Management System.
Example 2 Get a value from an OID
This example shows how to get a value from an OID. In this case we get the IP address for trap destination. snmpget -m all -v 2c -c ro1user 192.168.1.46 .1.3.6.1.4.1.1482.20.1.9.1.1.2.3
Description: Object ID
Example 3 Set Trap Destination IP address in table entry 1 This example shows how to set an IP address for the trap destination:
# snmpset -m all -v 2c -c rw1user 192.168.1.46 .1.3.6.1.4.1.1482.20.1.9.1.1.2.3 a 192.168.1.10
Description: Object ID Data type: a (IP address) Data: the data we want to store
Example 4 Set Trap Destination Community string in table entry 1 This example shows how to set a Community string for the trap destination:
# snmpset -m all -v 2c -c rw1user 192.168.1.46 .1.3.6.1.4.1.1482.20.1.9.1.1.3.1 s rw1user
Description: Object ID Data type: s (string) Data: the data we want to store
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Example 5 Set Trap Destination RowStatus in table entry 1 This example shows how to set a RowStatus for the trap destination:
# snmpset -m all -v 2c -c rw1user 192.168.1.46 .1.3.6.1.4.1.1482.20.1.9.1.1.3.1 i 1
Description: Object ID Data type: i (integer) Data: the data we want to store. See description of TrapDestination below for meaning of integer values.
Example 6 Table of Trap Destination setting This example shows how display the table of Trap Destination settings:
# snmptable -Cbl -m all -v 2c -c ro1user 192.168.1.46 .1.3.6.1.4.1.1482.20.1.9.1
Description: Object ID Output: SNMP table: SAEUROPE-TRAPDESTINATION-MIB::trapDestinationsTable Index 1 2 3 4 5 6 7 8 9 10
IpAddr 192.168.1.80 192.168.1.24 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
CommunityString rw1user
RowStatus active notReady notInService notInService notInService notInService notInService notInService notInService notInService
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Description of Trap Destination OID’s .1 tdIndex Type: Access: Status: Description: .2 tdIpAddr Type: Access: Status: Description:
Integer32 (1..10) read-only current Index of the trap destinations table. IpAddress read-write current The IP address of the trap destinations.
.3 tdCommunityString Type: OCTET STRING (0..30) Access: read-write Status: current Description: Community string used to send traps. Blank characters are not allowed at the beginning or in the middle of the string. Blank characters at the end are ignored. If length of the community string is zero, traps are not sent to the particular destination, even if that destination is used. .4 tdRowStatus Type: INTEGER { active(1), notInService(2), notReady(3), createAndGo(4), createAndWait(5), destroy(6) } Access: read-write Status: current Description: To be used for creating and deleting rows in this table. Source: https://mimir.fcom.ch/wwwbin/snmpnav.pl?oid=1.3.6.1.4.1.1482.20.1.9.1.1.1
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Conclusion NET-SNMP is a collection of simple tools to get or set SNMP data on a SNMP agent. Using these tools can come in handy if you’re working out in the fields or if you don’t have a more advanced SNMP browser or Network Management System like ROSA. By using command line tools it is possible to write scripts to do simple tasks for you. More examples will be included in the future.
Innocom-arcodan ApS - AN-A91750-01_Application_Note_Using_NET-SNMP_with_A91750 - 01
Using NET-SNMP with A91750
Creating
the document. Michael Arp ... most likely have net-snmp in their
application
repository, so it's very easy to install. On
Windows
you ... For
windows
, please look through the official documentation here: âhttp://www.net-snmp.org/
wiki/â.
Download PDF
215KB Sizes
2 Downloads
228 Views
Report
Recommend Documents
No documents
×
Report Using NET-SNMP with A91750
Your name
Email
Reason
-Select Reason-
Pornographic
Defamatory
Illegal/Unlawful
Spam
Other Terms Of Service Violation
File a copyright complaint
Description
×
Sign In
Email
Password
Remember Password
Forgot Password?
Sign In