This presentation gives a general overview of basic SNMP operations and troubleshooting SNMP issues. This presentation is the second of a three part series - SNMP Demystified.

1. IT Management,
Simplified
Real-time IT management solutions for the new
speed of business

2. SNMP Demystified
- Part II
KARTHIK ANANDARAO
Sr. Product Consultant/Evangelist
ManageEngine

3. About me
• Senior Product Consultant and Evangelist
for ManageEngine. With Engineering and
MBA degrees from reputed Indian
Institutions,
• With over 17 years of IT Experience,
serving in different capacities including
System and Network Administration, IT
Management, and Consulting.
• Have travelled across the globe for
implementation, consultation and training
of ManageEngine products and solutions.

4. Join us soon
• Join us @ SNMP Nuts & Bolts
• https://connect.manageengine.com/groups/s
nmp-nuts-and-bolts
• SNMP Demystified - Part 1
• Video URL - http://bit.ly/1G2AT6u
• Presentation URL - http://bit.ly/1CrykqB

5. Agenda
• SNMP Demystified – Part 2
• Recap
• SNMP Tools
• Enable SNMP
• SNMP Walk
• Understand SNMP Table
• Receive Traps
• Check Community Strings
• Browse MIBS
• Perform SNMP Operations
• Troubleshoot SNMP
• Understand Error Messages

6. SNMP - Recap
• Simple Network Management Protocol
• Internet Standard Protocol to manage devices
on IP Networks
• Standard way of monitoring hardware and
software from any manufacturer from Cisco to
Juniper, from Microsoft to Unix.
• Has 3 components
• SNMP Manager – Monitoring solutions, NMS or EMS
• SNMP Agent - collects Management Information
• Managed Device – could be a network device or a
server or any device with an IP and SNMP Agent

7. SNMP - Recap
• Simple Network Management Protocol
• Has 3 versions
• SNMPv1
• SNMPv2c
• SNMPv3
• For enhanced security, administration and remote
configuration
• SNMP entity has an identifier – SNMPEngineID
• OIDs and MIBs
• OID is Object Identifier, defined in MIBs, Unique, can
be scalar or tabular and a dotted list of integers
• MIB is Management Information Base, collection of
OIDs.

8. ManageEngine SNMP Tools
• SNMP Tools
• ManageEngine SNMP MIB Browser
• ManageEngine Free Windows SNMP Enabler

9. Enable SNMP
• Windows
• Programs / Features – Turn on/off Windows
feature
• Linux
• Net-snmp
• Cisco devices
• #configure terminal
#snmp-server community
<community_string> rw/ro (example: snmp-
server community public ro)
#end
#copy running-config startup-config

10. Enable SNMP
• ManageEngine Windows SNMP Enabler
• Free
• Install / Enable SNMP on Windows machines
• Start / Stop SNMP Service
• Walk-through on the tool.

11. SNMP Tools
• ManageEngine SNMP MIB Browser
• Load/unload MIBs and fetch MIB data of SNMP(v1, v2c,
v3) agents
• Perform SNMP operations from Windows, Linux and Mac
devices
• Parse traps based on pre-defined match criteria
• View traps from SNMP agents and set up alert emails
• Leverage SNMPv3 security as defined in USM and VACM
standards
• View SNMP Table data and get graphical representation
in real-time
• Get the complete list of OIDs implemented on your
device

12. ManageEngine SNMP MIB
Browser

13. Understand SNMP Table
• SNMP Table
• A related group of OIDs for a performance
attribute
• Examples
• ifTable
• ipaddrTable

14. SNMP Walk
• SNMP response at-one-go for a group of
OIDs

15. Receive Traps
• Configure to receive Traps in
ManageEngine MIB Browser Tool
• Trap Destination
• Trap Community String

16. Check Community String
• Configure a community string
• Accept SNMP from certain hosts – security
configuration

17. Browse MIBS
• Copy MIBS and load them

18. Perform SNMP Operations
• GET
• GET-NEXT
• SET
• TABLE
• SNMPWALK
• Let us see how to do these using
ManageEngine SNMP MIB Browser

19. Troubleshoot SNMP
• Troubleshoot SNMP
• Check community string
• Firewall configuration, if any
• Trap port occupied by some other application
• Allow SNMP from the host specified
• Check SNMP timeout
• Increase retries
• Check supported MIBs for device type

20. Understand Error messages
• Standard Error Messages
• Request Failed : Error: Request timed out to
192.168.101.101
• SNMP is not enabled or configured
• Community String is incorrect
• Firewall blocks SNMP on port 161
• No data available in this sub-tree
• Agent is not configured with the MIB details
• Request Failed: Get Response PDU received
from 127.0.0.1 Error Indication in response:
There is no such variable name in this mib.
Errindex: 1
• SNMP Agent cannot find such a MIB variable in its
database

21. Understand Error messages
• Standard Error Messages
• Could not parse the file
H:/mibs/CHECKPOINT-MIB.mib – couldn’t
resolve these sequence constructs :
{cpvTnIMonEntry,fwIfEntry}
• Demo
• Loading MIBs Failed : Imports failed : Could
not find the file : H:/mibs/APPLICATION-MIB
• Demo

22. ManageEngine SNMP MIB
Browser
• Website
 http://www.manageengine.com/products/mibbrowser-
free-tool/
• Download
 http://www.manageengine.com/products/mibbrowser-
free-tool/download.html
• Features
 http://www.manageengine.com/products/mibbrowser-
free-tool/features.html
• FAQ
 http://www.manageengine.com/products/mibbrowser-
free-tool/faq.html
• Feedback
 http://www.manageengine.com/products/mibbrowser-
free-tool/feedback.html

23. ManageEngine SNMP
Community
• Join us @ SNMP Nuts & Bolts
• https://connect.manageengine.com/groups/s
nmp-nuts-and-bolts
• An online community
• Share SNMP MIBs
• Upload MIBs to the community to fix errors
• Share your thoughts on SNMP
• Accept the group invite
• ManageEngine’s MIB Database
• Short URL - http://bit.ly/1mgRTb9

24. Thank You