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SNMP Object Navigator Help

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SNMP Object Navigator Help

SNMP and MIBs
SNMP Object Navigator Overview
Tool Features
      - Translate Objects
      - Search/Browse
      - View & Download MIBs
      - MIB Support in Software
Example Scenario
      - Step 1. Search for the MIB in the VIEW & DOWNLOAD MIBS Tab
      - Step 2. Search for the MIB in the SEARCH Tab
      - Step 3. Check to see if the Image Supports the MIB with the MIB SUPPORT IN SOFTWARE Tab
      - Step 4. Browse the MIB with the TRANSLATE/BROWSE Tab

SNMP and MIBs

The Simple Network Management Protocol (SNMP) is an application-layer protocol that facilitates the exchange of management information between network devices. It is part of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. SNMP enables network administrators to manage network performance, find and solve network problems, and plan for network growth.

A Management Information Base (MIB) is a collection of information objects, organized hierarchically. MIBs are accessed using a network-management protocol such as SNMP. They are comprised of managed objects and are identified by object identifiers. A managed object (sometimes called a MIB object, an object, or a MIB) is one of any number of specific characteristics of a managed device. Managed objects are comprised of one or more object instances, which are, in essence, variables.

For more information on SNMP, visit the SNMP technology guide.

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SNMP Object Navigator Overview

Network devices support thousands of MIB objects that can help you configure, monitor, and troubleshoot your network. However, it can be a challenge to get the correct information. MIB files are difficult to read and can have very complex structures. The SNMP Object Navigator can help you locate MIBs, understand how a MIB works, and give you instructions on how to use these MIBs.

This document describes an example scenario of how to use SNMP Object Navigator to get to the relevant information in a MIB.

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Tool Features

Translate Objects

The Translate tab features allow you to translate an object identifier (OID) into an object name (or an object name into an OID) to receive object details. You can quickly identify all information regarding an object. You can use this feature if you already know the name of the object or the OID.

Examples of allowed input are shown here.

  • ifindex
  • 1.3.6.1.2.1.2.2.1.1
  • interfaces.ifTable.1.1

By clicking Translate, detailed information about the object will be shown. This information is taken from the MIB in which the object is defined. If the object is unknown, the browser will try to suggest objects with similar names or it will suggest you to do a search for the object.

Interpreting the Detailed Information

The SNMP Object Navigator shows all information defined in any given MIB. The information displays in an easy to understand manner.

If an information field in an object contains the name of another object or type, you can immediately view that object by clicking on it.

The definition of the fields can be found in the SNMP RFC.

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Search/Browse

On the Search/Browse tab, you can search object names and descriptions, or you can browse the hierarchical MIB tree.

Search

If you do not know the object you are looking for, enter your search terms in the text box and click Search to look for the object in the repository. You can search object names and descriptions to receive a list of matching objects and MIBs.

You can refine your query using the following operators.

  • AND
  • OR

Note: These operators must be typed in capital letters.

Here is an example of a search using operators.

  • unique AND interface AND index

This query will look for any objects that have all three of the terms unique, interface and index in any object name or description. The search results will show the object name and a small part of the object descriptions. Click on the object name to view detailed object information.

Browse

The object tree shows a graphical representation of all the objects. The tree starts with the first defined object (iso). From there, the tree is constructed to display all objects up to the object that you are looking for.

By clicking on the + or - symbols, you can expand or collapse a certain branch of the tree. Clicking on an object name expands the tree, highlights where in the tree the object lives, and allows you to navigate to the top of the screen to see the detailed object information by clicking on the object details link next to the object name in the tree.

Use the drop-down menu to collapse or expand the number of levels in the view of the tree. A collapsed view allows better tool performance, while an expanded view shows more tree detail and context.

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View & Download MIBs

The View and Download MIBs tab allows you to select a MIB and perform the following actions.

  • View MIB dependencies

    View a list of MIBs that need to be downloaded and compiled in the specified order before the MIB in question.

  • Download a MIB

    Download the MIB from the Cisco MIB repository.

  • View MIB contents

    Look at a formatted view of the MIB contents. This version is easier to view than the MIB file itself and provides links to all detailed object information provided in the Translate tab results.

Other Places to Download MIBs

MIB files can be downloaded from various places, such as online repositories, CD-ROMs, and inside compilers.

  • Online Repository

    On ftp.cisco.com/pub/mibs/ you can find most of the Cisco MIBs. The SNMP Object Navigator reads its information from here.

    Another online repository is at www.ietf.org.

  • CD-ROM

    Some MIB files are not available for download from the Internet. You will find these MIB files on the CD-ROM that comes with your product. Please look at the CD-ROM you received with your product to find the MIB if you cannot find it with this tool.

  • Included in Compiler

    All SNMP objects are defined in MIB files. Most compilers, however, already have some SNMP objects precompiled in their databases. Mostly, they already contain the objects at the top of the hierarchy of the tree. Examples of this are ISO (1) and internet (.1.3).

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MIB Support in Software

This tab allows you to find software in a variety of ways.

  • Find MIBs supported in a Cisco IOS software image

    Enter an image name and click Search to receive a list of MIBs supported in that image. You can access detailed MIB information, including compiling dependencies, download information, and a formatted view of the MIB contents. (This is similar to what the View & Download MIBs tab does.)

  • Find all Cisco IOS versions that support a MIB

    This part of the tool points to the MIB Locator Tool, where you can find MIBs in Cisco IOS software releases.

  • Find MIBs supported in non-IOS Cisco Products

    Refer to the Network Management Software Center to get information about which MIBs are supported by which Cisco products.

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Example Scenario

A user wants to create a report on their network management system (NMS) that monitors the memory usage of a Cisco 7507 router and is not sure what object identifier (OID) to give it. The user searches for the MIB objects that provide the 'Used(b)' value from the show processor memory command.

7507#show processor memory
                        Head        Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
            Processor   436BAC40    76829404    27720944    49108460     5264796    43274976
            Fast        4369AC40      131072       76128      54944      54944       54912

How can the user monitor memory utilization on their Cisco 7507 router with SNMP?

These are the steps used to solve this example scenario. These steps are described in detail in this document.

  • Step 1. Search for the MIB in the VIEW & DOWNLOAD MIBS tab.
  • Step 2. Search for the MIB in the SEARCH tab.
  • Step 3. Check to see if the image supports the MIB with the MIB SUPPORT IN SOFTWARE tab.
  • Step 4. Browse the MIB with the TRANSLATE/BROWSE tab.

Step 1. Search for the MIB in the VIEW & DOWNLOAD MIBS Tab

Use the VIEW & DOWNLOAD MIBS tab to see if there is a MIB that is named after the object that you are looking for. If you are looking for open shortest path first (OSPF) information, search for an OSPF MIB. If you are looking for VLAN information, search for VLAN, VTP, bridge, and so forth.

This example procedure searches for a MIB on memory.

  1. Go to the VIEW & DOWNLOAD MIBS tab.
  2. Enter memory as a string.
  3. Click List matching MIBs.

    This is the result list for memory:

  4. The SNMP Object Navigator found two MIBs:

    • CISCO-MEMORY-POOL-MIB
    • OLD-CISCO-MEMORY-MIB

    Select one of the MIBs and click Submit to see if the MIB matches what you are looking for.

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Step 2. Search for the MIB in the SEARCH Tab

If the result from the VIEW & DOWNLOAD MIBS tab in Step 1 is not what you were looking for, use the SEARCH tab.

  1. Go to the SEARCH tab.
  2. Enter memory as string.
  3. Click Search.
  4. You can use AND and OR to refine your searches. Use the Include object descriptions in search option to broaden your search with the inclusion of the MIB description in your search.

    This screen displays the result of this search:

  5. SNMP Object Navigator displays two results:

    • ciscoMemoryPoolUsed "Indicates the number of bytes from the memory pool that are currently in use by applications on the managed device."
    • ibmappnMemoryUsed "Number of bytes in the segment that are currently allocated to process."...

    Click on the description that is the best match. In this example, it is ciscoMemoryPoolUsed object.

  6. The description that appears confirms that this is the desired object.

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Step 3. Check to see if the Image Supports the MIB with the MIB SUPPORT IN SOFTWARE Tab

If the software on your devices does not support the MIB, it is not useful. Click on the View Supporting Images link and verify that your image is listed.

Since the desired CISCO-MEMORY-POOL-MIB is supported in the image, you can start investigating.

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Step 4. Browse the MIB with the TRANSLATE/BROWSE Tab

  1. View the More Information link at the bottom of the page.

    Some MIB objects are linked to Technical Notes that provide a manual on how to use the MIB. Make sure you read this information if it is provided. It makes your testing much easier.

    This screen also provides an OID that you can test on your Cisco 7507 router:

  2. Use the snmpwalk tool to get information from the router:
       # snmpwalk -c public 7507 .1.3.6.1.4.1.9.9.48.1.1.1.5
       ciscoMemoryPoolUsed.1 : Gauge32: 27722088
       ciscoMemoryPoolUsed.4 : Gauge32: 76128

    The router returns two values:

    • ciscoMemoryPoolUsed.1
    • ciscoMemoryPoolUsed.4

    You need to find out what the .1 and the .4 mean. These values are indexes. MIBs use the Table, Entry and Object format to describe tables:

    +-- Table
     |
     + -- Entry
      |
       +-- Object

    The Entry defines the indexes. Look at the description of this Entry object to find out how the ciscoMemoryPoolUsed is indexed.

  3. Scroll down on the SNMP Object Navigator to look at the table structure.

  4. The Entry object for ciscoMemoryPoolUsed is ciscoMemoryPoolEntry. Click on this object to see the index.

  5. The table is indexed by ciscoMemoryPoolType. Click on the ciscoMemoryPoolType link for a definition.

    The CiscoMemoryPoolType has type CiscoMemoryPoolTypes.

    In other words, this index type is described by another type. Continue with your search until you reach a type that you can understand. A click on the CiscoMemoryPoolTypes link displays a screen that describes this type in detail.

    Type 1 is used for processor memory. Type 4 is used for fast memory. Since the ciscoMemoryPoolUsed is indexed by these types, you can interpret the results from the router:

    # snmpwalk -c public 7507 .1.3.6.1.4.1.9.9.48.1.1.1.5
            ciscoMemoryPoolUsed.1 : Gauge32: 27722088	------> processor memory
            ciscoMemoryPoolUsed.4 : Gauge32: 76128		------> fast memory

    Some MIBs are more complex than others. Read the descriptions on the Indexes and Types to get to your desired location.

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