Snmp Tool For Mac

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Contents

Introduction

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This document describes how to use Simple Network Management Protocol (SNMP) to obtain the port number on a Cisco Catalyst switch from which you know the MAC address.

Prerequisites

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Requirements

Readers of this document should have knowledge of these topics:

  • Cmos setup utility download. How to get VLANs from a Catalyst switch with use of SNMP

  • How to use community string indexing with SNMP

  • General use of the SNMP get command and walk command

Components Used

This document applies to Catalyst switches that run regular Catalyst OS (CatOS) or Cisco IOS® Software. The software supports the BRIDGE-MIB and the IF-MIB.

The information in this document is based on these software and hardware versions:

  • Catalyst 3524XL that runs Cisco IOS Software Release 12.0(5)WC5a

  • Net-SNMP version 5.0.6

    Note: To obtain this software, refer to Net-SNMP .

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to the Cisco Technical Tips Conventions.

Background

For more information on how to query the content-addressable memory (CAM) table, VLANs, and all related MIBs, such as the CISCO-VTP-MIB and the BRIDGE-MIB, refer to the Background section of the document How To Get Dynamic CAM Entries (CAM Table) for Catalyst Switches Using SNMP.

Snmp tool mac osTool

Details of the MIB Variables, Which Includes Object Identifiers (OIDs)

Get the Port Number on Which a MAC Address Has Been Learned

Step-by-Step Instructions

Complete the steps in this section in order to use SNMP to get the port number on which a MAC address has been learned. Consider that the port number is in VLAN1.

Note: In the commands in this section:

  • public is the read community string.

  • @1 is the VLAN 1 part of the read community string.

  • crumpy is the device host name.

    Note: You can also use the IP address for this host name.

Note: The Conclusion section uses the values that appear in italics in the command output.

  1. Retrieve the VLANs. Use the snmpwalk command on the vtpVlanState object (.1.3.6.1.4.1.9.9.46.1.3.1.1.2 ):

    Note: This command uses community string indexing. The command also uses vtpVlanState, which has OID .1.3.6.1.4.1.9.9.46.1.3.1.1.2. If you have loaded the MIBs to your network management system (NMS), you can use the object name instead of the OID. Issue this command instead:

    Note: You can also use the object names in steps 2 through 6.

  2. Issue this command in order to obtain the MAC address table by considering that the port belongs to VLAN1:

    Stp file viewer for mac os x. Note: Provide the appropriate VLAN number after the community string. In this example, it is VLAN1.

    The command lists all MAC addresses that have been learned on all ports that belong to VLAN 1.

  3. Issue this command to determine the bridge port number for VLAN 1:

    Note: VLAN 1 is dot1dTpFdbPort , or .1.3.6.1.2.1.17.4.3.1.2.

  4. Issue this command to map the bridge port to the ifIndex, OID .1.3.6.1.2.1.2.2.1.1:

    This command queries the dot1dBasePortIfIndex, which has OID .1.3.6.1.2.1.17.1.4.1.2.

  5. Use the walk command with ifName in order to correlate the ifIndex value with a correct port name.

    Issue this command:

    Note: The ifName has OID .1.3.6.1.2.1.31.1.1.1.1.

  6. Link a MAC address to the port on which the address was learned.

    • From Step 1, the MAC address is:

    • From Step 2, the bridge port tells that the MAC address belongs to bridge port number 13:

    • From Step 3, the bridge port number 13 has ifIndex number 2:

    • From Step 4, the ifIndex 2 corresponds to port Fast Ethernet 0/1:

Conclusion

Snmp Client For Mac

The MAC address 00 00 0C 07 AC 08 is learned on port Fa0/1.

Compare this conclusion with output from:

  • The show cam dynamic command for CatOS switches

  • The show mac command for Cisco IOS Software switches

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Here is the sample output:

Snmp Tool For Mac Os

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