Concept Guide

Each object comprises an OID concatenated with an instance number. In the case of these objects, the instance number is the decimal
equivalent of the MAC address; derive the instance number by converting each hex pair to its decimal equivalent. For example, the decimal
equivalent of E8 is 232, and so the instance number for MAC address 00:01:e8:06:95:ac is.0.1.232.6.149.172.
The value of dot1dTpFdbPort is the port number of the port o which the system learns the MAC address. In this case, of GigabitEthernet
1/21, the manager returns the integer 118.
Example of Fetching MAC Addresses Learned on the Default VLAN Using SNMP
----------------MAC Addresses on Force10 System------------------
DellEMC#show mac-address-table
VlanId Mac Address Type Interface State
1 00:01:e8:06:95:ac Dynamic Gi 1/21 Active
----------------Query from Management Station----------------------
>snmpwalk -v 2c -c techpubs 10.11.131.162 .1.3.6.1.2.1.17.4.3.1
SNMPv2-SMI::mib-2.17.4.3.1.1.0.1.232.6.149.172 = Hex-STRING: 00 01 E8 06 95 AC
Example of Fetching MAC Addresses Learned on a Non-default VLAN Using SNMP
In the following example, GigabitEthernet 1/21 is moved to VLAN 1000, a non-default VLAN. To fetch the MAC addresses learned on non-
default VLANs, use the object dot1qTpFdbTable. The instance number is the VLAN number concatenated with the decimal conversion of
the MAC address.
---------------MAC Addresses on Force10 System------------
DellEMC#show mac-address-table
VlanId Mac Address Type Interface State
1000 00:01:e8:06:95:ac Dynamic Gi 1/21 Active
---------------Query from Management Station----------------
>snmpwalk -v 2c -c techpubs 10.11.131.162 .1.3.6.1.2.1.17.7.1.2.2.1
Example of Fetching MAC Addresses Learned on a Port-Channel Using SNMP
Use dot3aCurAggFdbTable to fetch the learned MAC address of a port-channel. The instance number is the decimal conversion of the
MAC address concatenated with the port-channel number.
--------------MAC Addresses on Force10 System-------------------
DellEMC(conf)#do show mac-address-table
VlanId Mac Address Type Interface State
1000 00:01:e8:06:95:ac Dynamic Po 1 Active
-------------Query from Management Station----------------------
>snmpwalk -v 2c -c techpubs 10.11.131.162 .1.3.6.1.4.1.6027.3.2.1.1.5
SNMPv2-SMI::enterprises.6027.3.2.1.1.5.1.1.1000.0.1.232.6.149.172.1 = INTEGER: 1000
SNMPv2-SMI::enterprises.6027.3.2.1.1.5.1.2.1000.0.1.232.6.149.172.1 = Hex-STRING: 00 01 E8
06 95 AC
SNMPv2-SMI::enterprises.6027.3.2.1.1.5.1.3.1000.0.1.232.6.149.172.1 = INTEGER: 1
SNMPv2-SMI::enterprises.6027.3.2.1.1.5.1.4.1000.0.1.232.6.149.172.1 = INTEGER: 1
Example of Deriving the Interface Index Number
If you know the interface index, use the following commands to nd the interface number.
DellEMC ~ $ snmpwalk -v 2c -c public 10.16.206.127 .1.3.6.1.2.1.2.2.1.2 | grep 2097156
IF-MIB::ifDescr.2097156 = STRING: TenGigabitEthernet 1/1
DellEMC ~ $ snmpwalk -v 2c -c public 10.16.206.127 .1.3.6.1.2.1.31.1.1.1.1 | grep 2097156
IF-MIB::ifName.2097156 = STRING: TenGigabitEthernet 1/1
You can use the show interfaces command to view the interface index.
DellEMC#show interfaces gigabitethernet 1/21
GigabitEthernet 1/21 is down, line protocol is down
Hardware is DellEMCEth, address is f8:b1:56:82:de:70
Current address is f8:b1:56:82:de:70
Pluggable media not present
Interface index is 2097156
858
Simple Network Management Protocol (SNMP)