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Table 61. MIB Objects for Fetching Dynamic MAC Entries in the Forwarding Database

MIB Object OID MIB Description

dot1dTpFdbTable .1.3.6.1.2.1.17.4.3 Q-BRIDGE MIB List the learned unicast

MAC addresses on the

default VLAN.

dot1qTpFdbTable .1.3.6.1.2.1.17.7.1.2. 2 Q-BRIDGE MIB List the learned unicast

MAC addresses on non-

default VLANs.

dot3aCurAggFdb Table .1.3.6.1.4.1.6027.3.2. 1.1.5 F10-LINK-

AGGREGATION -MIB

List the learned MAC

addresses of aggregated

links (LAG).

In the following example, R1 has one dynamic MAC address, learned off of port GigabitEthernet 1/21,

which a member of the default VLAN, VLAN 1. The SNMP walk returns the values for dot1dTpFdbAddress,

dot1dTpFdbPort, and dot1dTpFdbStatus.

Each object is comprised of 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 off which the system learns the MAC address.

In this case, of TenGigabitEthernet 1/21, the manager returns the integer 118.

Example of Fetching MAC Addresses Learned on the Default VLAN Using SNMP

Example of Fetching MAC Addresses Learned on a Non-default VLAN Using SNMP

Example of Fetching MAC Addresses Learned on a Port-Channel Using SNMP

-----------------------------MAC Addresses on Dell Networking

System-------------------------------

Dell#show mac-address-table

VlanId Mac Address Type Interface State

1 00:01:e8:06:95:ac Dynamic Tengig 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

SNMPv2-SMI::mib-2.17.4.3.1.2.0.1.232.6.149.172 = INTEGER: 118

SNMPv2-SMI::mib-2.17.4.3.1.3.0.1.232.6.149.172 = INTEGER: 3

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.