FDB information menu

Command: /info/l2/fdb

[Forwarding Database

Menu]

find

- Show

a single FDB entry by MAC address

port

- Show

FDB entries on a single port

vlan

- Show

FDB entries on a single VLAN

state

- Show

FDB entries by state

dump

- Show

all FDB entries

 

 

 

The forwarding database (FDB) contains information that maps the media access control (MAC) address of each known device to the switch port where the device address was learned. The FDB also shows which other ports have seen frames destined for a particular MAC address.

NOTE: The master forwarding database supports up to 8K MAC address entries on the management processor (MP) per switch.

Table 28 FDB information menu

Command

Usage

find <MAC address> [<VLAN>]

Displays a single database entry by its MAC address. You are

 

prompted to enter the MAC address of the device.

 

Enter the MAC address using the format: xx:xx:xx:xx:xx:xx. (For

 

example: 08:00:20:12:34:56)

 

You can also enter the MAC address using the format: xxxxxxxxxxxx.

 

(For example: 080020123456)

port <port number>

Displays all FDB entries for a particular port.

vlan <1-4095>

Displays all FDB entries on a single VLAN. The range is 1-4095.

state unknownforwardtrunk

Displays all FDB entries that match a particular state.

dump

Displays all entries in the Forwarding Database.

Show all FDB information

Command: /info/l2/fdb/dump

MAC address

VLAN

Port

Trnk

State

-----------------

----

----

----

-----

00:02:01:00:00:00

300

 

1

TRK

00:02:01:00:00:01

300

23

 

FWD

00:02:01:00:00:02

300

23

 

FWD

00:02:01:00:00:03

300

23

 

FWD

00:02:01:00:00:04

300

23

 

FWD

00:02:01:00:00:05

300

23

 

FWD

00:02:01:00:00:06

300

23

 

FWD

00:02:01:00:00:07

300

23

 

FWD

00:02:01:00:00:08

300

23

 

FWD

00:02:01:00:00:09

300

23

 

FWD

00:02:01:00:00:0a

300

23

 

FWD

00:02:01:00:00:0b

300

23

 

FWD

00:02:01:00:00:0c

300

23

 

FWD

 

 

 

 

 

An address that is in the forwarding (FWD) state indicates that the switch has learned it. When in the trunking (TRK) state, the Trnk field displays the trunk group number. If the state for the port is listed as unknown (UNK), the MAC address has not yet been learned by the switch, but has only been seen as a destination address. When an address is in the unknown state, no outbound port is indicated.

Clearing entries from the forwarding database

To delete a static MAC address from the forwarding database (FDB), see the “Static FDB configuration” section in the “Configuration Menu” chapter. To clear the entire forwarding database (FDB), see the “Forwarding Database options” section in the “Maintenance Menu” chapter.

Command Line Interface 40