NEC N8406-022A - Manual (Page 40)

Command Line Interface 40
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 unknown|forward|trunk 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.