Information Commands

Table 18 Layer 2 information commands

 

 

 

 

Command

Usage

 

 

show vlan information

Displays VLAN configuration information, including:

 

•

VLAN Number

 

•

VLAN Name

 

•

Status

 

• Port membership of the VLAN

 

Command mode: All

 

 

show layer2

Dumps all switch information available from Layer 2 memory

 

(10K or more, depending on your configuration).

If you want to capture dump data to a file, set your communication software on your workstation to capture session data prior to issuing the dump commands.

Command mode: All

FDB information commands

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 19 FDB information commands

Command

Usage

 

 

show mac-address-table address

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

<mac-address>

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)

 

Command mode: All

 

 

show mac-address-table port <port

Displays all FDB entries for a particular port.

number>

Command mode: All

 

 

 

show mac-address-table vlan <1-4095>

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

 

1-4095.

 

Command mode: All

 

 

show mac-address-table state

Displays all FDB entries that match a particular state.

{floodforwardifmacignoretrunk

Command mode: All

unknown}

 

 

 

show mac-address-table

Displays all entries in the Forwarding Database.

 

Command mode: All

 

 

 

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