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Maintenance Commands
193
Forwarding Database maintenance
The Forwarding Database (FDB) Manipulation commands can be used to view information and to delete
a MAC address from the Forwarding Database or clear the entire Forwarding Database. This is helpful in
identifying problems associated with MAC address learning and packet forwarding decisions.
The following table describes the FDB Manipulation commands.
Table 181 FDB Manipulation commands
Command Usage
show mac-address-table
address {<MAC address>}
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 one of
the following:
• xx:xx:xx:xx:xx:xx format (for example: 08:00:20:12:34:56)
• xxxxxxxxxxxx format (for example: 080020123456)
Command mode: All except User EXEC
show mac-address-table port
{<port number>}
Displays all FDB entries for a particular port.
Command mode: All except User EXEC
show mac-address-table vlan
{<1-4095>}
Displays all FDB entries on a single VLAN.
Command mode: All except User EXEC
show mac-address-table
Displays all entries in the Forwarding Database.
Command mode: All except User EXEC
clear mac-address-table
Clears the entire Forwarding Database from switch memory, then adds the
static entries to the Forwarding Database.
Command mode: All except User EXEC
Debugging options
The Miscellaneous Debug commands display trace buffer information about events that can be helpful in
understanding switch operation. You can view the following information using Debug commands:
• Events traced by the management processor (MP)
• Events traced to a buffer area when a reset occurs
If the switch resets for any reason, the management processor (MP) trace buffer is saved into the snap
trace buffer area. The output from these commands can be interpreted by HP technical support.
The following table describes the Miscellaneous Debug commands:
Table 182 Miscellaneous Debug commands
Command Usage
debug mp-trace
Displays the management processor trace buffer. Header information similar to the
following is shown:
MP trace buffer at 13:28:15 Fri May 25, 2002; mask: 0x2ffdf748
The buffer information is displayed after the header.
Command mode: All except User EXEC