Forwarding Database
ExtremeWare XOS 11.3 Concepts Guide
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Configuring the FDB Aging Time
You configure the aging time for dynamic FDB entries using the following command:
configure fdb agingtime <seconds>
If the aging time is set to zero, all aging entries in the database are defined as static, nonaging entries.
This means the entries will not age out, but non-permanent static entries can be deleted if the switch is
reset. Supported aging is between 15 and 1,000,000 seconds. The default is 5 minutes (300 seconds).
Clearing FDB Entries
You clear dynamic and permanent entries using different CLI commands.
You clear dynamic FDB entries by targeting:
● specified MAC addresses
● specified ports
● specified VLANs,
● all blackhole entries
Use the following command to clear dynamic entries from the FDB:
clear fdb {<mac_addr> | ports <port_list> | <vlan_name> | blackhole}
You clear permanent FDB entries by targeting:
● all permanent entries
● specified MAC addresses
● specified VLANs
● all blackholed entries
Use the following command to clear permanent entries from the FDB:
delete fdbentry [all | <mac_address> [vlan <vlan name>]
Displaying FDB Entries
To display FDB entries, use the following command:
show fdb {<mac_addr> {netlogin [all | mac-based]}| permanent {netlogin [all | mac-
based]} | ports <port_list> {netlogin [all | mac-based]}| vlan <vlan_name> {netlogin
[all | mac-based]} | stats | netlogin {all | mac-based]}}
where the following is true:
● mac_address—Displays the entry for a particular MAC address.
● netlogin—Displays all FDBs created as a result of the netlogin process: you can display all of these
entries or just the netlogin MAC-based VLAN FDB entries.
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