Hub/Switch Reference Guide

84 VLAN Commands
NN47250-100 (Version 02.51)
clear fdb
Deletes an entry from the forwarding database (FDB).
Syntax clear fdb {perm | static | dynamic | port port-list} [vlan vlan-id] [tag tag-value]
Defaults None.
Access Enabled.
Usage You can delete forwarding database entries based on entry type, port, or VLAN. A VLAN name or
number is required for deleting permanent or static entries.
Examples The following command clears all static forwarding database entries that match VLAN blue:
WSS# clear fdb static vlan blue
success: change accepted.
The following command clears all dynamic forwarding database entries that match all VLANs:
WSS# clear fdb dynamic
success: change accepted.
The following command clears all dynamic forwarding database entries that match ports 3 and 5:
WSS# clear fdb port 3,5
success: change accepted.
See Also
• set fdb on page 77
• show fdb on page 81
perm Clears permanent entries. A permanent entry does not age out and
remains in the database even after a reboot, reset, or power cycle. You
must specify a VLAN name or number with this option.
static Clears static entries. A static entry does not age out, but is removed from
the database after a reboot, reset, or power cycle. You must specify a
VLAN name or number with this option.
dynamic Clears dynamic entries. A dynamic entry is automatically removed
through aging or after a reboot, reset, or power cycle. You are not required
to specify a VLAN name or number with this option.
port port-list Clears dynamic entries that match destination ports in the port list. You
are not required to specify a VLAN name or number with this option.
vlan vlan-id VLAN name or number—required for removing permanent and static
entries. For dynamic entries, specifying a VLAN removes entries that
match only that VLAN. Otherwise, dynamic entries that match all
VLANs are removed.
tag tag-value VLAN tag value that identifies a virtual port. If you do not specify a tag
value, WSS Software deletes only entries that match untagged interfaces.
Specifying a tag value deletes entries that match only the specified tagged
interface.