Netgear XCM8810 - 8800 SERIES 10-SLOT CHASSIS SWITCH ユーザーズマニュアル

power off/on cycle occurs. A static entry is maintained exactly as it was created. Conditions 
that cause dynamic entries to be updated, such as VLAN or port configuration changes, do 
not affect static entries.

To create a permanent static FDB entry, see 

on page 274.

A locked static entry is an entry that was originally learned dynamically, but has been made 
static (locked) using the MAC address lock-down feature. It is identified by the “s,” “p,” and “l” 
flags in 

show fdb

 command output and can be deleted using the 

delete fdbentry [all | 

<mac_address> [vlan <vlan name>]

 command. See 

on page 439 for 

more information about MAC address lock-down. 

A blackhole entry configures the switch to discard packets with a specified MAC destination 
address. Blackhole entries are useful as a security measure or in special circumstances 
where a specific source or destination address must be discarded. Blackhole entries can be 
created through the CLI, or they can be created by the switch when a port’s learning limit has 
been exceeded.

Blackhole entries are treated like permanent entries in the event of a switch reset or power 
off/on cycle. Blackhole entries are never aged out of the database.

A Private VLAN (PVLAN) creates special FDB entries that are described in 

Managing the FDB

This section describes the following topics:

Adding a Permanent Static Entry

To add a static entry, use the following command:

create fdbentry <mac_addr> vlan <vlan_name> [ports <port_list> | blackhole]

The following example adds a permanent static entry to the FDB: