Configure Directed Broadcast
A directed broadcast is a frame sent to the subnet broadcast address on a remote IP subnet. When you disable (or suppress) directed broadcasts on an interface, all frames sent to the subnet broadcast address for a local router interface are dropped. Disabling directed broadcasts protects hosts from possible denial-of-service (DOS) attacks. By default, this feature is disabled on the device.
Procedure
Example
Enable directed broadcast on VLAN 2:
Switch:1>enable Switch:1#configure terminal Switch:1(config)#interface vlan 2 Switch:1(config-if)#ip directed-broadcast enable
Display VLAN IDs with directed broadcast enabled:
Switch:1>show ip directed-broadcast vlan Vlan Directed-Broadcast ========================================================================================== VLAN ID DIRECTED-BROADCAST ------------------------------------------------------------------------------------------ 2 true
Variable Definitions
The following table defines parameters for the ip directed-broadcast command.
Variable |
Value |
---|---|
enable |
Enables the device to forward directed broadcast frames to the specified VLAN. The default setting for this feature is disabled. |