H3C Technologies H3C SecPath F1000-E - Manual (Page 22)

2
Enabling Reception of Directed Broadcasts to a Directly
Connected Network
If a device is enabled to receive directed broadcasts, the device will determine whether to forward them
according to the configuration on the outgoing interface.
Follow these steps to enable the device to receive directed broadcasts:
To do… Use the command… Remarks
Enter system view system-view —
Enable the device to receive
directed broadcasts
ip forward-broadcast Required
NOTE:
A device that has been disabled from receiving directed broadcasts can still receive broadcast packets
destined for specific UDP ports, which, for example, are configured to be forwarded by UDP helper.
Enabling Forwarding of Directed Broadcasts to a Directly
Connected Network
Follow these steps to enable the device to forward directed broadcasts:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Enable the interface to forward
directed broadcasts ip forward-broadcast [ acl
acl-number ]
Required
By default, the device is disabled
from forwarding directed
broadcasts.
NOTE:
•
If an ACL is referenced in the ip forward-broadcast command, only packets permitted by the ACL can be
forwarded.
• If you repeatedly execute the ip forward-broadcast command on an interface, the last executed
command takes effect only. If the command executed last time does not include the acl
acl-number, the
ACL configured previously will be removed.
Configuration Example
Network requirements
As shown in Figure 1 , the host’s interface and GigabitEthernet 0/1 of Device A are on the same network
segment (1.1.1.0/24). Interface GigabitEthernet 0/2 of Device A and interface GigabitEthernet 0/2 of
Device B are on another network segment (2.2.2.0/24). The default gateway of the host is