128 CHAPTER 13: IP PERFORMANCE CONFIGURATION
Enabling Forwarding of
Directed Broadcasts to a
Directly Connected
Network
Follow these steps to enable the device to forward directed broadcasts:
n
■ You can reference an ACL to forward only directed broadcasts permitted by the
ACL.
■ If you execute the ip forward-broadcast acl command on an interface
repeatedly, the last execution overwrites the previous one. 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 38, the host’s interface and VLAN-interface 3 of Switch A are
on the same network segment (1.1.1.0/24). VLAN-interface 2 of Switch A and
VLAN-interface 2 of Switch B are on another network segment (2.2.2.0/24). The
default gateway of the host is VLAN-interface 3 (IP address 1.1.1.2/24) of Switch
A. Configure a static route on Switch B to enable the reachability between host
and Switch B.
Network diagram
Figure 38 Network diagram for receiving and forwarding directed broadcasts
Configuration procedure
■ Configure Switch A
# Enable Switch A to receive directed broadcasts.
<SwitchA> system-view
[SwitchA] ip forward-broadcast
# Configure IP addresses for VLAN-interface 3 and VLAN-interface 2.
To do… Use the command… Remarks
Enter system view system-view -
Enable the device to receive
directed broadcasts
ip forward-broadcast Required
By default, the device is
disabled from receiving
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.
1.1.1.1/24
Vlan-int3
1.1.1.2/24
Vlan-int2
2.2.2.2/24
Vlan-int2
2.2.2.1/24
Switch A Switch BHost
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