Enabling Forwarding Of Directed Broadcasts To A Directly Connected Network; Configuration Example - 3Com 4210G Series Configuration Manual

Enabling Forwarding of Directed Broadcasts to a Directly Connected Network

Follow these steps to enable the device to forward directed broadcasts:
To do...
Enter system view
Enter interface view
Enable the interface to forward
directed broadcasts
If an ACL is referenced in the ip forward-broadcast [ acl-number ] command, only packets
permitted by the ACL can be forwarded.
If you repeatedly execute the ip forward-broadcast acl [ acl-number ] 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
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.
Figure 11-1 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.
[SwitchA] interface vlan-interface 3
Use the command...
system-view
interface interface-type
interface-number
ip forward-broadcast [ acl
acl-number ]
11-1, the host's interface and VLAN-interface 3 of Switch A are on the same
11-2
Remarks
—
—
Required
By default, the device is
disabled from forwarding
directed broadcasts.