3Com Switch 8800 Advanced Software V5 Configuration Guide

236 CHAPTER 24: IP PERFORMANCE CONFIGURATION
Enabling Forwarding of
Directed Broadcasts to a
Directly Connected
Network (in System
View)
Follow these steps to enable the device to forward directed broadcasts:
Enabling Forwarding of
Directed Broadcasts to a
Directly Connected
Network (in Interface
View)
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 69, the host’s interface and Vlan-interface3 of Switch A are on
the same network segment (1.1.1.0/24). Vlan-interface2 of Switch A and
Vlan-interface2 of Switch B are on another network segment (2.2.2.0/24). The
default gateway of the host is Vlan-interface3 (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 69 Figure 25-1 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
To do... Use the command... Remarks
Enter system view system-view -
Enable the device to
forward directed
broadcasts
ip forward-broadcast Required
By default, the device is
disabled from forwarding
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