ip forward-protocol udp echo

interface Vlan510
 description P1N_Produzione
 ip address xx.yy.zz
 ip helper-address zz.xx.cc
 ip helper-address ss.dd.ff
 ip directed-broadcast 107
 standby preempt
 standby authentication xxx
 standby 210 ip ee.rr.tt.yy
 standby 210 priority 200
 standby 210 preempt
!

access-list 107 permit udp host zz.xx.cc.vv any eq echo
access-list 107 permit udp host rr.tt.yy.gg any eq echo

[Huawei]acl 3333

[Huawei-acl-adv-3333]rule 5 permit udp source zz.xx.cc.vv 0 destination any destination-port eq echo

[Huawei-acl-adv-3333]rule 10 permit udp source rr.tt.yy.gg 0 destination any destination-port eq echo

[Huawei-Vlanifxx]ip forward-broadcast acl 3333

Here is the link:

http://support.huawei.com/hedex/hdx.do?docid=EDOC1000135317&id=ip_forward-broadcast&text=ip%252520forward-broadcast&lang=en

ip forward-broadcast

Function

Using the ip forward-broadcast command, you can enable an interface to forward directed broadcast packets.

Using the undo ip forward-broadcast command, you can disable an interface from forwarding directed broadcast packets.

By default, disable the interface from forwarding directed broadcast packets.