Ip Helper-Address - Allied Telesis SwitchBlade x908 Series Software Reference Manual

IP Addressing and Protocol Commands

ip helper-address

ip helper-address Command
This command adds a forwarding destination address for IP Helper to enable forwarding of
User Datagram Protocol (UDP) broadcasts on an interface.
Use the no form of this command to disable the forwarding od broadcast packets to specific
addresses.
Syntax
ip helper-address <ip-address>
no ip helper-address <ip-address>
Parameter
<ip-address>
The destination address for the ip helper-address command is not configured by default.
Default
Interface mode
Mode
Combined with the ip forward-protocol udp command in global configuration mode, the
Usage
ip helper-address command in interface mode allows control of which protocols
(destination port numbers) are forwarded. The ip forward-protocol udp command
configures protocols for forwarding, and the ip helper-address command configures the
destination address(es).
The destination address can be a unicast address or a subnet broadcast address. The UDP
destination port is configured separately with the ip forward-protocol udp command. If
multiple destination addresses are registered then UDP packets are forwarded to each IP
address added to an IP Helper. Up to 32 destination addresses may be added using IP Helper.
Note:
The following example defines IPv4 address 192.168.1.100 as an IP Helper destination
Examples
address to which to forward UDP broadcasts received on vlan2:
awplus(config-if)#
The following example removes IPv4 address 192.168.1.100 as an IP Helper destination
address to which to forward UDP broadcasts received on vlan2:
show running-config
Validation
Commands
ip forward-protocol udp
Related Commands
ip directed-broadcast
23.16
New vs_531 %flag
Description
Forwarding destination address for IP Helper in the format A.B.C.D
The types of UDP broadcast packets that the switch will forward are ONLY those
specified by the ip forward-protocol command(s). There are not other UDP packet
types that the IP helper process forwards by default.
awplus# configure terminal
awplus(config)# interface vlan2
ip helper-address 192.168.1.100
awplus#
awplus(config)#
awplus(config-if)#
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
IP Addressing and Protocol Commands This command adds a forwarding destination address for IP Helper to enable forwarding of User Datagram Protocol (UDP) broadcasts on an interface.
configure terminal
interface vlan2
no ip helper-address 192.168.1.100
C613-50007-01 REV B