HP 7000 dl Router Series User's Guide download pdf (Page 859)

100

101

SROS Command Line Interface Reference Guide Loopback Interface Configuration Command Set

ip helper-address <address>

Use the ip helper-address command to configure the Secure Router OS to forward User Datagram

Protocol (UDP) broadcast packets received on the interface. Use the no form of this command to disable

forwarding packets.

Syntax Description

<address> Specifies the destination IP address (in dotted decimal notation) for the forwarded

UDP packets.

Default Values

By default, broadcast UDP packets are not forwarded.

Command Modes

(config-interface)# Interface Configuration Mode required (applies to all physical interfaces as well as

virtual interfaces)

Functional Notes

When used in conjunction with the ip forward-protocol command, the ip helper-address feature allows

you to customize which broadcast packets are forwarded.

To implement the helper address feature, assign a helper-address(es) (specifying the device that needs to

receive the broadcast traffic) to the interface closest to the host that transmits the broadcast packets.

When broadcast packets (of the specified type forwarded using the ip forward-protocol command) are

received on the interface, they will be forwarded to the device that needs the information.

Only packets meeting the following criteria are considered eligible by the

helper-address

feature:

1. The packet IP protocol is User Datagram Protocol (UDP).

2. Any UDP port specified using the

ip forward-protocol

command.

3. The media access control (MAC) address of the frame is an all-ones broadcast address (ffff.ffff.ffff).

4. The destination IP address is broadcast defined by all ones (255.255.255.255) or a subnet broadcast (for

example, 192.33.4.251 for the 192.33.4.248/30 subnet).

Note

The ip helper command must be used in conjunction with the ip forward-protocol command

to configure the Secure Router OS to forward UDP broadcast packets.

1 ... 858 859 860 ... 941

HP 7000 dl Router Series User's Guide Page 859

Comments to this Manuals

HP 7000 dl Router Series User's Guide Page 859

Comments to this Manuals

Related products and manuals for Networking HP 7000 dl Router Series