HP ProCurve 7102dl Reference Manual page 425

Secure router sros command line interface

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SROS Command Line Interface Reference Guide

Global Configuration Mode Command Set

ip mcast-stub helper-address <ip address>

Use the ip mcast-stub helper-address command to specify an IP address toward which IGMP host reports

and leave messages are forwarded. This command is used in IP multicast stub applications in conjunction

with the ip mcast-stub downstream and ip mcast-stub upstream commands. Use the no form of this

command to return to default.

Syntax Description

IGMP host reports and leave messages are forwarded toward this address.

Default Values

By default, no helper-address is configured.

Functional Notes

Helper-address is configured globally and applies to all multicast-stub downstream interfaces. The address

specified may be the next upstream hop or any upstream address on the distribution tree for the multicast

source, up to and including the multicast source. The router selects, from the list of multicast-stub upstream

interfaces, the interface on the shortest path to the specified address. The router then proxies, on the se-

lected upstream interface (using an IGMP host function), any host joins/leaves received on the downstream

interface(s). The router retransmits these reports with addresses set as if the report originated from the se-

lected upstream interface.

For example, if the router receives multiple joins for a group, it will not send any extra joins out the

upstream interface. Also, if it receives a leave, it will not send a leave until it is certain that there are no

more subscribers on any downstream interface.

Usage Examples

The following example specifies 172.45.6.99 as the helper-address:

ProCurve(config)#ip mcast-stub helper-address 172.45.6.99

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