HP 7000 dl Router Ip mcast-stub helper-address ip address, Config#ip mcast-stub helper-address

SROS Command Line Interface Reference Guide Global Configuration Mode Command Set

ip mcast-stub helper-address <ip address>

Use the ip mcast-stubhelper-addresscommand 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

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

Default Values

By default, no helper-address is configured.

Command Modes

(config)# Global Configuration Mode required

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:

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

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