Command Reference Guide

Command Reference Guide Tunnel Configuration Command Set

ip mcast-stub helper-enable

Use the ip mcast-stub helper-enable command to assign the ip mcast-stub helper-address as the IGMP

proxy. Use the no form of this command to disable.

Syntax Description

No subcommands.

Default Values

By default, this command is disabled.

Command Modes

(config-interface)# Interface Configuration Mode

Valid interfaces include: Ethernet (eth 0/1), PPP virtual interfaces (ppp 1), HDLC

virtual interfaces (hdlc 1), Frame Relay virtual sub-interfaces (fr 1.20), tunnel

interfaces (tunnel 1), and VLAN interface (vlan 1).

Functional Notes

This command is used in IP multicast stub applications in conjunction with the ip mcast-stub

helper-address, ip mcast-stub upstream, and ip mcast-stub downstream commands. When enabled,

the interface becomes a helper forwarding interface. The IGMP host function is dynamically enabled and

the interface becomes the active upstream interface, enabling the unit to perform as an IGMP proxy. Refer

ip mcast-stub helper-address <ip address> on page 389, ip mcast-stub downstream on page 791, and

ip mcast-stub upstream on page 794 for more information.

Usage Examples

The following example sets the helper address as the IGMP proxy:

(config)#interface tunnel 1

(config-tunnel 1)#ip mcast-stub helper-enable