HP 7000 dl Router manual Copyright 2005 Hewlett-Packard Development Company, L.P 791

Command Reference Guide Tunnel Configuration Command Set

ip mcast-stub downstream

Use the ip mcast-stub downstream command to enable multicast forwarding and IGMP (router mode) on an interface and place it in multicast stub downstream mode. 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-stubhelper-addressand ip mcast-stub upstream commands. Downstream interfaces connect to segments with multicast hosts. Multiple interfaces may be configured in downstream mode; however, interfaces connecting to the multicast network (upstream) should not be configured in downstream mode. Interfaces configured as downstream should have the lowest IP address of all IGMP-capable routers on the connected segment in order to be selected as the designated router and ensure proper forwarding. Refer to ip mcast-stubhelper-address <ip address> on page 389 and ip mcast-stub upstream on page 794 for more information.

Usage Examples

The following example enables multicast forwarding and IGMP on the interface:

config)#interface tunnel 1

(config-tunnel 1)#ip mcast-stub downstream

5991-2114 © Copyright 2005 Hewlett-Packard Development Company, L.P. 791