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Command Reference Guide ATM Sub-Interface Config Command Set
61200510L1-35E Copyright © 2005 ADTRAN 759
ip mcast-stub upstream
Use the ip mcast-stub upstream command to enable multicast forwarding on an interface and place it in
multicast stub upstream mode. Use the no form of this command to disable.
Syntax Description
No subcommands.
Default Values
By default, this command is disabled.
Applicable Platforms
This command applies to the NetVanta 300, 1000R, 3000, and 4000 Series units.
Command History
Release 7.1 Command was introduced.
Release 8.1 ATM sub-interface was added.
Functional Notes
This command is used in IP multicast stub applications in conjunction with the ip mcast-stub
helper-address and ip mcast-stub downstream commands. When enabled, the interface becomes a
candidate to be a helper forwarding interface. If chosen as the best path toward the helper address by the
router's unicast route table, the IGMP host function is dynamically enabled and the interface becomes the
active upstream interface, enabling the router to perform as an IGMP proxy. Though multiple interfaces
may be candidates, no more than one interface will actively serve as the helper forwarding interface. Refer
to
ip mcast-stub helper-address <ip address> on page 434 and ip mcast-stub downstream on page 757 for
more information.
Usage Examples
The following example enables multicast forwarding on the interface:
(config)#interface atm 1.1
(config-atm 1.1)#ip mcast-stub upstream