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Command Reference Guide
HDLC Interface Command Set
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 this feature.
Syntax Description
No subcommands.
Default Values
By default, this command is disabled.
Command History
Release 9.1
Command was introduced.
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 Internet Group Management Protocol (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 1042
and
ip mcast-stub downstream on page 2351
for more information.
Usage Examples
The following example enables multicast forwarding on the high level data link control (HDLC) interface:
(config)#interface hdlc 1
(config-hdlc 1)#ip mcast-stub upstream
60000CRG0-35E
Copyright © 2012 ADTRAN, Inc.
2354
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