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Command Reference Guide
ip mcast-stub downstream
Use the ip mcast-stub downstream command to enable multicast forwarding and Internet Group
Management Protocol (IGMP) (router mode) on an interface, and to place it in multicast stub downstream
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 7.1
Release A4.01
Functional Notes
This command is used in IP multicast stub applications in conjunction with the ip mcast-stub
helper-address and 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 (DR) and ensure proper forwarding.
Refer to
ip mcast-stub helper-address <ip address> on page 1042
1821
for more information.
Usage Examples
The following example enables multicast forwarding and IGMP on the MEF Ethernet interface:
(config)#interface mef-ethernet 0/1
(config-mef-ethernet 0/1)#ip mcast-stub downstream
60000CRG0-35E
Command was introduced.
Command was expanded to include the Metro Ethernet Forum (MEF)
Ethernet interface.
Copyright © 2012 ADTRAN, Inc.
MEF Ethernet Interface
and
ip mcast-stub upstream on page
1818
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