Configuring Multicast Forwarding On A Downstream Interface - HP A6600 Configuration Manual

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Each router can have only one interface serving as the proxy interface. In scenarios with multiple
instances, configure IGMP proxying on only one interface per instance.
You cannot enable IGMP on an interface with IGMP proxying enabled. Moreover, only the igmp
require-router-alert, igmp send-router-alert, and igmp version commands can take effect on such an
interface.
You cannot enable other multicast routing protocols (such as PIM-DM or PIM-SM) on an interface with
IGMP proxying enabled, or vice versa. However, the source-lifetime, source-policy, and ssm-policy
commands configured in PIM view can still take effect. In addition, in IGMPv1, the designated router (DR)
is elected by the working multicast routing protocol (such as PIM) to serve as the IGMP querier. Therefore,
a downstream interface running IGMPv1 cannot be elected as the DR and thus cannot serve as the IGMP
querier.
You cannot enable IGMP proxying on a VLAN interface with IGMP snooping enabled, or vice versa.
To do...
1.
Enter system view.
2.
Enter interface view.
3.
Enable the IGMP
proxying feature.

Configuring multicast forwarding on a downstream interface

Only queriers can forward multicast traffic but non-queriers have no multicast forwarding capabilities, to
avoid duplicate multicast flows. It is the same on IGMP proxy devices. Only the downstream interfaces
acting as a querier can forward multicast traffic to downstream hosts.
However, when a downstream interface of a proxy device fails to win the querier election, you must
enable multicast forwarding on this interface.
To do...
1.
Enter system view.
2.
Enter interface view.
3.
Enable multicast forwarding on a
non-querier downstream
interface.
On a multi-access network with more than one IGMP proxy device, you cannot enable multicast
forwarding on any other non-querier downstream interface after one of the downstream interfaces of
these IGMP proxy devices has been elected as the querier. Otherwise, duplicate multicast flows might be
received on the multi-access network.
Use the command...
system-view
interface interface-type interface-number
igmp proxying enable
Use the command...
system-view
interface interface-type
interface-number
igmp proxying forwarding
80
Remarks
Required.
Disabled by default.
Remarks
Required.
Disabled by default.

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