Enabling Igmp Proxying; Configuring Multicast Forwarding On A Downstream Interface - HP A5500 SI Switch Series Configuration Manual

Enabling IGMP proxying

You can enable IGMP proxying on the interface in the direction toward the root of the multicast
forwarding tree to make the device serve as an IGMP proxy.
Follow these steps to enable IGMP proxying:
To do...
Enter system view
Enter interface view
Enable the IGMP proxying
feature
NOTE:
Each device can have only one interface serving as the proxy interface. In scenarios with multiple
instances, IGMP proxying is configured on only one interface per instance.
Do not 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.
Do not 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.
A downstream interface that is running IGMPv1 cannot be elected as the DR and cannot serve as the
IGMP querier.
Do not enable IGMP proxying on a VLAN interface with IGMP snooping enabled, or vice versa.

Configuring multicast forwarding on a downstream interface

Only queriers can forward multicast traffic; non-queriers have no multicast forwarding capabilities. This
design helps avoid duplicate multicast flows. It is the same on IGMP proxy devices. Only the
downstream interfaces that act 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.
Follow these steps to enable multicast forwarding on a downstream interface
To do...
Enter system view
Enter interface view
Enable multicast forwarding on a
non-querier downstream interface
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
100
Remarks
—
—
Required
Disabled by default.
Remarks
—
—
Required
Disabled by default.