Configuring Igmp Proxying; Configuration Prerequisites; Enabling Igmp Proxying; Configuring Multicast Forwarding On A Downstream Interface - HP 4800G Series Configuration Manual

Configuring IGMP Proxying

Configuration Prerequisites

Before configuring the IGMP proxying feature, complete the following tasks:
Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer.
Enable IP multicast routing.

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
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.
You cannot enable IGMP on interfaces with IGMP proxying enabled. Moreover, only the igmp
require-router-alert, igmp send-router-alert, and igmp version commands can take effect on
such interfaces.
You cannot enable other multicast routing protocols (such as PIM-DM or PIM-SM ) on interfaces
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.

Configuring Multicast Forwarding on a Downstream Interface

Typically, only queriers are able to forward multicast traffic while 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 need to
enable multicast forwarding on this interface.
Use the command...
system-view
interface interface-type
interface-number
igmp proxying enable
1-17
Remarks
—
—
Required
Disabled by default.