Configuration Prerequisites; Enabling Igmp Proxying; Configuring Multicast Forwarding On A Downstream Interface - HP MSR ASM Configuration Manual

Configuration prerequisites

Before you configure 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.
Configuration guidelines
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 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.
Configuration procedure
To enable IGMP proxying:
Step
1. Enter system view.
2. Enter interface view.
3. Enable the IGMP
proxying feature.

Configuring multicast forwarding on a downstream interface

Typically, to avoid duplicate multicast flows, only queriers can forward multicast traffic. On IGMP proxy
devices, a downstream interface must be a querier in order to forward multicast traffic to downstream
hosts. If the interface has failed in the querier election, you must manually enable multicast forwarding on
this 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.
To enable multicast forwarding on a downstream interface
Command
system-view
interface interface-type interface-number
igmp proxying enable
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Remarks
N/A
N/A
Disabled by default.