R3166-R3206-HP High-End Firewalls Network Management Configuration Guide-6PW101

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To do… Use the command… Remarks
Configure an IGMP SSM
mapping
ssm-mapping group-address { mask |
mask-length } source-address
Required
No IGMP mappings are
configured by default.
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… Use the command…
Remarks
Enter system view system-view —
Enter interface view interface interface-type interface-number —
Enable the IGMP proxying
feature
igmp proxying enable
Required
Disabled by default.
NOTE:
• Each device can have only one interface serving as the proxy interface.
• 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 runnin
g
IGMPv1 cannot be elected as the DR and thus cannot serve
as the IGMP querier.
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.
Follow these steps to enable multicast forwarding on a downstream interface