H3C S5500-EI User Manual

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Configuring multicast forwarding on a downstream interface
Only queriers can forward multicast traffic but non-queriers have no multicast forwarding capabilities.
This design helps avoid duplicate multicast flows. It is the same on IGMP proxy switches. Only the
downstream interfaces acting as a querier can forward multicast traffic to downstream hosts.
However, when a downstream interface of a proxy switch fails to win the querier election, you must
enable multicast forwarding on this interface.
On a multi-access network with more than one IGMP proxy switch, you cannot enable multicast
forwarding on any other non-querier downstream interface after one of the downstream interfaces of
these IGMP proxy switches 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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable multicast forwarding on
a non-querier downstream
interface.
igmp proxying forwarding Disabled by default
Displaying and maintaining IGMP
CAUTION:
The reset igmp group command might cause multicast data transmission failures.
To display and maintain IGMP:
Task Command
Display IGMP group information.
display igmp [ all-instance |
vpn-instance vpn-instance-name ]
group [ group-address | interface
interface-type interface-number ]
[ static | verbose ] [ | { begin |
exclude | include }
regular-expression ]
Available in any view.
Display the Layer 2 port
information of IGMP groups.
display igmp group port-info [ vlan
vlan-id ] [ slot slot-number ]
[ verbose ] [ | { begin | exclude |
include } regular-expression ]
Available in any view.

H3C S5500-EI Specifications

General

Brand	H3C
Model	S5500-EI
Category	Switch
Language	English