H3C Technologies H3C S7500E Series Switches - Manual (Page 62)

4-9
Configuring IGMP membership report suppression
When an ONU receives an IGMP membership report from a multicast group member, the ONU
forwards the message to the OLT. Thus, when multiple members of a multicast group are attached to
the ONU, the OLT will receive duplicate IGMP reports from these members.
With the IGMP report suppression function enabled, within each query cycle, the ONU forwards only
the first IGMP report of a multicast group to the OLT and will not forward the subsequent IGMP reports
from the same multicast group to the OLT. This helps to reduce the number of packets being
transmitted over the network.
Follow these steps to configure multicast in IGMP snooping mode:
To do... Use the command... Remarks
Enter system view system-view —
Enter ONU port view interface onu interface-number —
Configure the multicast mode of
the ONU as IGMP snooping
multicast-mode igmp-snooping
Optional
By default, the multicast mode of
the ONU is IGMP Snooping.
Add a UNI to the specified
multicast VLAN(s)
uni uni-number multicast vlan
{ vlan-id } & <1-50>
Required
Configure the number of multicast
channels on the specified UNI
uni uni-number
multicast-group-number number
Optional
By default, the users connected to
a UNI can access 64 multicast
channels at the same time.
Remove the VLAN tag of the
downlink multicast flow on the UNI
port
uni uni-number
multicast-strip-tag enable
Optional
By default, a UNI does not remove
the VLAN tag of the downlink
multicast flow.
Configure the aging timer of the
router port
onu-protocol igmp-snooping
router-aging-time seconds
Optional
105 seconds by default
Configure the query-response
timer
onu-protocol igmp-snooping
max-response-time seconds
Optional
By default, the maximum response
time of group-specific queries is 1
second.
Configure the aging timer of the
multicast member port
onu-protocol igmp-snooping
host-aging-time seconds
Optional
260 seconds by default
Enable IGMP membership report
suppression
onu-protocol igmp-snooping
report-aggregation enable
Optional
Disabled by default