H3C Technologies H3C S7500E Series Switches - Manual (Page 63)

4-10
To do... Use the command... Remarks
Enable IGMP leave suppression
onu-protocol igmp-snooping
leave-aggregation enable
Optional
Enabled by default
The max-response-time keyword in the onu-protocol igmp-snooping command sets the maximum
response time of the group-specific queries. If the device receives no response at the first timeout of
the maximum response time, it re-sends group-specific queries. If the device still receives no response
within the maximum response time, the multicast group on the corresponding ONU is deleted.
Multicast control mode
1) OLT-side functions
The OLT side maintains a user multicast service access control table to centrally manage user
multicast service access rights.
The OLT identifies users through user LLIDs and the VLAN tags (consistent with UNI port
numbers) carried in uplink IGMP report messages, and determines whether a user has the right
to access the requested multicast service and, if yes, the related parameters.
The OLT uses extended multicast control OAM packets to send the ONU the user's access right
to the multicast channel, allowing the ONU to forward or shut off the multicast traffic for the user.
The network management system at the OLT side centrally manages the multicast access control.
The OLT governs, while an ONU executes, multicast right management. Meanwhile, the OLT
supports the cooperation between IGMP proxy and upper-layer multicast routers to dynamically
request and deliver multicast traffic.
2) ONU-side functions
The ONU side maintains a table for multicast address filtering and multicast forwarding. It
performs flow control only for the current multicast service on the ONU.
The ONU adds VLAN tags (A UNI port number is used as the VLAN tag. For example, the packets
received on UNI 1 are tagged with VLAN 1.) to the IGMP report messages without VLAN tags to
identify users, and transparently sends the messages to the OLT. Then the ONU adds or deletes
the group address filtering and multicast forwarding entries on the ONU based on the multicast
control OAM packets (containing a series of multicast control entries) delivered by the OLT, and
forwards or shuts off the multicast traffic accordingly.
Follow these steps to configure multicast in multicast control mode:
To do... Use the command... Remarks
Enter system view system-view —
Enter ONU port view interface onu interface-number —