QTECH QSW-8300 Инструкция по настройке - Manual (Page 267)

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When multicast source S sends a multicast packet to multicast group G, the PIM-SM multicast
router directly connected to it will take charge of sealing the multicast packet into registered
message and unicast it to corresponding RP. If there are more than one PIM-SM multicast
routers on a network segment, then DR (Designated Router) takes charge of forwarding the
multicast packet.
(3) SPT Switch
Once the multicast router finds that the rate of the multicast packet from RP with destination
address G exceeds threshold, the multicast router will send Join message to the upper lever
nodes in the source direction, which results in the switch from RPT to SPT.
2. Preparation before PIM-SM configuration
(1) Configuration Candidate RP
More than one RPs (candidate RP) are permitted in PIM-SM network and each C-RP
(Candidate RP) takes charge of forwarding multicast packets with destination address in a
certain range. To configure more than one candidate RPs can achieve RP load balancing.
There is no master or slave difference among RPs. All multicast routers work out the RP
corresponded with certain multicast group based on the same algorithm after receiving the
candidate RP message announced by BSR.
Note that one RP can serve more than one multicast groups, even all multicast groups. But
each multicast group can only correspond with one unique RP at any moment. It can’t
correspond with more RPs at the same time.
(2) BSR Configuration
As the management core of PIMSM network, BSR is in charge of collecting messages sent by
candidate RPs and broadcast them..
There may be only one BSR within a network. However, there may be several candidate BSRs
to be configured. With such arrangement, once a BSR fails, another may be switched to. C-
BSR determines BSR through automatic selection.
29.2.2 PIM-SM6 Configuration Task List
Enable PIM-SM (Required)
Configure static multicast routing entries (Optional)
Configure additional parameters for PIM-SM (Optional)
Configure parameters for PIM-SM interfaces
Configure the interval for PIM-SM hello messages
Configure the holdtime for PIM-SM hello messages
Configure ACL for PIM-SM6 neighbors
Configure the interface as the boundary interface of the PIM-SM6 protocol
Configure the interface as the management boundary of the PIM-SM6 protocol
Configure global PIM-SM parameters