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Operation Manual – Multicast Protocol
Quidway S5600 Series Ethernet Switches-Release 1510
Chapter 7 PIM Configuration
Huawei Technologies Proprietary
7-10
VI. Switching RPT to SPT
When the multicast router nearest to the receiver detects that the rate of the multicast
packet from RP to the multicast group G exceeds the threshold value, it will send (S, G)
join messages to the upper-layer router of the multicast source S. The join message
reaches the router nearest to the multicast source (namely, the first hop router) hop by
hop and all the passed routers have the (S, G) entry. As a result, a branch of SPT is
built.
Then, the last hop router sends Prune message with the RP bit to RP hop by hop.
When RP receives the message, it will reversely forward the Prune message to the
multicast source. Thus, the multicast information stream is switched from RPT to SPT.
After the switch from RPT to SPT, the multicast information will be sent from the
multicast source S to the receiver directly. Through the switching from RPT to SPT,
PIM-SM can build SPT in a more economical way than PIM-DM.
The related threshold values are not set on S5600 series Ethernet switches. When the
switch receives multicast data forwarded along RPT, it will update the input interface
automatically and sends Prune messages to RP.
7.2 Common PIM Configuration
You can configure the PIM feature of the switch in interface view. The configuration
includes:
Table 7-1
Configuration tasks
Operation
Description
Related section
Enable PIM-DM
(PIM-SM) on the interface
Required
Section 7.2.1 Enabling PIM-DM
(PIM-SM) on the Interface
Configure the interval of
sending Hello packets
Optional
Section 7.2.2 Configuring the
interval of sending Hello packets
Configure PIM neighbors
Optional
Section 7.2.3 Configuring PIM
Neighbors
Clear the related PIM
entries
Optional
Section 7.2.4 Clearing the Related
PIM Entries
7.2.1 Enabling PIM-DM (PIM-SM) on the Interface
Table 7-2
Enable PIM-DM (PIM-SM) on the interface
Operation
Command
Description
Enter system view
system
-
view
—
Enable the multicast
routing protocol
multicast
routing-enable
Required