H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches Chapter 5 PIM Configuration
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 Note:
z The commands introduced in this section are to be configured on C-RPs.
z For the configuration of other timers in PIM-SM, refer to Configuring PIM Common
Timers
.
5.3.6 Configuring PIM-SM Register Messages
Within a PIM-SM domain, the source-side DR sends register messages to the RP, and
these register messages have different multicast source or group addresses. You can
configure a filtering rule to filter register messages so that the RP can serve specific
multicast groups. If an (S, G) entry is denied by the filtering rule, or the action for this
entry is not defined in the filtering rule, the RP will send a register-stop message to the
DR to stop the registration process for the multicast data.
In view of information integrity of register messages in the transmission process, you
can configure the device to calculate the checksum based on the entire register
messages. However, to reduce the workload of encapsulating data in register
messages and for the sake of interoperability, this method of checksum calculation is
not recommended.
When receivers stop receiving multicast data addressed to a certain multicast group
through the RP (that is, the RP stops serving the receivers of a specific multicast group),
or when the RP formally starts receiving multicast data from the multicast source, the
RP sends a register-stop message to the source-side DR. Upon receiving this message,
the DR stops sending register messages encapsulated with multicast data and enters
the register suppression state.
In a probe suppression cycle, the DR can send a null register message (a register
message without multicast data encapsulated), a certain length of time defined by the
probe time before the register suppression timer expires, to the RP to indicate that the
multicast source is active. When the register suppression timer expires, the DR starts
sending register messages again. A smaller register suppression timeout setting will
cause the RP to receive bursting multicast data more frequently, while a larger timeout
setting will result in a larger delay for new receivers to join the multicast group they are
interested in.
Follow these steps to configure PIM-SM register-related parameters:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter PIM view
pim
—