User's Manual

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75.2.5 Configuring Candidate RP
Configure the candidate RP to enable it to be sent to the BSR periodically and then be diffused to
all PIM-SM routers in the domain, ensuring the RP mapping is unique.
Run the following command in global configuration mode:
Command Purpose
ip pim-sm rp-candidate
[
type
number] [
interval
|group-list acl-name]
no ip pim-sm rp-candidate
[
type
number]
Configures the local switch as the candidate
RP. After the candidate RP is configured, it
will be sent to the BSR periodically. The BSR
then broadcasts all PIM-SM routers in the
PIM-SM domain.
75.2.6 Configuring Candidate BSR
The configuration of the candidate RP can generate the unique global BSR in the PIM-SM domain. The global
BSR collects and distributes the RP in the domain, ensuring the RP mapping is unique.
Run the following command in global configuration mode:
Command Purpose
ip pim-sm bsr-candidate
type number
[hash-mask-length] [
priority
]
no ip pim-sm bsr-candidate
type number
Configures the local switch as the candidate
BSR, and competes the global BSR by
learning the BSM message.
75.2.7 Configuring SPT-threshhold
When the data is forwarded on the switch, it needs to judge whether shift RPT to SPT. The
evidence for this judge is spt-threshold. By default SPT switches if the receiver receives the first data
packet. We can set the threshold of RPT switching to SPT; unit: KB/s. In general if RPT switches to
SPT, there is no return.
switch_config#router pim-sm
switch_config_ps#spt-threshold 1000
75.2.8 Configuring SSM
SSM model needs support of IGMPv3 and enables IGMPv3 on the PIM-SM device of the receiver.
SSM model can be realized by the subset function of pim-sm and the system enables functions of PIM-
SM and SSM. When deploying pim-sm, it is recommend to enable pim-sm on all non-boundary
interfaces.
During the process of transmitting the information of multicast source to the receiver, whether pim-
ssm or pim-sm is determined by whether the multicast group of the receiver prescribed channel (S, G)
exists within the multicast group of pim-ssm. Interfaces which enables pim-sm will deem the multicast
group within the range adopting the model “pim-ssm”.
Before configuring the basic functions of pim-ssm, the unicast route needs to be configured first,
which ensures the interaction of the inner network layer and available route.
Steps for configuring pim-ssm: