UMN:CLI
User Manual
V8102
536
Command
Mode
Description
ip pim register-source
{
A.B.C.D
|
INTERFACE
}
Global
Specifies the source IP address of register messages.
A.B.C.D: source IP address
INTERFACE: interface name
no ip pim register-source
Deletes a specified source IP address of register mes-
sages.
10.3.3.4
SPT Switchover
PIM-SM provides the switching option to deliver multicast traffic on the SPT. Multicasting
over the SPT may be more efficient than multicasting over the RPT, since it can substan-
tially reduce the network latency.
When the switching option is enabled, once multicast traffic from sources arrives at the
DR, the switchover to the SPT then occurs. This option only provides the binary option,
meaning that the switching to the SPT occurs either when receiving the first multicast
packet, or not at all; it is not rate-based. You can enable this option only for specified mul-
ticast groups using access lists.
To enable the switchover to the SPT, use the following command.
Command
Mode
Description
ip pim spt-threshold
Global
Enables the switchover to SPT.
ip pim spt-threshold group-list
{<1-99> | <1300-1999> |
WORD
}
Enables the switchover to SPT for specified multicast
groups.
1-99: IP standard access list
1300-1999: IP standard access list (extended range)
WORD: access list name
To disable the switchover to the SPT, use the following command.
Command
Mode
Description
no ip pim spt-threshold
Global
Disables the switchover to SPT.
no ip pim spt-threshold group-
list
{<1-99> | <1300-1999> |
WORD
}
The switchover to the SPT to deliver multicast traffic is disabled by default.
10.3.3.5
Cisco
’s Router Interoperability
Register Message Checksum
When a multicast source registers with the RP, the DR encapsulates the multicast traffic
from the source in the PIM register message, and unicasts it to the RP. The standard PIM
protocol specifies that the checksum field in the register message contains the checksum
for the entire register message excluding the data portion, the encapsulated multicast traf-
fic.
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