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Configuring IP Multicast Routing
Advanced PIM Features Configuration Task List
IPC-427
Cisco IOS IP Configuration Guide
Limiting the Rate of PIM Register Messages
To set a limit on the maximum number of PIM-SM register messages sent per second for each (S, G)
routing entry, use the following global configuration command on the DR:
Dataless register messages are sent at a rate of 1 message per second. Continuous high rates of register
messages may occur if a DR is registering bursty sources (sources with high data rates) and if the RP is
not running PIM Version 2.
By default, this command is not configured and register messages are sent without limiting their rate.
Enabling this command will limit the load on the DR and RP at the expense of dropping those register
messages that exceed the set limit. Receivers may experience data packet loss within the first second in
which packets are sent from bursty sources.
Configuring the IP Source Address of Register Messages
Register messages are unicast messages sent by the DR to the RP router when a multicast packet needs
to be sent on a rendezvous point tree (RPT). By default, the IP source address of the register message is
set to the address of the outgoing interface of the DR leading toward the RP. To configure the IP source
address of a register message to an interface address other than the outgoing interface address of the DR
leading toward the RP, use the following command in global configuration mode:
Enabling Proxy Registering
In a PIM-SM domain, receivers know about sources because the DR connected to the source registers
the source with the RP. By default, a DR will only register sources that are connected to it or that are
forwarded to the DR from a DVMRP router.
For a router in a PIM-SM domain configured to operate in sparse mode or sparse-dense mode, the ip pim
dense-mode proxy-register interface configuration command must be configured on the interface
leading toward the bordering dense mode region. This configuration will enable the router to register
traffic from the dense mode region with the RP in the sparse mode domain.
To enable proxy registering, use the following command in interface configuration mode:
Command Purpose
Router(config)# ip pim register-rate-limit rate
Sets a limit on the maximum number of PIM-SM register
messages sent per second for each (S, G) routing entry.
Command Purpose
Router(config)# ip pim register-source type number
Configures the IP source address of a register message.
Command Purpose
Router(config-if)# ip pim dense-mode
[proxy-register {list access-list | route-map
map-name}]
Enables proxy registering on the interface of a DR (leading
toward the bordering dense mode region) for multicast traffic
from sources not connected to the DR.