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Configuration Tasks for IP Multicast Routing
Enabling Sparse Mode
To configure PIM on an interface to be in sparse mode, enter the following command in interface
configuration mode:
Command
Router(config-if)# ip pim sparse-mode
Enabling Sparse-Dense Mode
When you enable sparse-dense mode, the interface is treated as dense mode if the group is in dense
mode. If the group is in sparse mode, the interface is treated in sparse mode. You must have a rendezvous
point (RP) if the interface is in sparse-dense mode and you want to treat the group as a sparse group. For
more information, see the "IP Multicast" chapter in the Cisco IOS IP Configuration Guide, Release 12.2.
To enable PIM to operate in the same mode as the group, enter the following command in interface
configuration mode:
Command
Router(config-if)# ip pim sparse-dense-mode
Configuring Native Multicast Load Splitting
You can configure multicast traffic from different sources to be load split across equal cost paths to take
advantage of multiple paths through the network.
For more information about configuring native multicast load splitting, see the configuration document,
located at the following URL:
http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_load_splt_ecmp_ps6350_TSD_
Products_Configuration_Guide_Chapter.html
A caveat exists for Cisco 10000 series routers; you should not configure native multicast load splitting
Note
for PE devices running EIBGP, as this can result in a loss of traffic.
Configuring the Control Plane Protocol Policy
The SPT-bit is set when the receiver sucessfully builds the shortest path tree (SPT) towards the source
and starts receiving packets on this path, but before that, the packets are sent along the rendezvous point
tree (RPT). Setting up the SPT is accomplished by the control plane protocol (CoPP) in the rendezvous
point (RP). An RP acts as the meeting place for sources and receivers of multicast data. In a PIM-SM
network, sources must send their traffic to the RP. An RP is required only in networks running Protocol
Independent Multicast sparse mode (PIM-SM).
To configure the CoPP policy in the Cisco 10000 series router, use the following commands:
Cisco 10000 Series Router Software Configuration Guide
15-36
Purpose
Enables sparse mode PIM on the interface.
Purpose
Enables PIM to operate in sparse or dense mode, depending on the
multicast group.
Chapter 15
Configuring IP Multicast
OL-2226-23
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Troubleshooting
