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15-2
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 15 Configuring IP Multicast
Feature History for IP Multicast
Feature History for IP Multicast
Restrictions for IP Multicast
The IP Multicast feature has the following restrictions:
• Cisco 10000 series router software does not support running Distance Vector Multicast Routing
Protocol (DVMRP) back to back between routers.
• If you enable IP multicast fast switching on one interface, you must enable it on all outbound
interfaces on the router. Failure to do so results in the router sending duplicate multicast packets out
the interface that has fast switching enabled.
• Cisco 10000 series router does not support accounting for Multicast packets on Packet over SONET
(POS) line cards, Gigabit Ethernet subinterfaces, and ATM AAL5 layer type.
• The Cisco 10000 series router does not support fragmentation of multicast traffic.
• The Cisco 10000 series router does not support fragmentation on Multicast Distribution Tree
(MDT). To avoid fragmentation, we recommend that the value of MDT Maximum Transmission
Unit (MTU) is set to a maximum of 64000.
Configuration Tasks for IP Multicast Routing
To configure basic IP multicast routing, perform the following tasks:
• Enabling IP Multicast Routing, page 15-3
• Enabling PIM on an Interface, page 15-3
• Enabling Dense Mode, page 15-3
• Enabling Sparse Mode, page 15-4
• Enabling Sparse-Dense Mode, page 15-4
• Configuring Native Multicast Load Splitting, page 15-4
• Configuring the Control Plane Protocol Policy, page 15-4
For information on other optional basic and advanced tasks, see the “IP Multicast” chapter in the
Cisco
IOS IP Configuration Guide, Release 12.2.
Cisco IOS Release Description Required PRE
12.2(4)BZ1 This feature was introduced on the Cisco 10000 series
router.
PRE1
12.3(7)XI1 This feature was integrated into Cisco IOS Release 12.3(7)
XI1.
PRE2
12.2(28)SB This feature was integrated into Cisco IOS Release
12.2(28)SB.
PRE2