Cisco WS-C3560G-24PS-E Software Configuration Guide - Page 706
Configuring Basic Multicast Routing
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Configuring IP Multicast Routing Chapter 32 Configuring IP Multicast Routing Configuring Basic Multicast Routing You must enable IP multicast routing and configure the PIM version and the PIM mode. Then the software can forward multicast packets, and the switch can populate its multicast routing table. You can configure an interface to be in PIM dense mode, sparse mode, or sparse-dense mode. The switch populates its multicast routing table and forwards multicast packets it receives from its directly connected LANs according to the mode setting. You must enable PIM in one of these modes for an interface to perform IP multicast routing. Enabling PIM on an interface also enables IGMP operation on that interface. In populating the multicast routing table, dense-mode interfaces are always added to the table. Sparse-mode interfaces are added to the table only when periodic join messages are received from downstream devices or when there is a directly connected member on the interface. When forwarding from a LAN, sparse-mode operation occurs if there is an RP known for the group. If so, the packets are encapsulated and sent toward the RP. When no RP is known, the packet is flooded in a dense-mode fashion. If the multicast traffic from a specific source is sufficient, the receiver's first-hop router might send join messages toward the source to build a source-based distribution tree. By default, multicast routing is disabled, and there is no default mode setting. This procedure is required. Beginning in privileged EXEC mode, follow these steps to enable IP multicasting, to configure a PIM version, and to configure a PIM mode. This procedure is required. Step 1 Step 2 Step 3 Command configure terminal ip multicast-routing distributed interface interface-id Step 4 ip pim version [1 | 2] Purpose Enter global configuration mode. Enable IP multicast distributed switching. Specify the Layer 3 interface on which you want to enable multicast routing, and enter interface configuration mode. The specified interface must be one of the following: • A routed port: a physical port that has been configured as a Layer 3 port by entering the no switchport interface configuration command. • An SVI: a VLAN interface created by using the interface vlan vlan-id global configuration command. These interfaces must have IP addresses assigned to them. For more information, see the "Configuring Layer 3 Interfaces" section on page 10-19. Configure the PIM version on the interface. By default, Version 2 is enabled and is the recommended setting. An interface in PIMv2 mode automatically downgrades to PIMv1 mode if that interface has a PIMv1 neighbor. The interface returns to Version 2 mode after all Version 1 neighbors are shut down or upgraded. For more information, see the "PIMv1 and PIMv2 Interoperability" section on page 32-8. 32-10 Catalyst 3560 Switch Software Configuration Guide 78-16156-01
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