Configuring Basic Multicast Routing - Cisco WS-C3560-48PS-S Software Configuration Manual
Software configuration guide
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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.
Command
Step 1
configure terminal
Step 2
ip multicast-routing distributed
Step 3
interface interface-id
Step 4
ip pim version [1 | 2]
Catalyst 3560 Switch Software Configuration Guide
32-10
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
section on page
32-8.
Chapter 32
Configuring IP Multicast Routing
"PIMv1 and PIMv2 Interoperability"
78-16156-01
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