Configuring IP Multicast Routing
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This enables the multicast on the router. Notice that it was executed while
in the global configuration mode. However, the router still cannot exchange
multicast information with any neighbors because none of the interfaces
have been enabled. This step is next.
Enabling PIM on an Interface
Protocol Independent Multicast (PIM) is one of the required elements for
multicast configuration. It enables IGMP on the router and allows it to
receive and forward traffic on the specified interface. PIM must be enabled
on every interface that is to participate in the multicast network.
PIM interface configuration has many options. Take a look at the avail-
able options in IOS 12.0(10)S1, shown in Table 10.1. Most of these options
are for advanced multicast configuration that won't be addressed in detail
here. The ones that will be discussed here are dense-mode, sparse-mode,
and sparse-dense-mode.
T A B L E 1 0 . 1
IP PIM Configuration Options
IP PIM Options
Description
bsr-border
Specifies border of PIM domain
dense-mode
Enables PIM dense mode operation
nbma-mode
Specifies use of Non-Broadcast Multi-Access
(NBMA) mode on interface
neighbor-filter
Specifies PIM peering filter
query-interval
Specifies PIM router query interval
sparse-dense-mode
Enables PIM sparse-dense mode operation
sparse-mode
Enables PIM sparse mode operation
version
Displays PIM version
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