Configuring Pim Dm - Foundry Networks FESX Manual

NOTE: Version 2 is the default PIM DM version. The only difference between version 1 and version 2 is the way
the protocol sends messages. The change is not apparent in most configurations. You can use version 2 instead
of version 1 with no impact to your network. However, if you want to continue to use PIM DM V1 on an interface,
you must change the version, then save the configuration.
NOTE: The note above doesn't mean you can run different PIM versions on devices that are connected to each
other. The devices must run the same version of PIM. If you want to connect a Layer 3 Switch running PIM to a
device that is running PIM V1, you must change the version on the Layer 3 Switch to V1 (or change the version on
the device to V2, if supported).

Configuring PIM DM

NOTE: This section describes how to configure the "dense" mode of PIM, described in RFC 1075. See
"Configuring PIM Sparse" on page 19-15 for information about configuring PIM Sparse.
Enabling PIM on the Router and an Interface
By default, PIM is disabled. To enable PIM:
• Enable the feature globally.
• Configure the IP interfaces that will use PIM.
• Enable PIM locally on the ports that have the IP interfaces you configured for PIM.
• Reload the software to place PIM into effect.
Suppose you want to initiate the use of desktop video for fellow users on a sprawling campus network. All
destination workstations have the appropriate hardware and software but the Foundry routers that connect the
various buildings need to be configured to support PIM multicasts from the designated video conference server as
shown in Figure 19.1 on page 19-7.
PIM is enabled on each of the Foundry routers shown in Figure 19.1, on which multicasts are expected. You can
enable PIM on each router independently or remotely from one of the routers with a Telnet connection. Follow the
same steps for each router. A reset of the router is required when PIM is first enabled. Thereafter, all changes are
dynamic.
Globally Enabling and Disabling PIM
To globally enable PIM, enter the following command:
FastIron SuperX Router(config)# router pim
Syntax: [no] router pim
The behavior of the [no] router pim command is as follows:
• Entering router pim command to enable PIM does not require a software reload.
• Entering a no router pim command removes all configuration for PIM multicast on a Layer 3 Switch (router
pim level) only.
Globally Enabling and Disabling PIM without Deleting Multicast Configuration
As stated above entering a no router pim command deletes the PIM configuration. If you want to disable PIM
without deleting any PIM configuration, enter the following command:
FastIron SuperX Router(config)# router pim
FastIron SuperX Router(config-pim-router)# disable-pim
Syntax: [no] disable-pim
Use the [no] version of the command to re-enable PIM.
December 2005 © Foundry Networks, Inc.
Configuring IP Multicast Protocols
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