Configuration Guide User guide

FastIron Configuration Guide 1525
53-1002494-02
PIM Dense
The CLI commands for configuring and managing PIM DM are the same for V1 and V2. The only
difference is the command you use to enable the protocol on an interface.
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 does not 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).
PIM DM configuration
NOTE
This section describes how to configure the “dense” mode of PIM, described in RFC 1075. Refer to
“PIM Sparse configuration” on page 1533 for information about configuring PIM Sparse.
Enabling PIM on the router and an interface
By default, PIM is disabled. To enable PIM,perform the following:
• 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.
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 Brocade
routers that connect the various buildings need to be configured to support PIM multicasts from
the designated video conference server as shown in Figure 172 on page 1523.
PIM is enabled on each of the Brocade routers shown in Figure 172, 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.
Brocade(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.