3Com SuperStack 4 Configuration Manual page 177

After PIM-DM is enabled on an interface, it will send PIM Hello messages
periodically and process protocol packets sent by PIM neighbors.
Perform the following configuration in Interface view.
Table 202 Enabling PIM-DM
Operation
Enable PIM-DM on an interface
Disable PIM-DM on an interface
3Com recommends that you configure PIM-DM on all interfaces in non-special
cases. This configuration is effective only after the multicast routing is enabled in
System View.
Once PIM-DM is enabled on an interface, PIM-SM cannot be enabled on the same
interface and vice versa.
Entering the PIM View
Global parameters of PIM should be configured in PIM View.
Perform the following configuration in System View.
Table 203 Entering PIM view
Operation
Enter PIM view
Back to system view
Using command, you can clear the configuration in PIM view, and back
undo pim
to system view.
Configuring Sending Interval for the Hello Packets
After PIM is enabled on an interface, it will send Hello messages periodically on the
interface. The interval at which Hello messages are sent can be modified according
to the bandwidth and type of the network connected to the interface.
Perform the following configuration in Interface view.
Table 204 Configuring hello message interval on an interface
Operation
Configure the hello message interval on an interface
Restore the interval to the default value
The default interval is 30 seconds. You can configure the value according to
different network environments. Generally, this parameter does not need to be
modified.
This configuration can be performed only after PIM (PIM-DM or PIM-SM) is
enabled in Interface View.
Command
pim dm
undo pim dm
Command
pim
undo pim
Command
pim timer hello
undo pim timer hello
PIM-DM Overview 189
seconds