D-Link DES-3350SR User Manual page 137

The PIM-DM multicast routing protocol is assumes that all downstream routers want to receive multicast messages and relies upon
explicit prune messages from downstream routers to remove branches from the multicast delivery tree that do not contain multicast
group members.
PIM-DM has no explicit 'join' messages. It relies upon periodic flooding of multicast messages to all interfaces and then either
waiting for a timer to expire (the Join/Prune Interval) or for the downstream routers to transmit explicit 'prune' messages
indicating that there are no multicast members on their respective branches. PIM-DM then removes these branches ('prunes' them)
from the multicast delivery tree.
Because a member of a pruned branch of a multicast delivery tree may want to join a multicast delivery group (at some point in the
future), the protocol periodically removes the 'prune' information from its database and floods multicast messages to all interfaces
on that branch. The interval for removing 'prune' information is the Join/Prune Interval.
PIM-DM Interface Settings
Click Configuration > Layer 3 IP Networking > IP Multicast Routing Protocol > PIM > PIM-DM Interface Settings. This
window allows the PIM-DM to be configured for each IP interface defined on the Switch. Each IP interface configured on the
Switch is displayed in the below PIM-DM Interface Settings dialog box. To configure PIM-DM for a particular interface, click
the corresponding hyperlink for that IP interface. This will open the PIM-DM Interface Settings window:
To view the configuration window for a specific entry, click its hyperlinked name, revealing the following window.
The following fields can be set or viewed:
Parameters
D-Link DES-3350SR Standalone Layer 3 Switch
Figure 9 - 47. PIM-DM Interface Table
Figure 9 - 48. PIM-DM Interface Configuration window
Description
Interface Name
IP Address
Hello Interval (1-
18724)
Join/Prune Interval (1-
18724)
State
Allows the entry of the name of the IP
interface for which PIM-DM is to be
configured. This must be a previously
defined IP interface.
Displays the IP address for the IP interface
named above.
This field allows an entry of between 1 and
18724 seconds and determines the interval
between sending Hello packets to other
routers on the network. The default is 30
seconds.
This field allows an entry of between 1 and
18724 seconds. This
determines the time interval the router uses
to automatically remove prune information
from a branch of a multicast delivery tree
and begin to flood multicast messages to
all branches of that delivery tree. These
two actions are equivalent. The default is
60 seconds.
This field can be toggled between Enabled
and Disabled using the pull-down menu,
and is used to enable or disable PIM-DM
for the IP interface. The default is Disabled.
127
interval also