D-Link DGS-3324SR User Manual page 142

D-Link DGS-3324SR Layer 3 Stackable Gigabit Ethernet Switch
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 Configuration
To enable PIM-DM globally on the Switch, go to Configuration >Layer 3 IP Networking > IP Multicast
Routing Protocol > PIM > PIM-DM Configuration. This will give the user access to the following screen:
Figure 4- 89. PIM DM Global Setting window
Use the pull down menu, choose Enabled, and click Apply to set the PIM-DM function on the Switch.
PIM-DM Interface Settings
To view the PIM-DM Table, 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 Configuration window:
Figure 4- 90. PIM-DM Interface Table
Figure 4- 91. PIM-DM Interface Configuration window
The following fields can be set:
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