Pim-Dm Interface Configuration; Pim Global Settings; Pim Interface Settings - D-Link xStack DES-3800 Series User Manual

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
Assert Messages
At times on the PIM-SM enabled network, parallel paths are created from source to receiver, meaning some receivers will receive
the same multicast packets twice. To improve this situation, Assert messages are sent from the receiving device to both multicast
sources to determine which single router will send the receiver the necessary multicast data. The source with the shortest metric
(hop count) will be elected as the primary multicast source. This metric value is included within the Assert message.

PIM-DM Interface Configuration

The Protocol Independent Multicast - Dense Mode (PIM-DM) protocol should be used in networks with a low delay (low latency)
and high bandwidth as PIM-DM is optimized to guarantee delivery of multicast packets, not to reduce overhead.
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 Global Settings

To enable PIM globally on the Switch, go to Configuration > Layer 3 IP Networking > IP Multicast Routing Protocol > PIM
Protocol > PIM Global Settings. This will give the user access to the following screen:
Figure 8- 69. PIM Global Settings window
Use the pull-down menu, choose Enabled, and click Apply to set the PIM function on the Switch.

PIM Interface Settings

To configure the settings for the PIM Protocol per IP interface, go to Configuration > Layer 3 IP Networking > IP Multicast
Routing Protocol > PIM Protocol > PIM Interface Settings. This will give the user access to the following screen:
Figure 8- 70. PIM Interface Settings window
To configure an IP interface for PIM, click its corresponding link which will lead you to the following screen:
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