Pim Global Settings; Pim Parameter Settings - D-Link Xstack DGS-3600 Series User Manual

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 L3 Features > IP Multicast Routing Protocol > PIM > PIM Global Settings. This
will give the user access to the following screen:
Use the pull-down menu, choose Enabled, and click Apply to set the PIM function on the Switch.

PIM Parameter Settings

The following window will configure the parameter settings for the PIM distribution tree. To view this window, click L3
Features > IP Multicast Routing Protocol > PIM > PIM Parameter Settings.
The following fields can be viewed or set:
Parameter
Last Hop SPT
Switchover
Register Probe
Time
xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
Figure 8- 7 . PIM Global Settings window
Figure 8- 78. PIM Parameter Settings window
Description
This field is used by the last hop router to decide whether to receive multicast data from the
shared tree or switch over to the shortest path tree. When the switchover mode is set to
never, the last hope router will always receive multicast data from the shared tree. When the
mode is set to immediately, the last hop router will always receive data from the shortest path
tree.
This command is used to set a time to send a probe message from the DR to the RP before
the Register Suppression time expires. If a Register Stop message is received by the DR, the
Register Suppression Time will be restarted. If no Register Stop message is received within
the probe time, Register Packets will be resent to the RP. The user may configure a time
between 1 and 127 seconds with a default setting of 5 seconds.
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