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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
246 Web-Based Switch Management
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.
To configure PIMDM for an IP interface, click the PIMDM
Interface Configuration link under the IP Multicast
Routing Protocols folder:
Figure 6-50. PIM-DM Interface Configuration
The Protocol Independent Multicast − Dense Mode (PIM-DM)
protocol can be individually configured for each IP interface on
the switch. The PIM-DM Interface Configurations dialog box
will display all of the IP interfaces currently configured on the
switch.