D-Link DES-3326 manual Interface Name, 231

DES-3326 Layer 3 Fast Ethernet Switch User’s Guide

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.

The following fields can be set:

	Parameter	Description
	Interface Name	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.
	IP Address	Displays the IP address for the IP
		interface named above.
	Hello Interval <30	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.
	Join/Prune	This field allows an entry of between
	Interval <60 >	0 and 18724 seconds. The default is
		60 seconds.
	State <Disabled>	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.

Port Mirroring

To configure a port for port mirroring:

Click the Mirroring link and then the Target Port Selection link:

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