Intel ZT 8101 10/100 user manual Static Router Port, Using the Telnet Console

		Using the Telnet Console
2. Configure these fields.
	Field	Description
		Specifies the name of an IP interface that you want to configure for PIM-DM.
	Interface Name	This must be a previously-defined IP interface. The IP Address field
		displays the address associated with the IP interface.
		Specifies the interval between sending Hello packets to other routers on the
		network. The Hello messages are used by the router to determine whether it
	Hello Interval	is the root router on the delivery tree or not. If the router does not receive a
		Hello message within the Hello Interval, it will begin transmitting Hello
		messages to advertise its availability to become the root router. The range is
		between 1—65535 seconds. The default is 30 seconds.
	State	Disables or enables PIM-DM for this IP interface.
		Specifies the interval for performing these tasks:
		• Removing prune information from a branch of a multicast delivery tree.
	Join-Prune Interval	• Flooding multicast messages to all branches of that delivery tree.
		These two actions are equivalent. The range is between 1—65535
		seconds. The default is 60 seconds.

3. Highlight APPLY and press Enter.

Static Router Port

A static router port allows UDP multicast and IGMP packets to be forwarded to a designated port regardless of VLAN configuration.

A router port functions within Layer 2 of the OSI model. A static router port is a port that has a router attached to it. Generally, this router would have a connection to a WAN or to the Internet. Establishing a router port will allow multicast packets coming from the router to be propagated through the network. It also allows multicast messages coming from the network to be propagated to the router.

The purpose of a router port is to enable UDP multicast packets and IGMP multicast group membership messages to reach multiple ports of a multi-port router. Routers do not implement IGMP snooping or transmit/forward IGMP report packets. Thus, forwarding all IP UDP multicast packets to a static router port on the ZT 8101 switch guarantees that all ports of a multi-port router, which are attached to the switch, can reach all multicast group members through the attached router's other ports.

A router port interacts with multicast packets in these ways:

•All IGMP report packets will be forwarded to the router port.

•IGMP queries (from the router port) will be flooded to all ports.

•All UDP multicast packets will be forwarded to the router port. Because routers do not send IGMP reports or implement IGMP snooping, a multi-port router connected to the router port of the Layer 3 switch would not be able to receive UDP data streams from its ports unless the UDP multicast packets were all forwarded to the router port.

The switch dynamically configures a router port when it detects IGMP query packets, RIPv2 multicast, DVMRP multicast, PIM-DM multicast packets flowing into a port.

Intel® NetStructure™ ZT 8101 10/100 Ethernet Switch User’s Manual 87