Sunfire B1600 manual Multicast Configuration

TABLE 3-14MIB Variables Associated With Adding Ports to a VLAN (Continued)

Field Name	MIB Variable	Access	Value Range	Default Value
VLAN	MIB-II.	Read/create	Octet string
Forbidden Ports	dot1dBridge.		(port list)
	qBridgeMIB.
	qBridgeMIBObjects.
	dot1qVlan.
	dot1qPortVlanTable.
	dot1qPortVlanEntry.
	dot1qVlanForbidden-
	EgressPorts
Port Trunk Index	sun...	Read only	Integer
(Channel	portMgt.
Groups)	portTable
	portEntry.
	portTrunkIndex
VLAN Static	MIB-II.	Read/create	enable(1),
Row Status	dot1dBridge.		disable(2)
	qBridgeMIB.
	qBridgeMIBObjects.
	dot1qVlan.
	dot1qVlanStaticTable.
	dot1qVlanStaticEntry.
	dot1qVlanStatic-
	RowStatus

3.3.2Multicast Configuration

Multicasting is used to support real-time applications such as videoconferencing or streaming audio. A multicast server does not have to establish a separate connection with each client. It merely broadcasts its service to the network and any hosts that want to receive the multicast service register with their local multicast switch/ router. Although this approach reduces the network overhead required by a multicast server, the broadcast traffic must be carefully pruned at every multicast switch/router it passes through to ensure that traffic is only passed on to the hosts that subscribed to the service.

The blade system chassis switch uses the Internet Group Management Protocol (IGMP) to query for any attached hosts that want to receive a specific multicast service. It identifies the ports containing hosts requesting to join the service and sends data out to those ports only. It then propagates the service request up to any neighboring multicast switch/router to ensure that it will continue to receive the multicast service. This procedure is called multicast filtering.

3-54Sun Fire B1600 Blade System Chassis Switch Administration Guide • June 2003