Enterasys Networks 5G1XX, 5H1XX manual Igmp Multicast Filtering, Save, Show

	Configuring SmartTrunks
Parameter	Description
SmartTrunk Priotocol	Used to select from 1 to 6 trunks. This is the group ID of the
	SmartTrunk group. It identifies the chip set to be used.
	Refer to Table 7-1for the ports associated with each
	group ID.
NO CHANGE field	Used to add or delete ports from group ID. Steps to ADD,
	DELETE, and NO CHANGE (default setting). This setting
	causes the port selected in the Port field to be added,
	deleted, or not changed when SAVE command is used.
SAVE	Saves the current values on the screen.
SHOW	Displays the SmartTrunk group listed under the
	SmartTrunk Group ID field.

The ports used for each trunk must all be on the same internal switch chip, which is synonymous with the SmartTrunk Group ID. Table 7-1identifies the ports associated with each group ID.

Table 7-1 SmartTrunk, Ports Associated with Group IDs

Group IDs	1	2	3	4	5	6
Ports	1 thru 8	9 thru16	17 thru 24	25 thru 32	33 thru 40	41 thru 48

7.7.1IGMP Multicast Filtering

Multicasting is used to support real-time applications such as video conferences 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 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 to the hosts that subscribed to this service.

This switch uses IGMP (Internet Group Management Protocol) to query for any attached hosts who want to receive a specific multicast service. The switch looks up the IP Multicast Group used for this service and adds any port that received a similar request to that group. It then propagates the service request on to any neighboring multicast switch/router to ensure that it will continue to receive the multicast service. (For more information about the use of IGMP snooping and multicast filtering, refer to Appendix D.)

Device Control Menu Screens 7-21