Dell N3200-ON Networking N-Series Switches User Guide version 6.8.0 - Page 104

Internet Small Computer System Interface (iSCSI) Optimization The iSCSI Optimization feature helps network administrators track iSCSI traffic between iSCSI initiator and target systems. This is accomplished by monitoring, or snooping traffic to detect packets used by iSCSI stations in establishing iSCSI sessions and connections. Data from these exchanges may optionally be used to create classification rules to assign the traffic between the stations to a configured traffic class. This affects how the packets in the flow are queued and scheduled for egress on the destination port. For information about configuring iSCSI settings, see "iSCSI Optimization" on page 615. Layer-2 Multicast Features For information about configuring Layer-2 multicast features, see "Layer-2 Multicast Features" on page 919. MAC Multicast Support Multicast service is a limited broadcast service that supports one-to-many and many-to-many forwarding behavior. In the Layer-2 multicast service, a single frame addressed to a specific multicast address is received and copies of the frame to be transmitted on each relevant port are forwarded. IGMP Snooping Internet Group Management Protocol (IGMP) Snooping is a feature that allows a switch to forward multicast traffic intelligently on the switch. Multicast traffic is traffic that is destined to a host group. Host groups are identified by the destination MAC address, i.e. the range 01:00:5e:00:00:00 to 01:00:5e:7f:ff:ff:ff for IPv4 multicast traffic or 33:33:xx:xx:xx:xx for IPv6 multicast traffic. Based on the IGMP query and report messages, the switch forwards traffic only to the ports that request the multicast traffic. This prevents the switch from broadcasting the traffic to all ports and possibly affecting network performance. 104 Switch Feature Overview