Switch Features 77
Internet Small Computer System Interface (iSCSI) Optimization
The iSCSI Optimization feature helps give traffic between iSCSI initiator
and target systems special QoS treatment in the switch. 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 is
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 "Configuring iSCSI
Optimization" on page 431.
Layer 2 Multicast Features
For information about configuring L2 multicast features, see "Configuring L2
Multicast Features" on page 703.
MAC Multicast Support
Multicast service is a limited broadcast service that allows one-to-many and
many-to-many connections. In Layer 2 multicast services, a single frame
addressed to a specific multicast address is received, and copies of the frame
to be transmitted on each relevant port are created.
IGMP Snooping
Internet Group Management Protocol (IGMP) Snooping is a feature that
allows a switch to forward multicast traffic intelligently on the switch.
Multicast IP traffic is traffic that is destined to a host group. Host groups are
identified by class D IP addresses, which range from 224.0.0.0 to
239.255.255.255. 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.
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