Netgear M4300-28G (GSM4328S) - Stackable Managed Switch with 24x1G and 4x10G including 2x10GBASE-T and 2xSFP+ Layer 3 管理者ガイド

The Internal Small Computer System Interface (iSCSI) feature is used in networks containing 
iSCSI initiators and targets where the administrator desires to protect the iSCSI traffic from 
interruption by giving the traffic preferential QoS treatment. The dynamically generated 
classifier rules are used to direct the iSCSI data traffic to queues that can be given the 
desired preference characteristics over other data transiting the switch. This can avoid 
session interruptions during times of congestion that would otherwise cause iSCSI packets to 
be dropped.

The administrator can select VLAN priority tag (VPT) or DSCP mapping for the QoS 
preferential treatment. iSCSI flows are assigned by default to the highest VPT/DSCP queue 
not used for chassis management or voice VLAN.   The administrator should also take care 
of configuring the relevant Class of Service parameters for the queue chosen in order to 
complete the setting.

The following figure shows an example of iSCSI implementation.