Configuring System Information 261Use this feature in networks containing iSCSI initiators and targets where you want to protect this trafficfrom interruption by giving the traffic preferential QoS treatment. The dynamically generated classifierrules are used to direct the iSCSI data traffic to queues that can be given the desired preferencecharacteristics over other data traveling through the switch. This can avoid session interruptions duringtimes of congestion that would otherwise cause iSCSI packets to be dropped.The preferential treatment of iSCSI traffic needs to be balanced against the needs of other critical datain the network, such as Voice over IP (VoIP) traffic.The iSCSI Optimization menu contains links to the following pages:• iSCSI Optimization Global Configuration• iSCSI Targets• iSCSI SessionsiSCSI Optimization Global ConfigurationUse the iSCSI Optimization Global Configuration page to allow the switch to snoop for iSCSIsessions/connections and to configure QoS treatment for packets where the iSCSI protocol is detected.By default, iSCSI flows are assigned to the highest VLAN priority or DSCP value VPT/DSCP mapped tothe highest queue not used for stack management or voice VLAN. Use the Quality of Service →Class ofService →Mapping Table Configuration page to configure the relevant Class of Service parameters forthe queue in order to complete the setting.To access the iSCSI Optimization Global Configuration page, click System →iSCSI →GlobalConfiguration in the navigation tree.Figure 6-128. iSCSI Optimization Global ConfigurationThe iSCSI Optimization Global Configuration page contain the following fields:
