Reference Guide

switch. Preferential treatment helps to avoid session interruptions during times of congestion that would otherwise cause
dropped iSCSI packets.
● iSCSI DCBx TLVs are supported.
The following illustration shows iSCSI optimization between servers and a storage array in which a stack of three switches
connect installed servers (iSCSI initiators) to a storage array (iSCSI targets) in a SAN network. iSCSI optimization running on
the master switch is configured to use dot1p priority-queue assignments to ensure that iSCSI traffic in these sessions receives
priority treatment when forwarded on stacked switch hardware.
Figure 52. iSCSI Optimization Example
Default iSCSI Optimization Values
The following table lists the default values for the iSCSI optimization feature.
Table 27. iSCSI Optimization Defaults
Parameter Default Value
iSCSI Optimization global setting
iSCSI CoS mode (802.1p priority queue mapping)
iSCSI CoS Packet classification When you enable iSCSI, iSCSI packets are queued based on
dot1p, instead of DSCP values.
iSCSI Optimization 399