Users Guide

switch is congured to use dot1p priority-queue assignments to ensure that iSCSI trac in these sessions receives priority treatment
when forwarded on stacked switch hardware.
Figure 60. iSCSI Optimization Example
Monitoring iSCSI Trac Flows
The switch snoops iSCSI session-establishment and termination packets by installing classier rules that trap iSCSI protocol packets
to the CPU for examination.
Devices that initiate iSCSI sessions usually use well-known TCP ports 3260 or 860 to contact targets. When you enable iSCSI
optimization, by default the switch identies IP packets to or from these ports as iSCSI trac.
You can congure the switch to monitor trac for additional port numbers or a combination of port number and target IP address,
and you can remove the well-known port numbers from monitoring.
Application of Quality of Service to iSCSI Trac Flows
You can congure iSCSI CoS mode. This mode controls whether CoS (dot1p priority) queue assignment and/or packet marking is
performed on iSCSI trac.
When you enable iSCSI CoS mode, the CoS policy is applied to iSCSI trac. When you disable iSCSI CoS mode, iSCSI sessions and
connections are still detected and displayed in the status tables, but no CoS policy is applied to iSCSI trac.
iSCSI Optimization
441