414 Configuring iSCSI OptimizationHow Does iSCSI Optimization Interact With Dell EqualLogic Arrays?The iSCSI feature includes auto-provisioning support with the ability todetect directly connected Dell EqualLogic SAN storage arrays andautomatically reconfigure the switch to enhance storage traffic flows.The PowerConnect 8024/8024F switch uses LLDP, a vendor-neutral protocol,to discover Dell EqualLogic devices on the network. LLDP is enabled bydefault. For more information about LLDP, see "Discovering NetworkDevices" on page 647.When the switch detects a Dell EqualLogic array, the following actions occur:• An MTU of 9216 is enabled on all ports and port-channels, if it is notalready enabled.• Spanning-Tree portfast is enabled on the interface identified by LLDP.• Unicast storm control is disabled on the interface identified by LLDP.If the iSCSI CoS policy feature is enabled on the switch and an EqualLogicarray is detected, the switch applies additional iSCSI CoS policies to theEqualLogic inter-array traffic on TCP ports 9876 and 25555. If the iSCSI CoSpolicy is disabled and EqualLogic arrays are present, the additional CoSpolicy is removed globally.What Occurs When iSCSI Optimization Is Enabled or Disabled?When iSCSI is enabled on the switch, the following actions occur:• Flow control is globally enabled, if it is not already enabled.• iSCSI session snooping is enabled• iSCSI LLDP monitoring starts to automatically detect Dell EqualLogicarrays.If the iSCSI feature is disabled on the switch, iSCSI resources are releasedand the detection of Dell EqualLogic arrays by using LLDP is disabled.Disabling iSCSI does not remove the MTU, flow control, portfast or stormcontrol configuration applied as a result of enabling iSCSI. iSCSIOptimization is enabled by default.
