152 | iSCSI Optimizationw w w . d e l l . c o m | s u p p o r t . d e l l . c o m The Aggregator auto-configures as follows:• Jumbo frame size is set to 12000 for all interfaces on all ports and port-channels, if it is not alreadyenabled.• Unicast storm control is disabled on the interface identified by LLDP.iSCSI Optimization: OperationWhen the Aggregator auto-configures with iSCSI enabled, the following actions occur:• Link-level flow control is globally enabled and PFC is disabled.• iSCSI session snooping is enabled.• iSCSI LLDP monitoring starts to automatically detect EqualLogic arrays.iSCSI optimization requires LLDP to be enabled. LLDP is enabled by default when an Aggregatorauto-configures.The following message is displayed when you enable iSCSI on a switch and describes the configurationchanges that are automatically performed:%STKUNIT0-M:CP %IFMGR-5-IFM_ISCSI_ENABLE: iSCSI has been enabled causing flowcontrol to be enabled on all interfaces. EQL detection and enabling iscsiprofile-compellent on an interface may cause some automatic configurations tooccur like jumbo frames on all ports and no storm control and spanning treeport-fast on the port of detection.Default iSCSI Optimization ValuesTable 11-1 shows the default values for the iSCSI optimization feature.Table 11-1. iSCSI Optimization: Default ParametersParameter Default ValueiSCSI Optimization global setting EnablediSCSI CoS mode (802.1p priority queuemapping)Enabled: dot1p priority 4 without remark settingiSCSI CoS Packet classification iSCSI packets are classified by VLAN instead of by DSCP values.VLAN priority tag iSCSI flows are assigned by default to dot1p priority 4 without remarksetting.DSCP None: user-configurable.Remark Not configured.iSCSI session aging time 10 minutesiSCSI optimization target ports iSCSI well-known ports 3260 and 860 are configured as default (with no IPaddress or name) but can be removed as any other configured target.
