Administrator Guide

• Target’s TCP Port
If no iSCSI trac is detected for a session during a user-congurable aging period, the session data clears.
Detection and Auto conguration for Dell EqualLogic Arrays
The iSCSI optimization feature includes auto-provisioning support with the ability to detect directly connected Dell EqualLogic
storage arrays and automatically recongure the switch to enhance storage trac ows.
An Aggregator uses the link layer discovery protocol (LLDP) to discover Dell EqualLogic devices on the network. LLDP is enabled by
default. For more information about LLDP, refer to Link Layer Discovery Protocol (LLDP)
The following message displays the rst time a Dell EqualLogic array is detected and describes the conguration change that are
automatically performed:
%STKUNIT0-M:CP %IFMGR-5-IFM_ISCSI_AUTO_CONFIG: This switch is being configured
for optimal conditions to support iSCSI traffic which will cause some automatic
configuration to occur including jumbo frames and flow-control on all ports; no
storm control to be enabled on the port of detection.
The following syslog message is generated the rst time an EqualLogic array is detected:
%STKUNIT0-M:CP %LLDP-5-LLDP_EQL_DETECTED: EqualLogic Storage Array detected on
interface Te 1/43
• At the rst detection of an EqualLogic array, a maximum transmission unit (MTU) of 12000 is enabled on all ports and port-
channels (if it has not already been enabled).
• Unicast storm control is disabled on the interface identied by LLDP.
iSCSI Optimization: Operation
When the Aggregator auto-congures with iSCSI enabled, the following occurs:
• Link-level ow control is enabled on PFC disabled interfaces.
• 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 Aggregator auto-congures.
The following message displays when you enable iSCSI on a switch and describes the conguration changes that are automatically
performed:
%STKUNIT0-M:CP %IFMGR-5-IFM_ISCSI_ENABLE: iSCSI has been enabled causing flow
control to be enabled on all interfaces. EQL detection and enabling iscsi
profile-compellent on an interface may cause some automatic configurations to
occur like jumbo frames on all ports and no storm control and spanning tree
port-fast on the port of detection.
Displaying iSCSI Optimization Information
To display information on iSCSI optimization, use the show commands detailed in the below table:
Table 7. Displaying iSCSI Optimization Information
Command Output
show iscsi Displays the currently congured iSCSI settings.
iSCSI Optimization
107