• At the first detection of an EqualLogic array, an MTU of 12000 is enabled on all ports and port-
channels (if it has not already been enabled).
• Spanning-tree portfast is enabled on the interface LLDP identifies.
• Unicast storm control is disabled on the interface LLDP identifies.
Configuring Detection and Ports for Dell Compellent Arrays
For the best iSCSI traffic conditions, the MXL switch auto-configures a port connected to a Dell
Compellent storage array, when configured as compellent connected port through CLI.
The following message displays the first time a Dell Compellent storage array is detected and describes
the configuration changes 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 and
spanning-tree port
fast to be enabled on the port of detection.
The MXL switch auto-configures as follows:
• At the first detection, an MTU of 12000 is enabled on all ports and port-channels (if it is not already
enabled).
• Spanning-tree portfast is enabled on the interface identified by CLI, if the port is in L2 mode.
• Unicast storm control is disabled on the interface identified by CLI.
iSCSI Optimization: Operation
iSCSI optimization requires LLDP to be enabled. LLDP is enabled by default on MXL switch.
When the MXL auto-configures with iSCSI enabled, the following actions occurs:
• Link-level flow control is enabled on PFC disabled interfaces.
• iSCSI session snooping is enabled.
• iSCSI LLDP monitoring starts to automatically detect EqualLogic arrays.
The following message displays when you enable iSCSI on a switch and describes the configuration
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.
478 iSCSI Optimization