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● Target’s IQN
● Initiator’s TCP Port
● Target’s TCP Port
If no iSCSI traffic is detected for a session during a user-configurable aging period, the session data clears.
Synchronizing iSCSI Sessions Learned on VLT-Lags
with VLT-Peer
The following behavior occurs during synchronization of iSCSI sessions.
● If the iSCSI login request packet is received on a port belonging to a VLT lag, the information is synced to the VLT peer and
the connection is associated with this interface.
● Additional updates to connections (including aging updates) that are learnt on VLT lag members are synced to the peer.
● When receiving an iSCSI login request on a non-VLT interface followed by a response from a VLT interface, the session is
not synced since it is initially learnt on a non-VLT interface through the request packet.
● The peer generates a new connection log that sees the login response packet. If the login response packet uses the ICL
path, it is seen by both the peers, which in turn generate logs for this connection.
iSCSI Optimization: Operation
When the Aggregator auto-configures with iSCSI enabled, the following 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.
iSCSI optimization requires LLDP to be enabled. LLDP is enabled by default when an Aggregator auto-configures.
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.
Configuring iSCSI Optimization
To configure iSCSI optimization, use the following commands.
1. For a non-DCB environment: Enable iSCSI.
CONFIGURATION mode
iscsi enable
2. (Optional) Configure the iSCSI target ports and optionally the IP addresses on which iSCSI communication is monitored.
CONFIGURATION mode
[no] iscsi target port tcp-port-1 [tcp-port-2...tcp-port-16] [ip-address address]
● tcp-port-n is the TCP port number or a list of TCP port numbers on which the iSCSI target listens to requests. You
can configure up to 16 target TCP ports on the switch in one command or multiple commands. The default is 860, 3260.
Separate port numbers with a comma. If multiple IP addresses are mapped to a single TCP port, use the no iscsi
target port tcp-port-n command to remove all IP addresses assigned to the TCP number.
To delete a specific IP address from the TCP port, use the no iscsi target port tcp-port-n ip-address
address command to specify the address to be deleted.
● ip-address specifies the IP address of the iSCSI target. When you enter the no form of the command, and the TCP
port you want to delete is one bound to a specific IP address, include the IP address value in the command.
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iSCSI Optimization