Administrator Guide

Information Monitored in iSCSI Traffic
Flows
iSCSI optimization examines the following data in packets and uses the data to track the session and create
the classifier entries that enable QoS treatment:
• Initiator’s IP Address
• Target’s IP Address
• ISID (Initiator defined session identifier)
• Initiator’s IQN (iSCSI qualified name)
• 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.
iSCSI Optimization 491