Fibre Channel Addressing and Routing Fabric Configuration Process
Port Init
Stage 1: Link Initialization
Loop Init
Loop init success
FL_PORT
FL capable Loop init failure Not FL capable
Link Init
Success
Send ELP
FLOGI received
SW_ACC received
ELP frame:
• Switch name (WWN) • Link # • Buffer-to-buffer credit • Classes of Service • Timeout values • Bridge Port Bit
No FLOGI or ELP received
Link Reset F_PORT
Optional
E_PORT Send ESC
ESC frame:
• List of supported routing protocols
• Vendor proprietary
To determine the operating port mode, the switch port attempts to perform Loop Initialization (if the port supports L_Port operation). If loop initialization is successful, the switch then proceeds accordingly. All activity on the switch port is suspended until the loop initialization is completed.