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What do you know about FLOGI ?

FLOGI stands for Fabric Login, which is a process in Fibre Channel (FC) that allows a Fibre Channel device to log in and establish communication with the FC fabric. During the FLOGI process, the device exchanges information with the fabric switches to acquire a Fibre Channel ID (FC_ID) and become an active participant in the fabric.

Here's an overview of how the FLOGI process works:


Device Initialization:

When a Fibre Channel device is powered on or connected to the fabric, it starts the initialization process.

The device initializes its Fibre Channel interfaces and prepares to establish a connection with the fabric.


FLOGI Request:

  • The device sends a FLOGI request frame, also known as a FLOGI primitive, to the fabric.
  • The FLOGI request contains information about the device, such as its Fibre Channel address and capabilities.


Fabric Response:

  • The fabric switches receive the FLOGI request and process it.
  • The switches assign a unique Fibre Channel ID (FC_ID) to the device.
  • The switches update their internal tables and databases to recognize the newly logged-in device.


FLOGI Accept:

  • The fabric switches send a FLOGI accept frame, also known as a FLOGI accept primitive, back to the device.
  • The FLOGI accept includes the assigned FC_ID and other relevant information.
  • The device receives the FLOGI accept and acknowledges the successful login.


Login Completion:

  • With the FLOGI process complete, the device is now considered logged into the FC fabric.
  • The device is assigned an FC_ID, which is used for addressing and routing within the fabric.
  • It can now communicate with other devices in the fabric, exchange Fibre Channel frames, and access shared resources.



The FLOGI process is a crucial step in establishing connectivity and communication between Fibre Channel devices and the fabric. It allows devices to register their presence, obtain a unique FC_ID, and become active participants in the fabric. The FLOGI process typically happens automatically and transparently when a device is connected to a Fibre Channel fabric.

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