Understanding NP Port Operation
Question
When an NP port becomes operational, the NP switch first logs itself into the core switch by sending a FLOGI request (using the port WWN of the NP port)
What will occur next?
Answers
Explanations
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A. B. C. D.A.
When an NP (N_Port) port becomes operational, the NP switch will send a Fibre Channel Fabric Login (FLOGI) request to log itself into the core switch, using the port World Wide Name (WWN) of the NP port. After the FLOGI request is accepted by the core switch, the NP switch will perform several additional steps to fully register with the Fibre Channel fabric.
The correct answer to the question is B: The switch will perform a PLOGI to the port login server.
After the FLOGI request is accepted, the NP switch will perform a Port Login (PLOGI) to the Port Login Server (PLS). The PLOGI will include the NP switch's port WWN, the FC-4 type of the device connected to the NP port, and other information necessary for the fabric to properly route traffic to and from the NP switch. The PLOGI request will be accepted by the PLS, and the NP switch will receive a Port Name (P_N) from the PLS.
Once the NP switch has received its P_N, it will register with the Name Server (NS) by sending a Fabric Distribution (FDISC) request. The FDISC request will include the P_N assigned by the PLS, the FC-4 type of the device connected to the NP port, and other registration parameters. The FDISC request will be accepted by the NS, and the NP switch will be added to the fabric's name server database.
Finally, the NPV (N_Port Virtualizer) switch will perform a PLOGI using FDISC to register with the fabric name server. This step is not directly related to the initial registration of the NP switch, but rather to the operation of NPV itself. The NPV switch will send a PLOGI request to the NS, including the FC-4 type of the device connected to the NPV switch, and other registration parameters. The PLOGI request will be accepted by the NS, and the NPV switch will be added to the fabric's name server database.
In summary, when an NP port becomes operational, the NP switch will send a FLOGI request to log itself into the core switch, and then perform a PLOGI to the PLS to receive a P_N. The NP switch will then register with the NS using FDISC, and the NPV switch (if present) will perform a PLOGI using FDISC to register with the NS.
