Rolling EPLD Upgrade on Cisco MDS 9000 Series Switch

B.

The rolling EPLD (Field-Programmable Gate Array (FPGA) and ASIC) upgrade on a Cisco MDS 9000 Series Switch is a process of upgrading the hardware components of the switch without causing any significant disruption to the network.

In this process, the upgrade is performed one module at a time, allowing the switch to remain operational during the upgrade process. The upgraded module is brought back online before the next module is upgraded, ensuring that network connectivity is not lost. This process continues until all the modules have been upgraded.

Regarding the given options, the correct answer is B. Only the modules that are being upgraded are disrupted. This means that the modules being upgraded will experience a brief period of downtime, but the other modules on the switch will continue to function normally.

Option A is incorrect because the standby supervisor module is not involved in the EPLD upgrade process. The active supervisor module manages the upgrade process.

Option C is also incorrect because all modules on the switch are not disrupted during the EPLD upgrade. Only the modules being upgraded are affected.

Option D is also incorrect because an EPLD upgrade is not entirely non-disruptive. While the upgrade process is designed to minimize disruption, there is still a brief period of downtime for each module that is being upgraded.