What is a characteristic of electronic programmable logic device (EPLD) software upgrades?

While Cisco TAC may provide guidance, EPLD upgrades are frequently a standard and necessary procedure during major NX-OS upgrades for compatibility and are not solely dependent on TAC instruction.

EPLD module upgrades are typically disruptive operations, often requiring a module reload or a full system reboot, which will temporarily interrupt traffic flow.

EPLD upgrades are primarily applicable to line cards and supervisor modules to update their low-level programmable logic, and are not generally available or required for power supply modules.

EPLD software versions are tightly coupled with Cisco MDS NX-OS versions; therefore, an EPLD upgrade is often mandatory when the NX-OS is upgraded to ensure full compatibility, proper functionality, and to utilize new hardware features.