Initial System Boot Up

When ExtremeXOS boots up, it reads and analyzes the installed I/O modules (BlackDiamond 8800 and X8) and Fabric modules (BlackDiamond X8 series only).

ExtremeXOS prioritizes the powering up of modules as follows (see the following figure):

BlackDiamond X8: Fabric modules are considered first for power up from the lowest numbered slot to the highest numbered slot, based on their power requirements and the available system power. I/O modules are then given priority from lowest numbered slot to highest numbered slot.
BlackDiamond 8800 series: I/O modules are considered for power up from the lowest numbered slot to the highest numbered slot, based on their power requirements and the available system power.

If the system does not have enough power, some modules are not powered up.

I/O and Fabric Module Power Priority

For example, ExtremeXOS:

Collects information about the PSUs installed to determine how many are running and how much power each can supply.
Checks for PSU failures.
Calculates the number of Fabric (BlackDiamond X8 only) and I/O modules to power up based on the available power budget and the power requirements of each I/O module, including PoE requirements for the BlackDiamond 8000 series PoE I/O module.
Reserves the amount of power required to power up a second MSM/MM if only one MSM/MM is installed.
Reserves the amount of power required to power all fans and chassis components.
Calculates the current power surplus or shortfall.
Logs and sends SNMP traps for transitions in the overall system power status, including whether the available amount of power is:
- Redundant or N+1—Power from a single PSU can be lost and no I/O or Fabric (BlackDiamond X8 only) modules are powered down.
- Sufficient, but not redundant—Power from a single PSU is lost, and one or more I/O modules (and then Fabric modules, for BlackDiamond X8 only) are powered down.
- Insufficient—One or more modules are not powered up due to a shortfall of available power.
By reading the PSU information, ExtremeXOS determines the power status and the total amount of power available to the system. The total power available determines which I/O and Fabric (BlackDiamond X8 series only) modules can be powered up.

Published March 2020prev | next

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