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Aruba 6410 chassis granting most power to subsystem instead of PoE

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  • 1.  Aruba 6410 chassis granting most power to subsystem instead of PoE

    Posted Jun 14, 2022 03:11 PM

    I have a 6410 chassis with 4x 1600w PSUs in them, however only 650w is showing up as available for PoE usage. I ran a "show environment power-allocation" command and noticed 3684w out of 4334w is being granted to the Subsystems. Anyone know what is going on here?

    Hostname# show environment power-allocation

     Product                                                Power
    

    Name Number Subsystem-Type Request Priority Granted Usage


    1 R0X25A base-chassis-module N/A N/A N/A 1092 W

    1/1 R0X25A fabric-card-module 158 128 granted 73 W

    1/2 R0X25A fabric-card-module 158 128 granted 73 W

    1/1 R0X32A fan-tray-module 200 128 granted 0 W

    1/2 R0X32A fan-tray-module 200 128 granted 0 W

    1/3 R0X32A fan-tray-module 200 128 granted 0 W

    1/4 R0X32A fan-tray-module 200 128 granted 0 W

    1/3 R0X41A line-card-module 249 128 granted 83 W

    1/4 R0X41A line-card-module 249 128 granted 86 W

    1/5 R0X41A line-card-module 249 128 granted 86 W

    1/6 R0X41A line-card-module 249 128 granted 85 W

    1/7 R0X41A line-card-module 249 128 granted 101 W

    1/8 R0X41A line-card-module 249 128 granted 94 W

    1/9 R0X41A line-card-module 249 128 granted 109 W

    1/10 R0X41A line-card-module 249 128 granted 102 W

    1/11 R0X41A line-card-module 249 128 granted 95 W

    1/12 R0X41A line-card-module 249 128 granted 103 W

    1/1 R0X31A management-module 39 128 granted 13 W

    1/2 N/A management-module 39 128 granted 0 W


    Total Requested 3684 W

    Total Power Granted to Subsystems 3684 W

    Power Granted for PoE 650 W

    Total Power Granted 4334 W

    Maximum PSU Power Available 4334 W

    Power Remaining 0 W



  • 2.  RE: Aruba 6410 chassis granting most power to subsystem instead of PoE

    Posted Jun 15, 2022 04:45 AM
    The max power available of 4334 doesn't make sense to me, we've got 4 1800W power supplies and are showing 7092W available.
    What do you see when you type show environment power-supply and show environment power-redundancy?

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  • 3.  RE: Aruba 6410 chassis granting most power to subsystem instead of PoE

    MVP GURU
    Posted Jun 15, 2022 08:18 AM
    If I were you, as suggested, I'll focus first on the system power redundancy profile.

    A good source of information would be the Power Over Ethernet (PoE) Planning and Implementation Guide for AOS-CX Switches (Edition 4, May 2021), have a look particularly at the Chapter 5 "PoE planning and implementation for Aruba 6400 switches".

    Out of curiosity: what ArubaOS-CX version is the Aruba 6410 running on?



  • 4.  RE: Aruba 6410 chassis granting most power to subsystem instead of PoE
    Best Answer

    Posted Jun 15, 2022 10:36 AM
    Parnassus - I actually found that document shortly after I created this thread and that lead me to the solution. Currently, each of the power supplies is plugged into 120v, which is limiting its output to 1100w per power supply (hence only seeing 4334w​ available). In the PoE guide linked above, it breaks down how much power is required for the chassis and then each line card. The math looks like this: 

    6410 chassis: 1194w
    10x R0X41A Modules: 2490w
    Total power required for subsystem: 3684w
    Total Power Available: 4334
    Subtract power required for subsystem from total available power, and you have what is left over for PoE devices.
    4334-3684=650w

    We're going to get 240v added to that room and that will allow us to use the full 1800w of each PSU, which will give us 3408w available for PoE.