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Aruba 2920 port Blocked by STP - Errors

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  • 1.  Aruba 2920 port Blocked by STP - Errors

    Posted Apr 02, 2019 03:50 PM

    I'm seeing these errors all day at a few of my remote location switches.

    **From log on switch**

    00076 ports: port 14 is now on-line
    00435 ports: port 14 is Blocked by STP
    00077 ports: port 14 is now off-line

     

    **From IMC**

    iMC alarm system found event (The interface 14 is UP.) and event (The interface 14 is DOWN.) had 3 intermittent failures

     

    All the ports doing so have a Cisco aironet 3600 series AP connected to them. Has anyone see then before and know what is going on? I was guessing maybe an LLDP or power negotation failure. Power draw is around 80w of the 370w available.

     

    Thanks in advance.

     



  • 2.  RE: Aruba 2920 port Blocked by STP - Errors

    MVP GURU
    Posted Apr 03, 2019 01:57 AM

    Hi,

     

    By default when port is UP (and there is not admin-edge port), it is blocked by STP for 3 sec (with RSTP)

     

    I think, you need to look access point log..



  • 3.  RE: Aruba 2920 port Blocked by STP - Errors

    Posted Apr 10, 2019 09:21 AM

    Thanks, I have opened a case with Cisco TAC.



  • 4.  RE: Aruba 2920 port Blocked by STP - Errors

    EMPLOYEE
    Posted Apr 10, 2019 12:56 PM

    Greetings!

     

    As noted by alagoutte, the STP port blocking is a default behavior when a port first comes up, and normally clears automatically. If you're seeing this occurring continually, the port is bouncing, and that could be either a power delivery issue or a problem with the connected AP itself causing it to continually reboot. 

     

    Are you seeing anything in the switch event logs indicating a PoE delivery error on the switch port itself?