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Forum Discussion

XDRich's avatar
XDRich
Guide
Feb 15, 2017
Solved

STP Leak using Broadcast packet 01:80:c2:00:00:1c

Netgear Support,   Please take note that the community and several customers have discovered a possible flaw in your STP implementation that causes CPU panic and circular broadcasts that disable sw...
Firmware
Hardware
Security
LarryV's avatar
LarryV
Aspirant
May 25, 2017

We have hundreds of Netgear switches and hundreds of UniFi APs under management at various sites.  We're only having this problem with one GSM7224 (not listed in the pulldown above).  It is not stacked. We have another identical switch in another building at this site and it is not exhibiting the issue.  I found that the good one was running 8.0.1.26 firmware while the broken on was at 8.0.1.36.  Downgrading to the older firmware on that switch did not resolve the issue however.  We've implemented the temp fix as recommended here and are wating for something permanent.

LaurentMa's avatar
LaurentMa
NETGEAR Expert
May 30, 2017

Hi 

 

Sorry for this issue. Is your GSM7224 a M4100 GSM7224v2h2 (M4100-26G) for which we are releasing 10.0.2.25?

 

Regards,

  • LarryV's avatar
    LarryV
    Aspirant
    Jun 06, 2017

    Nope. This is an old-fashioned GSM7224V2 running 8.0.1.26.  I had downgraded from 8.0.1.36 because we have another identical switch at this location that was not impacted by the UniFi upgrade.  That didn't resolve the problem and I have no idea why one switch is fine and the other is problematic.

      • XDRich's avatar
        XDRich
        Guide
        Jun 20, 2017

        I can confirm the latest firmware has fixed the leaking broadcast packet storm.

        I have two GS716Tv3 and a GS710TP all attached in LAG loops for redundancy.

        GS716Tv3 code = v6.3.1.19

        GS710TP code = v5.4.2.30

        I have 4 Vlans spanning the Lags.

         

        I have updated all the Ubiquity AP's to the latest code.

        Removed all MAC acls.

         

        All is working as expected, APs broadcast this packet when a client roams.

        Only one packet now per roaming event.

         

        Excellent work Netgear.  Thank you for the fix and for helping the community.

         

        -Rich

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