OK seen the corrections about priorities.
Apart from that if I were you I will review the STP configuration across all switches (personally, if there isn't a reason not to do so, I would force STP to use RSTP mode) to exclude it is something related to topology.
Original Message:
Sent: 2/14/2025 10:30:00 AM
From: parnassus
Subject: RE: Intermittent Network Dropouts
Hi!
"I have 3 rows. Row 1 (coreswitch) with root prio 4096, row 2 (Access/Dist-Layer Switches) with root prio 12288 and row 3 (Desktop Switches) with root prio 2048."
Why your Core Switch hasn't the highest priority (lower value)?
I would have set the Core to use (just an example) 0 then Row 2 to use 4096 and Row 3 to use 8192.
Original Message:
Sent: 2/14/2025 9:17:00 AM
From: miu1
Subject: RE: Intermittent Network Dropouts
Thank you in advance!
the last topology change was 12 days ago when I configured the STP. I have 3 rows. Row 1 (coreswitch) with root prio 4096, row 2 (Access/Dist-Layer Switches) with root prio 12288 and row 3 (Desktop Switches) with root prio 20480.
One thing I don't get at the moment is the output difference between "sh span" where all seems to be fine and "sh span ins ist", where every switch says "Regional Root Port: This switch is root". May there be a configuration issue here?
Edit: I just noticed that STP is configured but MST is forced. I will change this this tonight. (But anyways at the moment I can't beliefe that my network dropouts issue has anything to to with the stp configuration.)
Original Message:
Sent: Feb 14, 2025 07:51 AM
From: parnassus
Subject: Intermittent Network Dropouts
Hi! is your network topology consistently and costantly loop-free? I mean, supposing STP is properly configured (improperly said: you deployed - example - RSTP across all your network, STP Root is set to be your Core, with STP root protection was enabled on all downliks to Distribution switches, STP configuration is consistent across all switches, from Core to Access, etc.), are you observing anything strange - topology changes - on STP side at Core? Do you have oversubscribed interfaces (maybe to Servers or between mostly used switches and the Core)?
Original Message:
Sent: 2/14/2025 7:08:00 AM
From: miu1
Subject: RE: Intermittent Network Dropouts
@GorazdKikelj as the issue happens on the whole network from the coreswitch where the clients are "directly" connected switch to a 3rd row-Switch (desktop-switch -> distribution-switch -> core-switch) I wouldn't think this is a L1 issue. But I will double check it, thank you.
@Herman Robers Yes, I think, this is a side effect as every event where the port goes offline stp will block it. I also don't think it has something to do with stp in general.
I didn't roll out the port config yet on all clientports, but the port config of a client port is like this
interface A2 speed-duplex auto-1000 untagged vlan 10 spanning-tree admin-edge-port spanning-tree bpdu-protection loop-protect exit
Original Message:
Sent: Feb 14, 2025 06:37 AM
From: Herman Robers
Subject: Intermittent Network Dropouts
Those STP messages are probably only a side effect, not the problem itself.
From the logs, you see a repeat of: port off-line, few seconds, then at the same time first Blocked by STP, then immediately after port on-line. This looks like the link is really going down, but it's happening quite often. What is the port configuration from a STP perspective? Admin-edge for client ports?
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Herman Robers
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If you have urgent issues, always contact your HPE Aruba Networking partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact HPE Aruba Networking TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or HPE Aruba Networking.
In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
Original Message:
Sent: Feb 13, 2025 05:09 AM
From: miu1
Subject: Intermittent Network Dropouts
Hello everyone,
I'm facing an issue that I just can't seem to resolve.
Users are increasingly reporting brief network interruptions, which cause their connections to the terminal server and ERP system to drop. During these outages, the network connection icon changes to the globe symbol, and pings are temporarily lost. There are no relevant logs in the client's event viewer at the time of the disconnection.
On our HP Aruba switches, I notice brief offline-online transitions. Since enabling Spanning Tree, I occasionally see "Blocked by STP" messages, but I assume this is normal during port status changes. Loop Protect hasn't helped either.
All drivers, switch and client firmware, as well as BIOS versions, are up to date. Forcing speed and duplex settings on the switch with speed-duplex auto-1000 has had no effect, and adjusting these settings on the client side hasn't improved the situation either.
We exclusively use the following switches:
- J9851A (Firmware: KB.16.11.0023, ROM: KB.16.01.0009)
- J9774A (Firmware: YA.16.11.0023, ROM: YA.15.20)
- JL357A (Firmware: YC.16.11.0023, ROM: YC.16.01.0003)
So far, the issue seems to affect only Windows 10/11 devices.
Does anyone have any ideas on where else I could look? Any help would be greatly appreciated!
Thanks in advance!