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Forum Discussion
GS724TP Tunk Port Randomly Disabling
New install. About once a week for the past 3 weeks, it was installed 3ish weeks ago, the trunk port on my GS724TP has been disabling itself. The first/second time, I didn't have logging enabled, I'm new to Netgear Switches, but this latest time I made sure it was. Here are the relevant logs:
<182>1 2022-06-06T08:04:56.830-6:00Z 192.168.101.10-1 LLDP-6-NEIGHBOR_DEL proto_lldp.c(4957) %% Neighbor deleted on port GigabitEthernet24: Chassis ID AC:17:C8:CF:C5:AD, Port ID 2
<181>1 2022-06-06T08:04:55.340-6:00Z 192.168.101.10-1 TRAPMGR-5-PORT_LINK_DOWN ksi_snmp.c(230) %% Interface GigabitEthernet24 link down
<180>1 2022-06-06T08:04:55.330-6:00Z 192.168.101.10-1 PORT-4-ERR_DISABLE rsd_port.c(950) %% loopback-detection error detected on GigabitEthernet24, putting GigabitEthernet24 in err-disable state
If I'm reading the log correctly, Port 4 is the culprit, which doesn't make sense. Ports 2,4,6,8, and 10 are on a separate VLAN, VLAN 33, which isn't setup on the switch Trunk Port, Port 24, it's not even setup in the Meraki router as it's not necessary. VLAN 33 is for the Comcast VoIP system we use, and is segregated to those ports. Comcast has an Edgewater device, the brains of the system, which is on Port 10, the other ports, 2,4,6, and 8, are the phones.
Rebooting the switch temporarily fixes the problem, for about a week. In searching for a solution, the only thing I found was disabling the L2 Loop Protection, which doesn't make sense as no loop should exist at all, even though that seems to be the cause.
So... am I reading the logs correctly? Is disabling the L2 Loop Protection a proper course of action for a resolution? Any other thoughts or suggestions?
4 Replies
Welcome to the community!
Based on the logs you posted, port 4 isn't the culprit and it's most likely port 24.
Were you able to disable L2 Loop Protection to see if that resolved the issue?
If not, please provide a screenshot showing the ports' VLAN configuration on Switching > VLAN > Advanced > Port PVID Configuration.
Regards,
JeraldM
NETGEAR Community Team
Thank you, wish I was here under better circumstances.
I did disable the L2 Loop Protection.
The problem hasn't reappeared yet, but it still may be too early to know if it has been resolved as it keeps happening 1 week + 1 day after the previous time or so it seems.
I've attached a screenshot of the VLAN port config. I'm not an expert in switching, but I don't see any errors. It's a very basic setup.
VLAN 1 - native VLAN - WAP
VLAN 25 - security cameras/NVR
VLAN 33 - Comcast VoIP phones, self contained as it has it's own modem to the internet
I do have a working theory as to the cause of the problem, the SONOS system installed at the location. They are all hardwired, except 1 speaker which is wireless. When hardwired they are supposed to disable/not use the wireless. These are the only devices on the network with multiple network connections and the only ones that I can see being the cause. While they aren't connected to the GS724TP directly, the wireless access points are and if they are, for some reason, using the wireless network, that may be causing the loop. Yesterday, I manually disabled the wireless option on each of the speakers except for the one that isn't hardwired.
To give a better idea of the physical setup:
Meraki MX67 Port 3 > Un-managed Netgear Switch > Un-managed SONOS Netgear Switch
Meraki MX67 Port 4 > GS724TP Port 24
I really didn't want to make 2 changes to the network at once (troubleshooting 101), but I really couldn't afford to have the network go down again. If the network is stable for the next few days or even the next week, I will re-enable the L2 Loop Protection.
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