I have a GS752TPv2 switch (1 of 3) that is connected on a main port (port 31 in this case) to a fiber transceiver which then is connected to another fiber transceiver that connects to one of the main ports on another GS752TPv2.
Error logs report below:
<181>1 2021-05-24T18:21:11.537Z 192.168.1.254-1 TRAPMGR-5-STP_NEW_ROOT ksi_snmp.c(484) %% This bridge has changed to be the root bridge.
<182>1 2021-05-24T18:21:08.557Z 192.168.1.254-1 LLDP-6-NEIGHBOR_DEL proto_lldp.c(4985) %% Neighbor deleted on port GigabitEthernet31: Chassis ID 38:94:ED:84:1B:5C, Port ID g25
<182>1 2021-05-24T18:21:08.297Z 192.168.1.254-1 STP-6-PORT_STATE proto_stp.c(820) %% Port GigabitEthernet31 moving from Forwarding to Disabled
<181>1 2021-05-24T18:21:08.167Z 192.168.1.254-1 TRAPMGR-5-PORT_LINK_DOWN ksi_snmp.c(230) %% Interface GigabitEthernet31 link down
I have attached the tech support file from the problem switch.
Below are the troubleshooting steps that I have tried:
- Updated the firmware
- Moved ports (from 31-32)
- Replaced the ethernet cable
Not really sure what else to try as most of this goes above my head. I am mainly a server tech with basic networking education/experience.
P.S. I have the tech support files but it wont let me upload them, even when changing the extension.
Model: GS752TPv2|48-Port Gigabit Ethernet PoE+ Smart Managed Pro Switch with 4 SFP Ports (380W)
The switch does only reconn the link is lost, so what the switches would expect to be a "direct" copper Ethernet link seems to be interrupted from time to time. Impossible to get more insight on what is going on on the intermediate infrastructure.
... on a main port (port 31 in this case) to a fiber transceiver which then is connected to another fiber transceiver that connects to one of the main ports ..
What ever interesting design we're facing here. Some kind of CWDM/DWDM fiber multiplexer sharing a single fiber link? Would guess there should be some kind of management/monitoring interface on these devices.
Why not terminate the fiber link (or a specific wavelength) on each switch - from where we could fetch at least some basic fiber link status information from the SFP mofules?
