HPE 1920-16G Switch : link status is UP and DOWN

[Andrea Cotignoli]

Hi,
since 2 days we're experiencing errors reported below:

Oct 23 14:28:27:925 2018 LLDP Information LLDP_CREATE_NEIGHBOR New neighbor created on Port GigabitEthernet1/0/9 (IfIndex 18907136), Chassis ID is 8c3b-ad22-acd0, Port ID is g13.
Oct 23 14:28:01:667 2018 MSTP Information MSTP_NOTIFIED_TC Instance 0's port GigabitEthernet1/0/9 was notified of a topology change.
Oct 23 14:28:01:652 2018 MSTP Information MSTP_DETECTED_TC Instance 0's port GigabitEthernet1/0/9 detected a topology change.
Oct 23 14:27:57:318 2018 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/9 has been set to forwarding state.
Oct 23 14:27:57:302 2018 IFNET Error LINK_UPDOWN GigabitEthernet1/0/9 link status is UP.
Oct 23 14:27:54:360 2018 IFNET Error LINK_UPDOWN GigabitEthernet1/0/9 link status is DOWN.
Oct 23 14:27:52:902 2018 LLDP Information LLDP_CREATE_NEIGHBOR New neighbor created on Port GigabitEthernet1/0/9 (IfIndex 18907136), Chassis ID is 8c3b-ad22-acd0, Port ID is g13.
Oct 23 14:27:52:881 2018 MSTP Information MSTP_NOTIFIED_TC Instance 0's port GigabitEthernet1/0/9 was notified of a topology change.
Oct 23 14:27:52:858 2018 MSTP Information MSTP_DETECTED_TC Instance 0's port GigabitEthernet1/0/9 detected a topology change.
Oct 23 14:27:52:462 2018 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/9 has been set to forwarding state.
Oct 23 14:27:52:445 2018 IFNET Error LINK_UPDOWN GigabitEthernet1/0/9 link status is UP.
Oct 23 14:27:49:576 2018 IFNET Error LINK_UPDOWN GigabitEthernet1/0/9 link status is DOWN.
Oct 23 14:27:00:911 2018 MSTP Information MSTP_NOTIFIED_TC Instance 0's port GigabitEthernet1/0/9 was notified of a topology change.
Oct 23 14:27:00:911 2018 MSTP Information MSTP_DETECTED_TC Instance 0's port GigabitEthernet1/0/9 detected a topology change.
Oct 23 14:26:57:435 2018 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/9 has been set to forwarding state.
Oct 23 14:26:57:418 2018 IFNET Error LINK_UPDOWN GigabitEthernet1/0/9 link status is UP.
Oct 23 14:26:54:610 2018 IFNET Error LINK_UPDOWN GigabitEthernet1/0/9 link status is DOWN.

This morning we updated firmware to latest version (JG923A-CMW520-R1120)  but problem persists.

Can somebody help me identifying what causes this issue?

Thanks in advance,

Andrea

[parnassus]

IMHO it's not a matter of Firmware version (although running latest one is often better than nothing) but it's a matter of understanding what is connected to 1/0/9 (a Netgear device?) and how that device is interacting with your Switch.

[Andrea Cotignoli]

Thank Parnassus for your reply.

I think as well that something connected to port 1/0/9 is causing "confusion" to my Switch but I'd need help to dig more deep via software since it's a remote switch I cannot access directly so I cannot simply follow the wire to find guilty device :)

What makes you saying maybe Netgear? from those few log's line I don't see any big info. I was looking for a way to encrease log details from web interface but I cannot find it, maybe from CLI ?

Thanks,

Andrea

[parnassus · Accepted solution]

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@Andrea Cotignoli wrote: What makes you saying maybe Netgear? from those few log's line I don't see any big info.

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I noticed the MAC Address 8c3b-ad22-acd0 reported on very first list (latest logged line you pasted):

"Oct 23 14:28:27:925 2018 LLDP Information LLDP_CREATE_NEIGHBOR New neighbor created on Port GigabitEthernet1/0/9 (IfIndex 18907136), Chassis ID is 8c3b-ad22-acd0, Port ID is g13"

I suspect somebody connected a Netgear device (probably a Switch since on the very same line there is a reference to g13 port which is - if I recall correctly - a typical Netgear Switch's nomenclature to designate 13rd Gigabit Ethernet Port) and this is causing some issue on your remote network.

Probably you will need to implement some Loop Protect/BPDU Detection feature to that problematic edge port (supposing you know that on that port it should be an host and not a managed/unmanaged Switch added by someone else).

Davide.

P.S. Sei italiano?

[jaysta]

Also, when you search the MAC address in macvendors.com it comes up as Netgear.

[Andrea Cotignoli]

The issue magically disappeared so I gues it was due to an external temprary attached hardware.

Thanks.

@jaysta thanks, you're right. I checked it as well

@parnassus sì sono italiano :)