SFP port flaps on any config change

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SFP port flaps on any config change

Fri Nov 26, 2021 9:28 am

Hey there,

I've noticed this on a few switches running 1.5.9-RC1. This switch has spanning tree enabled, I've seen it happen on switches without spanning tree as well.

This is an example when I did a tag change and added a VLAN.

Code: Select all
Nov 25 16:04:39 UI: VLAN 991 PortSettings: changed from 'UEUUUUUEUUUUUUEEEEEEEEEEET' to 'UEUUUUUEUUUUEEEEEEEEEEEEET'
Nov 25 16:04:39 UI: VLANs: added 'OFFICE_MGMT'
Nov 25 16:04:49 STP: msti 0 set port 1 to discarding
Nov 25 16:04:49 STP: msti 0 set port 2 to discarding
Nov 25 16:04:49 STP: msti 0 set port 4 to discarding
Nov 25 16:04:49 STP: msti 0 set port 5 to discarding
Nov 25 16:04:49 STP: msti 0 set port 6 to discarding
Nov 25 16:04:49 STP: msti 0 set port 7 to discarding
Nov 25 16:04:49 STP: msti 0 set port 8 to discarding
Nov 25 16:04:49 STP: msti 0 set port 9 to discarding
Nov 25 16:04:49 STP: msti 0 set port 10 to discarding
Nov 25 16:04:49 STP: msti 0 set port 11 to discarding
Nov 25 16:04:49 STP: msti 0 set port 12 to discarding
Nov 25 16:04:49 STP: msti 0 set port 13 to discarding
Nov 25 16:04:49 STP: msti 0 set port 14 to discarding
Nov 25 16:04:50 STP: msti 0 set port 26 to discarding
Nov 25 16:04:52 STP: msti 0 set port 26 to learning
Nov 25 16:04:52 STP: msti 0 set port 26 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 14 to learning
Nov 25 16:04:52 STP: msti 0 set port 14 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 13 to learning
Nov 25 16:04:52 STP: msti 0 set port 13 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 12 to learning
Nov 25 16:04:52 STP: msti 0 set port 12 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 11 to learning
Nov 25 16:04:52 STP: msti 0 set port 11 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 10 to learning
Nov 25 16:04:52 STP: msti 0 set port 10 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 9 to learning
Nov 25 16:04:52 STP: msti 0 set port 9 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 8 to learning
Nov 25 16:04:52 STP: msti 0 set port 8 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 7 to learning
Nov 25 16:04:52 STP: msti 0 set port 7 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 6 to learning
Nov 25 16:04:52 STP: msti 0 set port 6 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 5 to learning
Nov 25 16:04:52 STP: msti 0 set port 5 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 4 to learning
Nov 25 16:04:52 STP: msti 0 set port 4 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 2 to learning
Nov 25 16:04:52 STP: msti 0 set port 2 to forwarding
Nov 25 16:04:52 STP: msti 0 set port 1 to learning
Nov 25 16:04:52 STP: msti 0 set port 1 to forwarding
Nov 25 16:04:56 Port: link state changed to 'down' on port 26
Nov 25 16:04:56 STP: msti 0 set port 26 to discarding
Nov 25 16:04:59 Port: link state changed to 'up' (1G) on port 26
Nov 25 16:04:59 STP: msti 0 set port 26 to discarding
Nov 25 16:05:02 STP: msti 0 set port 26 to learning
Nov 25 16:05:02 STP: msti 0 set port 26 to forwarding

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Re: SFP port flaps on any config change

Fri Nov 26, 2021 11:52 am

Another switch with spanning-tree disabled.

Code: Select all
Nov 26 09:47:59 UI: VLAN 32 ID: changed from '32' to '1000'
Nov 26 09:48:16 Port: link state changed to 'down' on port 26
Nov 26 09:48:19 Port: link state changed to 'up' (1G) on port 26


Discovery is also disabled on all the switches.

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Re: SFP port flaps on any config change

Fri Nov 26, 2021 2:55 pm

on a 12 port unit running 1.5.9-RC1...

Code: Select all
Nov 26 12:16:03 UI: VLANs: added 'test'
Nov 26 12:16:09 Port: link state changed to 'down' on port 13
Nov 26 12:16:09 STP: msti 0 set port 13 to discarding
Nov 26 12:16:10 Port: link state changed to 'up' (1G) on port 13
Nov 26 12:16:10 STP: msti 0 set port 13 to discarding
Nov 26 12:16:12 STP: msti 0 set port 13 to learning
Nov 26 12:16:12 STP: msti 0 set port 13 to forwarding

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Re: SFP port flaps on any config change

Fri Jan 07, 2022 12:11 pm

Any update on this?

I've had to downgrade to 1.5.5 to prevent this from happening.

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Re: SFP port flaps on any config change

Tue Feb 15, 2022 12:47 pm

Bump.

Any traction on this?

Doing a vlan change and causing a temporarily network outage while the SFP bounces is pretty serve.

As my previous post, it looks something changed after 1.5.5.

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