SFP+ ports getting disabled

[ARISEIT]

Does anyone have any advice for this weird issue?

I've got a MS420-24 connected to a few MS320-48LP in my network rack; one of the MS320's keeps dropping out when connected via SFP+ DAC, but is happy when connected via ethernet.

I've tried switching ports at each end, and have tried replacing the cable multiple times.

Here is my port config on the MS420

Jun 27 12:42:00		Port STP change	Port 17 designated→disabled
Jun 27 12:42:00		Port status change	port: 17, old: 10Gfdx, new: down
Jun 27 12:41:59		Port STP change	Port 17 disabled→designated
Jun 27 12:41:59		Port status change	port: 17, old: down, new: 10Gfdx
Jun 27 12:40:52		UDLD alert	port: 17, state: unknown, port_blocked: false
Jun 27 12:40:11		Port STP change	Port 17 designated→disabled
Jun 27 12:40:11		Port status change	port: 17, old: 10Gfdx, new: down
Jun 27 12:40:11		UDLD alert	port: 17, state: unidirectional (outbound fault), port_blocked: true
Jun 27 12:40:05		Port STP change	Port 17 disabled→designated
Jun 27 12:40:05		Port status change	port: 17, old: down, new: 10Gfdx
Jun 27 12:39:56		Port STP change	Port 17 designated→disabled
Jun 27 12:39:56		Port status change	port: 17, old: 10Gfdx, new: down
Jun 27 12:39:54		Port STP change	Port 17 disabled→designated
Jun 27 12:39:54		Port status change	port: 17, old: down, new: 10Gfdx
Jun 27 12:39:52		Port STP change	Port 17 designated→disabled
Jun 27 12:39:52		Port status change	port: 17, old: 10Gfdx, new: down
Jun 27 12:39:51		Port STP change	Port 17 disabled→designated
Jun 27 12:39:51		Port status change	port: 17, old: down, new: 10Gfdx
Jun 27 12:39:48		Port STP change	Port 17 designated→disabled
Jun 27 12:39:48		Port status change	port: 17, old: 10Gfdx, new: down
Jun 27 12:39:46		Port STP change	Port 17 disabled→designated
Jun 27 12:39:46		Port status change	port: 17, old: down, new: 10Gfdx
Jun 27 12:39:44		Port STP change	Port 17 designated→disabled
Jun 27 12:39:44		Port status change	port: 17, old: 10Gfdx, new: down
Jun 27 12:39:42		Port STP change	Port 17 disabled→designated
Jun 27 12:39:42		Port status change	port: 17, old: down, new: 10Gfdx
Jun 27 12:39:11		UDLD alert	port: 17, state: unknown, port_blocked: false
Jun 27 12:38:21		Port STP change	Port 17 designated→disabled
Jun 27 12:38:21		Port status change	port: 17, old: 10Gfdx, new: down
Jun 27 12:38:21		UDLD alert	port: 17, state: unidirectional (outbound fault), port_blocked: true

[jdsilva]

Only the MS320? And you're tried different DACs? Smells like a bug to me. Maybe call into support and get them to take a look. 

[PhilipDAth]

Is it a Meraki DAC cable?

[ARISEIT]

Ooh, no it's not; I didn't think of that. All my other links are working fine on generic DAC cables

[PhilipDAth]

It is going to be tricky getting help from support.  Is the DAC cable 3m or less in length?

I would make sure you are on currently firmware like @jdsilva suggested as well.

[ARISEIT]

Yep! 1m

And yep, I'm running all current firmware.

Yarrrr

[PhilipDAth]

I think I would try the firmware update, and then buy one Meraki DAC cable, plug it in, and then contact support.

[BrechtSchamp]

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@PhilipDAth wrote:

I think I would try the firmware update, and then buy one Meraki DAC cable, plug it in, and then contact support.

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+1. It's only $100 list (MA-CBL-TA-1M).

[Brons2]

https://www.1stop.com/meraki-10-gbe-twinax-cable-with-sfp-modules-1-meter.html?language=en&currency=...

$62.64

good idea...the brown portion in the connectivity bar usually means "high proportion of CRC errors"