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hard to imagine why there isn't an alert for high CRC and packet loss

Getting noticed

hard to imagine why there isn't an alert for high CRC and packet loss

May 4 11:05 – May 4 12:28
Very high proportion of CRC errors
Very high rate of packet fragments

 

Surely this condition is worthy of an alert.  I just happened to be in the dashboard and noticed a switch port was red.  Or am I meant to log into the dashboard and visit every switch in every network in every org on a regular basis?

 

 

5 REPLIES 5
Kind of a big deal

Re: hard to imagine why there isn't an alert for high CRC and packet loss

I've thought the same.  Every time I've encountered one it's been stumbling into it. 

Adam R MS | CISSP, CISM, VCP, MCITP, CCNP, ITILv3, CMNO
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Kind of a big deal

Re: hard to imagine why there isn't an alert for high CRC and packet loss

The problem with this style of error is it comes and goes (usually based on load on the port).

 

You would get a lot of alert emails if there was such an option.

Getting noticed

Re: hard to imagine why there isn't an alert for high CRC and packet loss

It's an error condition that most likely coincides with diminished network performance.   It indicates some sort of problem that needs to be fixed.  In fact, Cisco obviously agrees, this is why they do currently alert on the condition (in the dashboard only).

 

High CRC errors could be caused by excessive network load, which is also a problem that would need to be addressed.  In my case, it was just a bad cable connection (loose patch cable connection; reseating fixed it).

 

Email alerts could be easily tamed with a simple threshold.  In fact, Cisco has already implemented the threshold.  That's why my error showed "very high" CRC errors and colored the port red.  They also have a "high" range (orange) and a "medium" range (yellow) (as I recall, the error is gone now after reseating cable).

 

Simple solution.  Send email alert when there are "high" or "very high" CRC errors for more than X mins.  I'm basically asking them to add one additional action.  When you make the port turn orange or red, go ahead and send me an email so that I might actually notice it and take action.

 

 

Getting noticed

Re: hard to imagine why there isn't an alert for high CRC and packet loss

Over a year goes by and Cisco can't even be bothered to respond, much less implement this incredibly useful, very simple request.  The arrogance is unreal. 

Highlighted
Meraki Employee

Re: hard to imagine why there isn't an alert for high CRC and packet loss

Hello,

 

Just wanted to step in and quickly introduce myself as a member of the MS Product Management team. We hear you, thank you for the candid feedback! Absolutely understand the need for email alerts for issues such as CRC errors that can cause network performance issues.

 

Serviceability and logging improvements is a major focus area for us. Over the last year, you might have noticed several improvements in this area. Some examples below:

- Native VLAN mismatch detection

- STP Anomaly detection

- UDLD alerts

- Critical temperature alerts

 

While I don't have an ETA to share with you today, I do want to clarify that CRC error alerting is on our list. We can connect over DM if you've any questions I could help answer. 

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