Syslog Explained | Cisco CCNA 200-301

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Using a SYSLOG server allows us to centrally manage our log information. Why would you want to do that? Well, there are a few reasons why.

First, Syslog information is very important when troubleshooting problems. Let's say a user reports a network outage. You can go through all of the logs to see if there were any problems at the time the user reported the issue.

Another benefit of storing syslog information in a central place is data retention. Cisco devises, by default, stores log information in RAM. This means, when the device reboots, the logs are erased. Keeping all of your log information in one place allows for easy archiving.

OK, so now we know what a syslog server is and why we use them, let's look at some log messages! It may not seem like it straight away, but these messages follow an industry standard. This makes it easy to correlate logs from different vendors.

- The first part is the timestamp or sequence number. You can choose which one you want to use.

- The next part is called the facility. This shows the source of the message.

- Next, we have the severity. This shows how urgent the log message is.

- Then we have something call the mnemonic, this is a code to identify the message.

- And finally, we have the description, which contains the log message.

Syslog has 8 severity levels ranging from 0-7. The top is the most urgent, severity 0, and the bottom is the least urgent, which is 7 for debug messages. This is important because you likely don’t want to send all syslog messages to your server.

0 Emergency
1 Alert
2 Critical
3 Error
4 Warning
5 Notice
6 Informational
7 Debug

Unfortunately, this is one of those tables you're going to have to memorise for the CCNA exam. You need to know, not only the severity levels but which order they’re in. As with most of these things, mnemonics come to the rescue.

Every Awesome Cisco Engineer Will Need Ice-cream Daily
Ernie Always Cries Even when No one is Dying

#ccna #cisco #networking

[ardentdfender]

Very awesome how you covered this topic. I find the Severity List easier to remember with the ‘Every Awesome Cisco Engineer…..’ wording. That’s easier for me to remember. As well, really appreciate you showing how to capture Syslog info in a free 3rd party tool. I had no idea of that. But the fact that you showed how’s that’s even done was also immensely helpful as it relates to the topic itself.

[liamtingle]

I love the concise nature of the Certbros videos.

[Lashan_]

"good ole 2020" I love your vids, the quality is perfection but I especially appreciate that your personality can be found in each! Thanks for being a genuine teacher

[thoughtsonafricaissuesanal]

This breaks it down and a beginner can follow without problems. Awesome explanation

[idakhoshvaght]

This is a genuine high-quality education. Truly enjoyed it. Thank you so much. I wish you do more prep video certificates such as EMC certificates for storage. Never find any good videos about it on the internet.

[dasguptapratip]

Loved your explanation. I was able to configure my own syslog server post this video.

[pretender]

Just what I'm looking for ! What a great explanation and demo 👍

[briancipriano]

Thank you for the video...It contained the right amount of information and was presented in a clear manner.

[SULAIMANBOCKRIE]

I really likes your tutorials and it has helped me a lot on my CCNA course.❤❤

[ascvb]

Excellent, high production-value explanation. Thanks.

[dougmmm]

Great explanation, loved it. This is superbly instructed. Well done.

[cesarausan]

One more time: Every Awesome Cisco Engineer Will Need Ice Cream Daily -> Emergency, Alert, Critical, Error, Warning, Notice, Information, Debug.

[sorrybabyx]

thanks bro this thing was eating my head lol. Also thanks for the mnemonic!

[kimurayasaki]

keep it up, you did a good job. it is simple and clearly to understand about syslog.

[ashutoshjha]

This was so helpful and easy to understand.

[Sphoe]

Thanks a lot for this video! I really enjoyed it and it was very useful! <3

[olehzaiats]

Thanks for the explanation! Well done!

[MariaGomez-lgug]

Then heart the routers have a syslog server by default because when we configure something the router shows it the same way the switch????

[badrhani]

very nice explanation, thank you for your effort!

[badrhani]

it would be great if you could please update the video of the NAT from 2016 with more explanation skills, Thank you for your effort !