1
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So I change the logging level so logging.

2
00:00:05,480 --> 00:00:19,810
And once again monitor and I'll set this two error messages or errors so show logging Consul is set

3
00:00:19,810 --> 00:00:21,420
to teach debugging.

4
00:00:21,420 --> 00:00:32,500
Monitor is set to errors show debug adjacency debugging is enabled him to face if zero is less than

5
00:00:32,520 --> 00:00:33,680
zero.

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00:00:33,680 --> 00:00:36,090
Shut the interface.

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00:00:36,330 --> 00:00:40,030
We have terminal monitor enabled on our telnet line.

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00:00:40,290 --> 00:00:42,650
No shut.

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00:00:42,740 --> 00:00:51,680
Once again we see debugging on the console but we see nothing on the Viti one lines and that's because

10
00:00:52,400 --> 00:01:01,220
the logging on the console is debugging or Level 7 but the logging on the monitor lines these errors

11
00:01:02,290 --> 00:01:04,020
are Level 3.

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00:01:04,040 --> 00:01:09,460
It's worth knowing both the name and the number.

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00:01:09,460 --> 00:01:17,230
With regards to this log messages now it it's possible to stop all logging to the local cons. If you

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00:01:17,230 --> 00:01:21,900
like and all you would do is type no logging con..

15
00:01:22,180 --> 00:01:27,870
You could do something similar for other options such as the monitor lines.

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00:01:28,150 --> 00:01:31,520
So notice were not typed and nothing happened.

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00:01:31,810 --> 00:01:35,400
Control the control said nothing happened.

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00:01:35,460 --> 00:01:37,330
Show debug.

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00:01:37,790 --> 00:01:40,380
Always be if debugging is enabled.

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00:01:40,390 --> 00:01:45,620
Show logging Consul is disabled.

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00:01:45,890 --> 00:01:51,110
In this case monitoring on the monitor is set to errors.

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00:01:51,110 --> 00:01:58,470
I'll change that to level 7.

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00:01:59,420 --> 00:02:02,770
I've disabled logging on the console.

24
00:02:02,810 --> 00:02:12,550
Notice I don't see output here but I see output on the Viti y line so just to show you that again.

25
00:02:14,960 --> 00:02:24,320
Hit enter a few times via control Z controls it notices see the output on the Viti y line.

26
00:02:24,580 --> 00:02:31,610
But I don't see the output on the console because I've disabled logging on the console all shut the

27
00:02:31,610 --> 00:02:35,650
interface down on the router and then shut it.

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00:02:35,690 --> 00:02:42,920
I see the debugging on the Viti line but I see nothing on the console of the Rodda

29
00:02:46,230 --> 00:02:55,650
So lets enable that again logging console debugging logging monitor debugging show log show logging

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00:02:57,530 --> 00:03:02,910
consul to set back to debugging and the monitor set to debugging.

31
00:03:02,910 --> 00:03:06,010
However in this example the buffer is disabled.

32
00:03:06,180 --> 00:03:15,280
So let's look at enabling logging on the buffer now in this example on Rotto one show logging shows

33
00:03:15,280 --> 00:03:22,390
me that I have logging on the console and logging on the Viti one line but I don't have logging enabled

34
00:03:22,390 --> 00:03:23,590
on the buffer.

35
00:03:23,620 --> 00:03:29,270
Now it's very unlikely that you are going to connect to the console of all your Ratisbon switches and

36
00:03:29,270 --> 00:03:32,610
to view logging messages in real time.

37
00:03:32,740 --> 00:03:39,340
You may do that while troubleshooting an issue but you probably don't want to spend your whole day looking

38
00:03:39,400 --> 00:03:41,380
at console messages.

39
00:03:41,380 --> 00:03:43,820
You would rather have that buffered somewhere.

40
00:03:44,030 --> 00:03:51,370
Even better stored in a central place which you can view off line or view at a later date.

41
00:03:51,370 --> 00:03:57,980
So let's look at Buffer logging first and then we'll look at so SLOC.

42
00:03:58,060 --> 00:04:07,440
So I'll set logging on the console to a low level three areas.

43
00:04:07,630 --> 00:04:12,400
I'll leave it at seven on the VQ Y so that we can see the output.

44
00:04:12,830 --> 00:04:24,900
And I must say logging Bufford and in this case I'll set it to seven or debugging so show log Konsole

45
00:04:25,190 --> 00:04:33,940
is level 3 errors monitor lines in other words in our example of Vitti why you set to debugging and

46
00:04:33,940 --> 00:04:45,380
buffer is set to debugging if on top show log again I see a message in the buffer to see the size of

47
00:04:45,380 --> 00:04:57,700
the buffer so I can change that size by typing logging buffet and I can set the buffer level to a number.

48
00:04:57,700 --> 00:05:07,040
I'll set it to this so show log can see the buffer sizes changed.

49
00:05:07,070 --> 00:05:15,660
Now that will depend on the amount of space that you have available on your router or switch.

50
00:05:15,710 --> 00:05:17,400
So let's do the test again.

51
00:05:17,420 --> 00:05:23,490
Shut the interface and run it to shut it.

52
00:05:23,550 --> 00:05:27,150
I don't see any log messages on the console.

53
00:05:27,240 --> 00:05:36,020
I am seeing them on the Viti y but if I type should log now and scroll down.

54
00:05:36,190 --> 00:05:40,320
Notice I see my OSPF messages in the log.

55
00:05:41,220 --> 00:05:42,960
These were not they.

56
00:05:43,060 --> 00:05:50,090
Previously I could as an example do some filtering so using plute.

57
00:05:50,440 --> 00:06:01,090
And let's look for the word BBR and that'll show me all my log messages in the buffer that include the

58
00:06:01,090 --> 00:06:08,110
key word B-D or it's a lot better and a lot easier to search for specific messages using the buffer

59
00:06:08,530 --> 00:06:14,870
than it would be using the console or a monitor interface such as this.

60
00:06:14,870 --> 00:06:18,780
The problem with buffers is they are limited in size.

61
00:06:18,830 --> 00:06:23,030
You don't have gigs of buffer space available on your routers.

62
00:06:23,150 --> 00:06:28,110
And the problem is if you have 100 routers you're going to end up with a hundred buffers.

63
00:06:28,220 --> 00:06:35,510
It makes a lot more sense to have a centralized syslog server where you collect all the log messages

64
00:06:35,630 --> 00:06:39,260
and stored in a single place that allows for a lot better searching.

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00:06:39,290 --> 00:06:44,090
You can use tools in Windows or Mac as an example to search for log messages.

66
00:06:44,090 --> 00:06:45,540
It can be archived.

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00:06:45,650 --> 00:06:49,860
It's just a lot better to store your log messages on a log server.

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00:06:50,060 --> 00:06:57,280
So let's look at installing the solar wind syslog server and capturing the log messages.