1
00:00:00,630 --> 00:00:08,310
That would require a telnet client enabled on my PC scrolling down, I can see as an example that the

2
00:00:08,310 --> 00:00:14,610
polling method used for this device is SNMP and the polling interval is 120 seconds.

3
00:00:15,560 --> 00:00:20,900
I can see as an example the interfaces and the state of those interfaces, we can see other information

4
00:00:20,900 --> 00:00:24,600
about the device, including that it was rebooted.

5
00:00:25,580 --> 00:00:30,530
Let's have a look at router 2, so here's router 2,

6
00:00:31,010 --> 00:00:33,890
we can see information about the node once again that it's up, 

7
00:00:34,760 --> 00:00:36,950
we can see that it's being polled with SNMP, 

8
00:00:38,090 --> 00:00:45,590
we can see the interfaces once again, so let's have a look at serial 0/0 in this case, we can

9
00:00:45,590 --> 00:00:50,990
see the utilization isn't very high on this interface because no traffic is being sent and we can see

10
00:00:50,990 --> 00:00:52,040
that the interface is up.

11
00:00:53,000 --> 00:00:53,930
So here's router 2

12
00:00:55,030 --> 00:01:01,600
interface serial 0/0, that's the interface that we're looking at in NPM.

13
00:01:02,320 --> 00:01:04,540
I'll shut this interface down.

14
00:01:04,989 --> 00:01:06,250
Interface has gone down.

15
00:01:06,770 --> 00:01:08,620
I'll click poll and now.

16
00:01:09,650 --> 00:01:16,730
and as you can see, the interface has been shut down, that interface has gone down in Wireshark,

17
00:01:17,600 --> 00:01:25,070
we can see that a message was sent from NPM to the router and the router then responded with information

18
00:01:25,070 --> 00:01:28,960
about the OIDs on the device.

19
00:01:29,810 --> 00:01:31,120
So let's do that again.

20
00:01:32,000 --> 00:01:34,240
What I'll do is restart the capture.

21
00:01:35,090 --> 00:01:39,380
We're going to search for SNMP and I'm going to specify an IP address

22
00:01:40,370 --> 00:01:48,170
10.1.100.2 so we can see requests from the management station and then responses back from the

23
00:01:48,170 --> 00:01:48,620
router.

24
00:01:49,220 --> 00:01:53,270
What I'll do now is no shut the interface, so bring it up.

25
00:01:54,080 --> 00:01:59,540
So I'm bringing up serial 0/0 back in the management interface.

26
00:01:59,840 --> 00:02:07,010
I'll click poll now and notice there are no values for different OIDs

27
00:02:07,760 --> 00:02:14,650
and now responses are coming back from the router, poll again interface is up,

28
00:02:15,080 --> 00:02:16,370
So it was done previously.

29
00:02:16,940 --> 00:02:25,130
So the NPM device is able to retrieve status information of network interfaces by using SNMP.

30
00:02:25,700 --> 00:02:32,600
We can see, for instance, the speed of the interface utilization and other options on the interface

31
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of the router or running within GNS3.