1
00:00:00,820 --> 00:00:07,360
So let's fix this problem between Rata one and 2951.

2
00:00:07,810 --> 00:00:12,640
So on the router, it's currently configured to use a speed of 100.

3
00:00:13,690 --> 00:00:17,710
So I'm going to set the speed to order.

4
00:00:18,700 --> 00:00:21,820
This router doesn't give me the option to set duplex.

5
00:00:22,930 --> 00:00:30,580
So show run interface if zero speed is auto show interface f zero.

6
00:00:32,070 --> 00:00:34,410
Speed is still half duplex.

7
00:00:34,800 --> 00:00:42,720
The router can't negotiate with the switch so once again it moves to a fallback position of ten meg

8
00:00:42,720 --> 00:00:43,710
half duplex.

9
00:00:44,040 --> 00:00:50,580
And this is what has caused a lot of problems in the past because the one side such as the router can't

10
00:00:50,580 --> 00:00:52,380
negotiate with the other side.

11
00:00:52,560 --> 00:00:59,430
It simply moves to the lowest possible speed, which is half duplex, ten megabits per second, whereas

12
00:00:59,430 --> 00:01:01,620
the switch is using full duplex.

13
00:01:02,710 --> 00:01:13,870
So on the switch show run interface, if 0/3 speed is ten duplexes full, let's change that to speed.

14
00:01:15,440 --> 00:01:17,660
Or rather speed auto.

15
00:01:20,180 --> 00:01:21,200
Duplex.

16
00:01:24,470 --> 00:01:25,070
Order.

17
00:01:29,700 --> 00:01:35,940
Show run interface f0/3 no configuration SHO interface F zero.

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00:01:35,940 --> 00:01:36,900
Slash three.

19
00:01:37,970 --> 00:01:45,620
Notice it is now using 100 meg full duplex and on the router.

20
00:01:47,830 --> 00:01:52,270
We are getting 100 meg full duplex, so that's a lot better.

21
00:01:52,980 --> 00:02:00,150
The Radha and the switch have negotiated correctly to use 100 megabits per second full duplex.

22
00:02:01,080 --> 00:02:04,110
So can we ping rather to.

23
00:02:04,840 --> 00:02:05,980
Yes, we can.

24
00:02:06,790 --> 00:02:09,479
Let's do a large ping.

25
00:02:13,710 --> 00:02:15,240
Large data gram size.

26
00:02:17,780 --> 00:02:20,930
Pings are being sent without any problems.

27
00:02:23,000 --> 00:02:30,170
We're not seeing any late collisions at the moment because the speed and duplex have negotiated properly.

28
00:02:30,530 --> 00:02:34,190
This may indicate a problem somewhere else in the network.

29
00:02:36,730 --> 00:02:38,920
But at the moment, everything looks good.

30
00:02:39,190 --> 00:02:41,680
Show interface if zero.

31
00:02:43,120 --> 00:02:49,000
Now we still see a late collisions, but that's because of the previous counters.

32
00:02:49,510 --> 00:02:52,000
So I'm going to clear the counters.

33
00:02:52,730 --> 00:02:59,960
And then do the command show interface f zero again and notice we see zero late collisions.

34
00:03:00,800 --> 00:03:06,860
So when looking at your output, be careful of the information.

35
00:03:06,980 --> 00:03:08,240
Clear counters.

36
00:03:10,290 --> 00:03:13,590
And we could specify a specific interface.

37
00:03:15,370 --> 00:03:20,920
Allows us to clear the counters on that interface so that we see fresh information.

38
00:03:21,250 --> 00:03:23,170
So once again, if we ping.

39
00:03:26,000 --> 00:03:30,110
Ten one one 2000 pings.

40
00:03:31,190 --> 00:03:32,690
Large packet size.

41
00:03:35,040 --> 00:03:36,480
We're sending some traffic.

42
00:03:37,430 --> 00:03:38,450
On this side.

43
00:03:38,450 --> 00:03:40,310
Show interface f zero.

44
00:03:40,310 --> 00:03:41,210
Slash three.

45
00:03:42,880 --> 00:03:46,720
We've got the input errors and CRCs are clear counters.

46
00:03:47,890 --> 00:03:49,360
If 0/3.

47
00:03:51,640 --> 00:03:54,880
We don't see any input errors and crises.

48
00:03:56,010 --> 00:04:00,630
Now, obviously, you need to monitor that over a period of time.

49
00:04:00,720 --> 00:04:04,410
So we're seeing a certain number of packets in and a certain number of packets out.

50
00:04:05,070 --> 00:04:10,170
So traffic is definitely being sent and received under this interface.

51
00:04:10,530 --> 00:04:14,610
We're not seeing any input errors, which is better than what we saw last time.

52
00:04:14,850 --> 00:04:17,850
But you just need to monitor that for a period of time.

53
00:04:18,149 --> 00:04:25,500
On the router show interface f zero, we see the number of packets input, number of packets output.

54
00:04:25,890 --> 00:04:32,400
We have no late collisions at the moment, so that's a lot better than what we saw previously.

55
00:04:32,790 --> 00:04:41,910
Now on the switch, we still seeing another problem with a duplex mismatch to switch to.

56
00:04:45,300 --> 00:04:48,120
So this connection here has a duplex problem.