All language subtitles for 4. DTP GNS3 Demo Part 3

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These are the user uploaded subtitles that are being translated: 1 00:00:00,000 --> 00:00:05,000 align:middle line:84% Now on links to devices that don’t support DTP 2 00:00:05,000 --> 00:00:08,000 align:middle line:84% the port will remain an access port 3 00:00:08,000 --> 00:00:11,000 align:middle line:84% so on this link between switch 2 and router 2 4 00:00:11,000 --> 00:00:18,000 align:middle line:84% the default mode is being used which is dynamic auto. 5 00:00:18,000 --> 00:00:21,000 align:middle line:84% so DTP is enabled but it's using dynamic auto. 6 00:00:21,000 --> 00:00:27,000 align:middle line:84% I’ll configure it to use desirable. 7 00:00:27,000 --> 00:00:35,000 align:middle line:84% sh int g0/2 switchport 8 00:00:35,000 --> 00:00:39,000 align:middle line:84% notice the administrative mode is dynamic desirable 9 00:00:39,000 --> 00:00:41,000 align:middle line:84% but the operational mode is static access. 10 00:00:41,000 --> 00:00:49,000 align:middle line:84% So it’s not trunking it's remained as an access port in the default VLAN of 1. 11 00:00:49,000 --> 00:00:53,000 align:middle line:84% and that’s because router 2 isn’t configured to use DTP 12 00:00:53,000 --> 00:00:57,000 align:middle line:84% this interfaces are routed interface 13 00:00:57,000 --> 00:01:00,000 align:middle line:84% so the switch port interface 14 00:01:00,000 --> 00:01:04,000 align:middle line:84% at the moment that interfaces is down, so let’s enable it 15 00:01:04,000 --> 00:01:07,000 align:middle line:84% and see if it makes any difference. 16 00:01:07,000 --> 00:01:16,000 align:middle line:84% But notice if we type the command sh switchport it’s not gonna work 17 00:01:16,000 --> 00:01:25,000 align:middle line:84% sh int f0/0 this is a routed port not a switchport interface. 18 00:01:25,000 --> 00:01:32,000 align:middle line:84% So it’s acting as a PC or traditional router on switch 2 19 00:01:32,000 --> 00:01:36,000 align:middle line:84% sh int g0/2 switchport 20 00:01:36,000 --> 00:01:38,000 align:middle line:84% notice the mode has remained a static access 21 00:01:38,000 --> 00:01:41,000 align:middle line:84% even though it’s configured as desirable 22 00:01:41,000 --> 00:01:46,000 align:middle line:84% that will be true for both dynamic auto and dynamic desirable. 23 00:01:46,000 --> 00:01:51,000 align:middle line:84% Unless both sides can negotiate to use DTP 24 00:01:51,000 --> 00:01:56,000 align:middle line:84% it will just remain an access port in the default VLAN which is VLAN 1. 25 00:01:56,000 --> 00:01:59,000 align:middle line:84% Now let’s look at some negotiation 26 00:01:59,000 --> 00:02:01,000 align:middle line:84% so let’s do some Wireshark captures 27 00:02:01,000 --> 00:02:08,000 align:middle line:84% so I start capturing traffic on the hub, in this case on port 2 28 00:02:08,000 --> 00:02:20,000 align:middle line:84% the switches are using gigabit 0/3, so sh int g0/3 switchport 29 00:02:20,000 --> 00:02:23,000 align:middle line:84% at the moment its configured to use dynamic auto 30 00:02:23,000 --> 00:02:26,000 align:middle line:84% in other words DTP but auto mode. 31 00:02:26,000 --> 00:02:32,000 align:middle line:84% The same is true on switch 2, notice dynamic auto. 32 00:02:32,000 --> 00:02:37,000 align:middle line:84% In the Wireshark captures we see Spanning Tree BPDUs 33 00:02:37,000 --> 00:02:43,000 align:middle line:84% we see some CDP messages and notice here we see dynamic trunk protocol. 34 00:02:43,000 --> 00:02:52,000 align:middle line:84% We can see a message from switch with MAC address ending in cc:03 35 00:02:52,000 --> 00:02:55,000 align:middle line:84% configured for auto access mode 36 00:02:55,000 --> 00:02:59,000 align:middle line:84% sh int g0/3 37 00:02:59,000 --> 00:03:09,000 align:middle line:84% notice this is the Mac address of switch 2 ending in cc:03 38 00:03:09,000 --> 00:03:12,000 align:middle line:84% so in the output, we can see the trunk status 39 00:03:12,000 --> 00:03:16,000 align:middle line:84% values configured for auto access 40 00:03:16,000 --> 00:03:26,000 align:middle line:84% it’s using ISL and the sender ID is switch 2. 41 00:03:26,000 --> 00:03:31,000 align:middle line:84% We can also see a message from switch 1 42 00:03:31,000 --> 00:03:38,000 align:middle line:84% notice MAC address ff0/3 sh int g0/3 43 00:03:38,000 --> 00:03:43,000 align:middle line:84% so there’s the command, notice the MAC address ends in ff0/3. 44 00:03:43,000 --> 00:03:53,000 align:middle line:84% This switch is also using DTP auto access mode scrolling down 45 00:03:53,000 --> 00:03:55,000 align:middle line:84% we can see it wants to negotiate to use ISL 46 00:03:55,000 --> 00:03:59,000 align:middle line:84% and there’s the MAC address of the switch. 47 00:03:59,000 --> 00:04:05,000 align:middle line:84% So at the moment, neither side is initiating trunking. 48 00:04:05,000 --> 00:04:10,000 align:middle line:84% So if we type sh int trunk 49 00:04:10,000 --> 00:04:14,000 align:middle line:84% you’ll notice gigabit 0/3 is not in the list of trunk ports. 50 00:04:14,000 --> 00:04:23,000 align:middle line:84% on either side sh int g0/3 switchport 51 00:04:23,000 --> 00:04:29,000 align:middle line:84% at the moment it’s operating as an access port. 52 00:04:29,000 --> 00:04:42,000 align:middle line:84% We can see that on both sides but if we change 1 side so int g0/3 53 00:04:42,000 --> 00:04:53,000 align:middle line:84% switchport mode dynamic desirable sh int trunk 54 00:04:53,000 --> 00:05:00,000 align:middle line:84% Notice that gigabit 0/3 is configured to use trunking 55 00:05:00,000 --> 00:05:05,000 align:middle line:84% with ISL encapsulation because this side is configured as desirable 56 00:05:05,000 --> 00:05:11,000 align:middle line:84% sh int trunk this side is configured as auto 57 00:05:11,000 --> 00:05:14,000 align:middle line:84% so they’ve negotiated to set up a trunk. 58 00:05:14,000 --> 00:05:19,000 align:middle line:84% In the Wireshark capture, I scroll down. 59 00:05:19,000 --> 00:05:25,000 align:middle line:84% Here we have a message from switch 2 60 00:05:25,000 --> 00:05:28,000 align:middle line:84% notice the mode is trunk desirable. 61 00:05:28,000 --> 00:05:38,000 align:middle line:84% So the switch is initiating the trunking using ISL with switch 1. 62 00:05:38,000 --> 00:05:41,000 align:middle line:84% Switch 1 is still using trunk auto 63 00:05:41,000 --> 00:05:47,000 align:middle line:84% but switch 2 is using dynamic desirable trunking 64 00:05:47,000 --> 00:05:49,000 align:middle line:84% so it’s initiating the trunking. 65 00:05:49,000 --> 00:05:53,000 align:middle line:84% What happens if we change the encapsulation? 66 00:05:53,000 --> 00:05:56,000 align:middle line:84% so int g0/3 67 00:05:56,000 --> 00:06:01,000 align:middle line:84% switchport trunk encapsulation dot1q 68 00:06:01,000 --> 00:06:05,000 align:middle line:84% sh int trunk on the left-hand side 69 00:06:05,000 --> 00:06:08,000 align:middle line:84% notice the trunking is changed to dot1q 70 00:06:08,000 --> 00:06:11,000 align:middle line:84% previously it did negotiate to use ISL. 71 00:06:11,000 --> 00:06:23,000 align:middle line:84% in the Wireshark capture, scrolling up, we should see some messages. 72 00:06:23,000 --> 00:06:29,000 align:middle line:84% Here’s switch 2 trunk desirable. 73 00:06:29,000 --> 00:06:32,000 align:middle line:84% Wanting to use 802.1q rather than ISL. 74 00:06:32,000 --> 00:06:39,000 align:middle line:84% so notice the trunk operating type is 802.1q 75 00:06:39,000 --> 00:06:43,000 align:middle line:84% switch 2 is negotiating switch 1 76 00:06:43,000 --> 00:06:47,000 align:middle line:84% which is still using dynamic auto to set up a trunk 77 00:06:47,000 --> 00:06:49,000 align:middle line:84% and that’s whats happened. 78 00:06:49,000 --> 00:06:52,000 align:middle line:84% Switch 1 is using auto mode 79 00:06:52,000 --> 00:07:01,000 align:middle line:84% but is currently using trunking using 802.1q with switch 2 80 00:07:01,000 --> 00:07:07,000 align:middle line:84% because switch 2 is configured with desirable mode 81 00:07:07,000 --> 00:07:09,000 align:middle line:84% and is initiating the trunk. 82 00:07:09,000 --> 00:07:14,000 align:middle line:84% So there some examples of using dynamic trunking protocol 83 00:07:14,000 --> 00:07:18,000 align:middle line:84% to dynamically configure a trunk between 2 switches. 84 00:07:18,000 --> 00:07:25,000 align:middle line:84% The recommendation once again is don’t use DTP 85 00:07:25,000 --> 00:07:30,000 align:middle line:84% so turn off DTP and manually configure your trunk 86 00:07:30,000 --> 00:07:35,000 align:middle line:84% and your encapsulation between both switches. 9504

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