1 00:00:00,487 --> 00:00:09,734 In the previous video, we have created 2 topology like this. Here we have room 1 and here we have room 2. 2 00:00:10,167 --> 00:00:18,481 In the room 1, we have 2 vlan, which is vlan 10 for accounting and vlan 20 for marketing. 3 00:00:18,942 --> 00:00:27,789 In the room 2, we also have same vlan, which is vlan 10 for accounting and vlan 20 for marketing. 4 00:00:28,501 --> 00:00:34,049 Until now, we know that between different vlan can not communicate yet. 5 00:00:34,439 --> 00:00:42,605 So PC in vlan 10 can not communicate with PC in vlan 20. But communication inside 6 00:00:42,605 --> 00:00:50,377 vlan should be ok. Let’s say here PC 1 should be able to communicate with PC 2. 7 00:00:51,000 --> 00:00:55,470 Now the question is, how if two PC in the same vlan, 8 00:00:55,470 --> 00:01:00,257 but in the different room. Can they communicate each others? 9 00:01:00,953 --> 00:01:08,630 For example, here we want to communicate from vlan 10 in the room 1 with vlan 10 in the room 2. 10 00:01:09,909 --> 00:01:19,761 Now let’s try to connecting switch 1 and switch 2. Okay now here room 1 is connected to room 2. 11 00:01:20,671 --> 00:01:27,218 Now let’s try to ping from vlan 10 in room number 1 to vlan 10 in room number 2. 12 00:01:28,205 --> 00:01:33,380 Okay here we can see that the result is failed. Let’s try again, 13 00:01:36,085 --> 00:01:37,917 okay still failed. 14 00:01:38,539 --> 00:01:44,525 Why this is failed? This is because the interface that connecting between switch 15 00:01:44,525 --> 00:01:52,975 is not in the vlan 10. Let’s verify it, enable, and then show vlan brief. 16 00:01:53,881 --> 00:02:02,689 Oh I am sorry, here we can see that fa0/5 and fa0/6 is in the vlan 10, 17 00:02:03,193 --> 00:02:09,617 this is because our configuration in the previous video. Now let’s set this two 18 00:02:09,617 --> 00:02:17,545 interface to the vlan 1 again. Remember that by default, all interface is in the vlan 1. 19 00:02:18,407 --> 00:02:32,387 Conf t, interface range fa0/5-6, switchport access vlan 1. Now let’s verify it, do show vlan brief. 20 00:02:33,457 --> 00:02:42,095 Okay here we can see that fa0/5-6 is in the default vlan, which is vlan 1. 21 00:02:43,551 --> 00:02:46,495 Now let’s see in the switch 2. 22 00:02:49,085 --> 00:02:57,699 Enable, show vlan brief. Here we can see that fa0/5 is in the vlan 1. 23 00:02:58,320 --> 00:03:05,545 This is why vlan 10 in the room 1 and vlan 10 in the room 2 can not communicate each others. 24 00:03:06,083 --> 00:03:11,159 Because interface that connecting this two switch is in the vlan 1, 25 00:03:11,610 --> 00:03:19,764 so vlan 10 can not passing this interface. Because this interface only allow vlan 1 to pass. 26 00:03:20,699 --> 00:03:25,565 Here also same with vlan 20, vlan 20 in the room 1 27 00:03:25,565 --> 00:03:29,893 also can not communicate with vlan 20 in the room 2. 28 00:03:30,525 --> 00:03:37,851 So the question is, how we can communicate between vlan 10 in the room 1 to vlan 10 in room 2? 29 00:03:38,577 --> 00:03:45,993 Here we can assign interface fa0/5 in both of switch to vlan 10. 30 00:03:46,709 --> 00:03:57,138 So here let’s go to interface fa0/5, switchport mode access, and then switchport access vlan 10. 31 00:03:57,871 --> 00:04:08,077 Now let’s verify it, do show vlan brief. Okay here we can see that fa0/5 now is in the vlan 10. 32 00:04:08,802 --> 00:04:17,151 Next let’s configure in the switch 2. Conf t, go to interface fa0/5. 33 00:04:17,916 --> 00:04:23,204 Switchport mode access, and then switchport access vlan 10. 34 00:04:24,000 --> 00:04:35,079 Let’s verify it, do show vlan brief. Okay here we can see that now fa0/5 is in the vlan 10. 35 00:04:35,787 --> 00:04:44,415 Now, vlan 10 in the room 1 should be able to communicate with vlan 10 in room 2. Let’s try it. 36 00:04:46,827 --> 00:04:50,556 Okay here is still failed, let’s try again. 37 00:04:53,387 --> 00:04:56,878 and here we can see that now is successful. 38 00:04:57,440 --> 00:05:05,201 This is because interface between switch is in the vlan 10. So vlan 10 can pass this interface. 39 00:05:05,711 --> 00:05:09,672 But the question is, how about vlan 20? 40 00:05:10,091 --> 00:05:11,260 Let’s try it. 41 00:05:13,980 --> 00:05:21,495 Okay here the result is failed. Why? Because interface between switch now Is in the vlan 10. 42 00:05:21,621 --> 00:05:25,563 Absolutely vlan 20 can not pass this interface. 43 00:05:26,647 --> 00:05:30,738 We can assign the interface between switch to vlan 20, 44 00:05:30,848 --> 00:05:35,079 but vlan 10 will not able to communicate between rooms. 45 00:05:36,000 --> 00:05:39,575 So the solution for this problem is we can 46 00:05:39,575 --> 00:05:46,950 use trunk. We will configure the interface that connecting this two switch become trunk. 47 00:05:47,499 --> 00:05:50,213 If we configure the interface to trunk, 48 00:05:50,480 --> 00:05:58,453 so the interface can pass any packet from any vlan. So vlan 10 can pass the interface, 49 00:05:58,800 --> 00:06:04,523 vlan 20 can pass the interface, and all of vlan can pass the interface. 50 00:06:05,168 --> 00:06:18,605 Let’s try it. Open switch 1, interface fa0/5, and then switchport mode trunk. Okay this is how we 51 00:06:18,605 --> 00:06:26,244 can configure trunk in cisco switch. Easy right? Now let’s move to switch 2, 52 00:06:29,603 --> 00:06:37,298 interface fa0/5, switchport mode trunk. And now Let’s verify, 53 00:06:37,579 --> 00:06:42,644 to verify the trunk, we can use command do show interface trunk 54 00:06:44,083 --> 00:06:50,627 Here we can see that we have trunk interface, which is fa0/5. 55 00:06:51,363 --> 00:06:57,389 Now let’s try to ping from vlan 10 room 1 to vlan 10 room 2. 56 00:06:58,153 --> 00:07:07,577 Okay here we can see that the result is success. Let’s try for vlan 20. Okay here also success. 57 00:07:08,671 --> 00:07:13,931 So now, same vlan between room can communicate each others. 58 00:07:14,140 --> 00:07:22,038 Because we already configure trunk between switch. Okay I think enough for this video. 59 00:07:22,275 --> 00:07:25,655 I hope you understand the function of trunk. 60 00:07:26,059 --> 00:07:29,324 Thankyou for watching and see you on the next video.