1 00:00:09,730 --> 00:00:16,600 In this video, I'm going to discuss routed ports on Ethernet switches in this gns3 topology 2 00:00:16,600 --> 00:00:24,030 I have two IOS V layer 2 switches and an IOS V router. 3 00:00:24,190 --> 00:00:27,310 The devices have no configuration. 4 00:00:27,490 --> 00:00:34,520 So they've just booted up and I'll bypass the initial configuration dialog on the router 5 00:00:36,150 --> 00:00:40,470 and let's start by configuring hostnames on the switches 6 00:00:44,320 --> 00:00:54,580 and I'll configure a hostname on the router. So no configuration has been done on these devices at all. 7 00:00:54,580 --> 00:00:59,680 They're using the default configuration and I've simply changed the hostname. 8 00:00:59,680 --> 00:01:07,570 So show CDP neighbors on switch 1 shows me that switch 2 is available on the gigabit 00 interface 9 00:01:08,460 --> 00:01:16,770 CDP was advertising switch 2 with the name switch until I changed it. On switch 2 show CDP neighbor. 10 00:01:16,900 --> 00:01:21,520 We can see switch 1 connected to Gigabit 00. 11 00:01:21,520 --> 00:01:29,380 We don't see the router on gigabit 01 because the routers interfaces are shut down by default, show 12 00:01:29,830 --> 00:01:35,390 interface gigabit 00 switch port. 13 00:01:35,430 --> 00:01:36,630 Here's the command. 14 00:01:36,760 --> 00:01:40,970 We can see that the interface is enabled as a switch port. 15 00:01:41,010 --> 00:01:51,070 It's using dynamic auto DTP mode or dynamic trunking protocol mode the VLAN that the port belongs 16 00:01:51,070 --> 00:01:58,100 to is VLAN 1 because it wasn't able to negotiate trunking with switch 2. 17 00:01:58,150 --> 00:02:00,520 There are no trunk's configured on the switch. 18 00:02:00,940 --> 00:02:07,690 So show interface gigabit switch port, we can see that it's a static access port negotiation of 19 00:02:07,690 --> 00:02:13,680 trunking is enabled but it hasn't negotiated trunking with the other side. 20 00:02:14,410 --> 00:02:19,700 The interface belongs to VLAN 1 on switch 2 21 00:02:19,720 --> 00:02:21,090 we would see something similar. 22 00:02:21,100 --> 00:02:24,590 So show interface gigabit 00 switch port. 23 00:02:24,730 --> 00:02:31,800 The interface is enabled as a switch port using dynamic auto mode. 24 00:02:31,840 --> 00:02:42,280 So when we look at the VLANs at the moment only VLAN 1 and the other default VLANS are configured 25 00:02:42,490 --> 00:02:44,260 on the switches. 26 00:02:44,260 --> 00:02:49,340 We're not going to worry about FTDI and Token Ring in these videos. 27 00:02:49,680 --> 00:02:58,090 What I could do is create a switch virtual interface or SVI you do that by using the interface VLAN 28 00:02:58,130 --> 00:03:01,940 command, we can see that the interface has gone down. 29 00:03:02,450 --> 00:03:09,640 But what I could do is configure an IP address on this interface and then no shut it. 30 00:03:09,650 --> 00:03:18,010 I could then also do something similar create an SVI or switch to a virtual interface for VLAN 31 00:03:18,010 --> 00:03:18,520 1 32 00:03:21,160 --> 00:03:30,670 and give the switch an IP address and no shut the SVI. Interfaces come up on both sides. 33 00:03:30,670 --> 00:03:39,610 So we should be able to ping switch 2 from switch 1 there's the ping again and we should be able 34 00:03:39,610 --> 00:03:44,120 to ping switch 1 from switch 2. 35 00:03:44,140 --> 00:03:53,770 So the physical interface is a layer 2 interface gigabit 00 is enabled as a switch port interface. 36 00:03:53,770 --> 00:03:59,920 It's a layer 2 interface it supports protocols such as spanning tree. 37 00:04:00,070 --> 00:04:07,960 Notice this port is the root port on switch 2 and it's forwarding, show spending tree here shows that 38 00:04:08,000 --> 00:04:16,480 gigabit 00 is the designated port on this switch and it's also forwarding protocols such as DTP and spanning 39 00:04:16,480 --> 00:04:21,440 tree run across switch ports or layer 2 ports 40 00:04:21,480 --> 00:04:32,880 But what I could do as an example on switch 2 is make the port a routed port by using the command no 41 00:04:32,910 --> 00:04:40,830 switch port interfaces come up and now when we type the show interface gigabit 00 switch port 42 00:04:40,890 --> 00:04:49,200 notice we're told that the switch port is disabled. Whereas on this side it's still enabled as a switch 43 00:04:49,200 --> 00:04:54,210 port and we can see the access VLAN that the port belongs to. 44 00:04:54,570 --> 00:04:57,240 We'll also be able to see whether it becomes a trunk 45 00:04:57,660 --> 00:05:00,890 but that's not true on a routed port. 46 00:05:00,900 --> 00:05:08,860 Another difference between a routed port and a switch port is you can configure an IP address directly 47 00:05:09,340 --> 00:05:11,120 on the interface. 48 00:05:11,140 --> 00:05:14,580 Do show run interface gigabit 00. 49 00:05:15,010 --> 00:05:23,150 Notice it's disabled as a switch port and an IP address has been configured directly on the interface. 50 00:05:23,500 --> 00:05:32,320 Whereas if I try that here and try and configure an IP address it's not recognized. 51 00:05:32,350 --> 00:05:37,260 So at this point, I'll just change that IP address to make it consistent 52 00:05:37,930 --> 00:05:39,980 because this is switch 2. 53 00:05:40,400 --> 00:05:50,020 But notice the IP address command is not available on this side because it's currently a switch port. 54 00:05:50,530 --> 00:06:00,300 But if I type no switch port and then IP address notice I can configure the IP address on the interface 55 00:06:00,930 --> 00:06:09,850 do show interface gigabit 00 switch port it is disabled as a switch port. 56 00:06:10,190 --> 00:06:16,640 But I can ping switch 2 through that interface. 57 00:06:16,640 --> 00:06:27,570 So shows spanning tree notice spanning tree is not enabled on gigabit 00 previously gigabit 00 was a 58 00:06:27,570 --> 00:06:29,130 designated port. 59 00:06:29,370 --> 00:06:38,910 But now it's not shown in the output because spanning tree and dynamic trunk protocol do not run on 60 00:06:38,910 --> 00:06:40,150 routed ports. 61 00:06:40,170 --> 00:06:48,630 Gigabit 00 does also not appear on this side, show run interface gigabit 00 62 00:06:48,660 --> 00:06:52,360 shows us that an IP address is configured on the interface. 63 00:06:52,410 --> 00:07:00,070 If I enable this port as a switch port and look at the running config of that interface again. 64 00:07:00,150 --> 00:07:07,390 Notice the IP address has been removed and spanning tree is running on that interface 65 00:07:07,410 --> 00:07:19,020 once again. So interface gigabit00 no switch port IP address 10 122 66 00:07:23,170 --> 00:07:33,400 shows spanning tree, spanning tree is not running on gigabit 00 and I should be able to ping switch 1. 67 00:07:33,730 --> 00:07:42,190 So show IP interface brief shows us that this interface has an IP address configured on it whereas this 68 00:07:42,190 --> 00:07:50,410 interface is a layer 2 interface and the SVI or switch virtual interface is used as the layer 69 00:07:50,410 --> 00:08:00,070 3 interface. So show VLAN brief notice gigabit 00 is not in the list of interfaces that belonged 70 00:08:00,070 --> 00:08:03,160 to VLAN 1, this interface 71 00:08:03,220 --> 00:08:13,680 Gigabit 01 is a layer 2 interface and belongs to VLAN 1 and has this as it's layer 3 IP address. 72 00:08:13,680 --> 00:08:24,780 So basically when you type no switch port you're turning that interface into a routed interface so it 73 00:08:24,840 --> 00:08:27,540 acts like a router. 74 00:08:28,970 --> 00:08:31,080 So gigabit 01 now 75 00:08:31,260 --> 00:08:39,260 is configured as a routed interface and on a router we will do something similar 76 00:08:39,289 --> 00:08:46,580 no shut the interface and configure an IP address directly on the interface and we should be able to 77 00:08:46,580 --> 00:08:53,520 ping switch 2 through that routed interface which we can. 78 00:08:53,900 --> 00:08:58,930 We could also enable a routing protocol. 79 00:08:59,300 --> 00:09:11,820 So I'll enable EIGRP on all interfaces could do the same here router EIGRP 1 and enable EIGRP 80 00:09:11,850 --> 00:09:20,000 on all interfaces. So show IP EIGRP interfaces its enabled in all interfaces and the neighbor relationship 81 00:09:20,000 --> 00:09:21,360 has been established. 82 00:09:21,620 --> 00:09:28,490 Show IP EIGRP neighbor, the neighbor relationship is established on the gigabit 01 interface not on 83 00:09:28,490 --> 00:09:42,830 the SVI but once again if we changed gigabit 00 to a switch port and then enabled EIGRP on this side 84 00:09:42,880 --> 00:09:46,850 notice the difference in the neighbor relationships. 85 00:09:47,070 --> 00:09:55,470 So show IP EIGRP neighbor, no neighbor relationship is established because I need to make this a switch 86 00:09:55,470 --> 00:10:00,820 port to put them back in the same subnet. 87 00:10:01,000 --> 00:10:08,470 So let's check our pings, can router 2 ping router 1 at the moment it can't and that's probably because 88 00:10:08,470 --> 00:10:10,340 of spanning tree. 89 00:10:10,500 --> 00:10:12,770 Notice that port is learning. 90 00:10:12,810 --> 00:10:20,440 So we've got to wait for spanning tree to converge before the EIGRP can form a neighbor relationship. 91 00:10:20,640 --> 00:10:30,210 Routed ports however don't use spanning tree so they will converge quicker than a spanning tree port will. 92 00:10:30,520 --> 00:10:33,490 So the convergence has just taken place. 93 00:10:33,730 --> 00:10:35,870 EIGRP neighbor relationship is established. 94 00:10:35,890 --> 00:10:37,580 So show IP EIGRP 95 00:10:37,580 --> 00:10:40,680 neighbor notice the difference. 96 00:10:40,680 --> 00:10:49,340 This neighbor which is switch 1 has been learnt on VLAN 1 whereas the router has been learnt on the gigabit 97 00:10:49,380 --> 00:10:55,830 01 interface. So show run interface gigabit 00 and 01 98 00:10:55,840 --> 00:11:03,910 notice the difference switch port is enabled on gigabit 00 no switch port has been configured on gigabit 99 00:11:03,950 --> 00:11:08,190 01 when we ping from switch 2 to switch 1 100 00:11:08,210 --> 00:11:19,120 we're using the SVI interface but when we ping from switch 2 to router 1 we're using the physical interface. 101 00:11:19,410 --> 00:11:25,370 So routed ports are typically used between switches and routers for example where a router connects 102 00:11:25,370 --> 00:11:32,870 you to the Internet, switched of virtual interfaces and switch port interfaces are typically used in 103 00:11:32,870 --> 00:11:41,270 a campus environment where you need to tag multiple VLANs across an interface a routed port doesn't 104 00:11:41,270 --> 00:11:48,320 have the concept of VLANs there are no VLANs you don't run spanning tree and you don't run DTP or 105 00:11:48,320 --> 00:11:50,110 dynamic trunk protocol. 106 00:11:50,180 --> 00:11:55,580 The port is a routed port in the same way that you configure a routed port on a router. 107 00:11:55,940 --> 00:11:58,700 So again show IP EIGRP neighbor. 108 00:11:58,970 --> 00:12:03,910 Notice the difference in how the neighbor relationships are formed. 109 00:12:03,910 --> 00:12:07,540 I hope you found this video useful if it's been of benefit to you. 110 00:12:07,610 --> 00:12:11,650 Please like it, please subscribe to my YouTube channel. 111 00:12:11,660 --> 00:12:13,180 I wish you all the very best.