1 00:00:00,720 --> 00:00:08,730 In this section we will talk about Cisco software defined access model Cisco software defined access 2 00:00:08,730 --> 00:00:16,890 creates an entirely new way to build campus local area networks as compared with data additional methods 3 00:00:16,950 --> 00:00:23,580 of networking in the middle of 2000 and 10 Cisco set to about to array. 4 00:00:23,660 --> 00:00:29,890 Imagine campus networking with software defined access as the result guys. 5 00:00:30,060 --> 00:00:39,060 Software Defined access uses the software defined architectural module with EQ controller and various 6 00:00:39,150 --> 00:00:41,090 AP eyes. 7 00:00:41,160 --> 00:00:50,010 It still uses a physical network with switches and routers cables and various endpoints also at the 8 00:00:50,010 --> 00:00:50,950 center. 9 00:00:50,960 --> 00:00:59,970 Since the digital network architecture which is DNA Center controller with human users making use of 10 00:01:00,000 --> 00:01:11,130 a graphical user interface and automation using API as in shard DNA center is the controller for software 11 00:01:11,130 --> 00:01:13,460 defined access networks. 12 00:01:13,860 --> 00:01:24,120 Architecturally the southbound side of the controller contains the fabric underlay and the overlay by 13 00:01:24,120 --> 00:01:24,920 design. 14 00:01:24,920 --> 00:01:35,580 SD and implementations most of the interesting new capabilities or care on the northbound side so let's 15 00:01:35,580 --> 00:01:44,790 talk about the fabric underlay and the overlay terms which are the important terms for Cisco's software 16 00:01:44,790 --> 00:01:46,770 defined access. 17 00:01:46,830 --> 00:01:55,260 Let's start with the overlay overlay is the mechanisms to create weeks Len tunnels between software 18 00:01:55,260 --> 00:02:04,020 defined access switches which are then used to transport traffic from one fabric end point to another 19 00:02:04,110 --> 00:02:14,960 over the fabric underlay is the network of devices and connections to provide IP connectivity all nodes 20 00:02:15,020 --> 00:02:23,210 in their fabric with a goal to support the dynamic discovery of all software defined access devices 21 00:02:23,540 --> 00:02:28,880 and end points as a part of the process to create overlay. 22 00:02:29,080 --> 00:02:39,270 We x land tunnels and when it comes to fabric fabric is the combination of the overlay and underlay 23 00:02:39,270 --> 00:02:47,790 which together provide all features to deliver data across the network with the desired features and 24 00:02:47,910 --> 00:02:57,480 attributes in less formal terms guys the underlay exists as a multilayer switches and they are links 25 00:02:57,480 --> 00:03:07,170 with IP connectivity but for a special purpose the underlay supports some new concepts with at tunneling 26 00:03:07,230 --> 00:03:18,270 method called weak land traffic sent by the end point to flows through weeks land tunnels in the overlay 27 00:03:18,690 --> 00:03:28,110 a completely different process than through additional land switching and the IP routing for instance. 28 00:03:28,110 --> 00:03:38,070 Think about the idea of sending packets from hosts on the left of a network over the software defined 29 00:03:38,100 --> 00:03:48,360 access to hosts on the right of the network for instance guys let's imagine a packet enters on the left 30 00:03:48,360 --> 00:03:57,900 side of the physical network and eventually exits the campus out of the switch that you can see in here 31 00:03:57,900 --> 00:04:00,990 from switched to OK. 32 00:04:01,020 --> 00:04:08,790 This underlying network looks like a more traditional network droving with several devices and links 33 00:04:08,790 --> 00:04:09,760 right. 34 00:04:10,020 --> 00:04:19,830 But when you check the figure at the top of the screen which is showing only two switches called Fabric 35 00:04:19,860 --> 00:04:28,080 edge notes because they happen to be at the edges of the software defined access fabric with at tunnel 36 00:04:28,150 --> 00:04:33,380 LaBolt weeks lan connecting the two both concepts. 37 00:04:33,420 --> 00:04:41,700 I mean the underlay and overlaid together create an S the a software defined access fabric.