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In this section we will talk about Cisco software defined access model Cisco software defined access
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creates an entirely new way to build campus local area networks as compared with data additional methods
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of networking in the middle of 2000 and 10 Cisco set to about to array.
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Imagine campus networking with software defined access as the result guys.
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Software Defined access uses the software defined architectural module with EQ controller and various
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AP eyes.
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It still uses a physical network with switches and routers cables and various endpoints also at the
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center.
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Since the digital network architecture which is DNA Center controller with human users making use of
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a graphical user interface and automation using API as in shard DNA center is the controller for software
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defined access networks.
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Architecturally the southbound side of the controller contains the fabric underlay and the overlay by
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design.
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SD and implementations most of the interesting new capabilities or care on the northbound side so let's
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talk about the fabric underlay and the overlay terms which are the important terms for Cisco's software
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defined access.
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Let's start with the overlay overlay is the mechanisms to create weeks Len tunnels between software
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defined access switches which are then used to transport traffic from one fabric end point to another
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over the fabric underlay is the network of devices and connections to provide IP connectivity all nodes
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in their fabric with a goal to support the dynamic discovery of all software defined access devices
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and end points as a part of the process to create overlay.
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We x land tunnels and when it comes to fabric fabric is the combination of the overlay and underlay
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which together provide all features to deliver data across the network with the desired features and
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attributes in less formal terms guys the underlay exists as a multilayer switches and they are links
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with IP connectivity but for a special purpose the underlay supports some new concepts with at tunneling
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method called weak land traffic sent by the end point to flows through weeks land tunnels in the overlay
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a completely different process than through additional land switching and the IP routing for instance.
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Think about the idea of sending packets from hosts on the left of a network over the software defined
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access to hosts on the right of the network for instance guys let's imagine a packet enters on the left
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side of the physical network and eventually exits the campus out of the switch that you can see in here
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from switched to OK.
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This underlying network looks like a more traditional network droving with several devices and links
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right.
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But when you check the figure at the top of the screen which is showing only two switches called Fabric
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edge notes because they happen to be at the edges of the software defined access fabric with at tunnel
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LaBolt weeks lan connecting the two both concepts.
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I mean the underlay and overlaid together create an S the a software defined access fabric.
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