An enterprise designer should consider design options in deploying SD-WAN components to account for scalability, high availability, security, and QoS. Control Plane Design SD-WAN vManage, vSmart, and vBond can be deployed in one of three cloud-delivered control methods. The design option chosen depends on the company’s IT policies on network infrastructure. A company might want… Read More »
SD-WAN provides network/headend redundancy so that in the event of loss of connectivity via the primary network headend vEdge router at the data center, the vEdge router can connect to a redundant headend vEdge router (see Figure 11-6). Figure 11-6 Network/Headend Redundancy Controller Redundancy As mentioned previously, you can increase the number of vSmart controllers… Read More »
vEdge routers can be configured to provide DHCP server functionality to allow for host IP address assignments to be made directly from a vEdge device on a customer site. DHCP servers are configurable for the service side interface. DHCP relay (IP helper) functionality is also supported for forwarding requests from the service side network to… Read More »
Each VPN is independent of every other VPN. You might separate VPNs in order to separate business traffic from guest wireless traffic. Or you might want to separate manufacturing or extranet traffic. Some traffic might be site-to-site traffic, and other traffic might be site-to-data center traffic. VPNs can be configured with several different topologies: Figure… Read More »
Policies can be configured to influence the flow of traffic in the overlay network. Policies can be control plane or data plane policies, and they can be configured centrally on the vSmart controller or locally on the vEdge routers. Centralized control policies operate on the routing and TLOC information and allow for customization of routing… Read More »
Each vEdge interface has eight queues. Of these queues, queue 0 uses LLQ. By default, control and BFD traffic use queue 0. Control and BFD traffic is marked as DSCP 48 decimal. LLQ traffic is transmitted before packets in any of the other queues. The only congestion-avoidance algorithm used for this queue is tail drop,… Read More »
Benefits of Cisco SD-WAN Cloud OnRamp include Cisco SD-WAN Cloud OnRamp Solutions Cisco SD-WAN Cloud OnRamp solutions include Cisco SD-WAN Cloud OnRamp for Multicloud automates and seamlessly connects enterprise networks to the leading public clouds such as Amazon Web Services (AWS), Google Cloud, and Microsoft Azure and other Infrastructure-as-a-Service (IaaS) providers with site-to-cloud connectivity (see… Read More »
Application programming interfaces (APIs) are simply interfaces for software systems to talk to one another. An API has a set of requirements that describe how applications can communicate between themselves. For years, users have been communicating with applications through user interfaces (UIs) by viewing information and requesting data from the application. APIs come into play… Read More »
As systems communicate with each other, there needs to be a structure behind what is communicated. Simple formatted text that is presented with show commands on a Cisco device will not work. However, systems can easily parse and work with data that is encoded in XML and JSON formats. JSON JavaScript Object Notation (JSON) is… Read More »
Web browsers use REST to get and post information to web servers or other systems that use HTTP. The same HTTP request methods and response codes are used. Figure 12-4 shows a create, retrieve, update, and delete (CRUD) example with a client using HTTP POST, GET, PUT, and DELETE calls along with the response codes… Read More »