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Cisco Software-Defined Wide Area Network (SD-WAN) provides a highly scalable, resilient, and secure network infrastructure. With advanced security features built into the solution, automation, centralized management, and monitoring, Cisco SD-WAN enables you to control your network through a single dashboard, reduce operating costs, and ensure the best possible experience for your users in local applications or on the cloud.
In this event, the experts will help you understand how Cisco SD-WAN is designed and its main benefits.
They will explore everything from the basic solution design, which license to choose, or which router to select, to overall design and deployment best practices. vManage allows you to configure devices, templates, security / control policies and much more... What if, for some reason, vManage fails? We will help you master an understanding of the policy framework and common troubleshooting tools and learn from programmatic methods to create backups in the SD-WAN environment.
This event is for Cisco SD-WAN beginners and advanced professionals.
To participate in this event, please use the button below to ask your questions
Ask questions from Monday, March 8 to Friday, March 19, 2021
Hi Jean Marie,
Cisco ACI release 4.1(1) adds support for WAN SLA policies. This feature enables tenant administrators to apply preconfigured policies to specify the levels of packet loss, jitter, and latency for tenant traffic over the WAN. When a WAN SLA policy is applied to tenant traffic, the Cisco APIC sends the configured policies to a Cisco vSmart Controller. The Cisco vSmart Controller, which is configured in Cisco ACI as an external device manager that provides Cisco IOS XE SD-WAN capabilities, chooses the best possible WAN link that meets the loss, jitter, and latency parameters specified in the SLA policy. The WAN SLA policies are applied to tenant traffic though contracts.
As an example of where this feature can be useful, consider a deployment in which branches connect to a data center over a WAN using multiple transport technologies, such as MPLS, internet, and 4G. In such deployments, there can be multiple paths between the branches and data centers. This feature provides optimized path selection in these situations based on application groups and SLA.
Cisco APIC release 4.2(1) adds support for enabling returning traffic from a remote site that is destined for the ACI data center to receive differentiated services over the WAN. After the tenant admin registers the Cisco APIC to vManage, the Cisco APIC pulls the WAN-SLA policies and the WAN-VPN from vManage. Then, the Cisco APIC assigns DSCP to each WAN-SLA policy and pushes a prefix list. The prefix list, which is taken from the EPG if the contract between this EPG and L3Out has WAN-SLA configured, enables quality of service on the returning traffic. The WAN-SLA policy and WAN-VPN are both available in the tenant common. Tenant admins map the WAN-VPNs to VRFs on remote sites.
First, keep in mind that TCP is a bidirectional protocol and operates only when connection-initiation messages (SYNs) are acknowledged by ACK messages in a timely fashion. Cisco SD-WAN has a built-in TCP Optimization feature that allows us to fine tune the processing of TCP data traffic, thus decreasing round-trip latency and improving throughput.
With TCP optimization, a router acts as a TCP proxy between a client that is initiating a TCP flow and a server that is listening for a TCP flow, as illustrated in the following figure:
When we enable TCP optimization on the two routers above, Router A terminates the TCP connection from the client and establishes a TCP connection with Router B. Router B then establishes a TCP connection to the server. The two routers cache the TCP traffic in their buffers to ensure that the traffic from the client reaches the server without allowing the TCP connection to time out.
OMP is a protocol used exclusively on the Control Plane, that is, it propagates routes, policies, TLOCs. It will not be used to transport or encapsulate data traffic. In the Data Plane we will have encapsulation with IPsec or GRE (IPsec is used by default) and in this case, yes, there is an overhead that needs to be taken into account. Bear in mind that we have BFD sessions established between SD-WAN routers over the transport tunnels. BFD will be used for link failure detection, measuring of latency, loss and other statistics used by application-aware routing. BFD will also assist in the PMTU Discovery process in each of the available transports.
Thank you svemulap!
In addition to that, the environment continues to operate normally, based on the latest OMP information. This is valid both on the vSmart side and on the WAN Edges side. By default, OMP information is kept in cache for 12 hours and this can be changed by tuning an option called "OMP Graceful Restart".
There are routers for each requirement, you can check general list here: https://www.cisco.com/c/en/us/products/collateral/software/one-wan-subscription/guide-c07-740642.html
Hope it helps, regards.