Describes how AppNav-XE distributes traffic and shows an example deployment topology.
The AppNav-XE architecture is a traffic-distribution architecture that
-
directs traffic flows to WAAS devices for WAN optimization,
-
uses class and policy mechanisms to optimize traffic based on sites or applications, and
-
scales to available capacity and provides high availability through WAAS-node utilization and overload monitoring, along with configurable failure and overload policies.
Traffic distribution and availability
AppNav-XE reduces dependency on the intercepting router by distributing traffic among WAAS devices for optimization using a class and policy mechanism. You can use WAAS nodes (WNs) to optimize traffic based on sites and/or applications. The AppNav-XE solution can scale up to available capacity by taking into account WAAS device utilization as it distributes traffic among nodes. The solution provides high availability of optimization capacity by monitoring node overload; and by providing configurable failure and overload policies.
Topology example
-
*SN: Service nodes or WAAS nodes (up to 64)
-
*SC: A Cisco IOS XE Catalyst SD-WAN device acting as a service controller (up to 4)
The image above shows an example of Cisco Catalyst SD-WAN deployment with AppNav-XE. The Cisco IOS XE Catalyst SD-WAN devices at the data center and branches are enabled with the AppNav-XE feature and form an AppNav cluster with WAAS nodes.