Describes the controller and service-node roles in branch and data center TCP optimization topologies.
A TCP optimization topology is a network arrangement that assigns controller and service-node roles to routers.
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For a branch, the Cisco IOS XE Catalyst SD-WAN device acts as both controller and service-node.
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For a data center, the controller and service-node roles are performed by separate Cisco IOS XE Catalyst SD-WAN devices. This optimizes performance and enables handling more traffic.
Service-node connection
The service-node is an external node that has control connections to Cisco SD-WAN Manager to receive configurations.
The service-node Cisco IOS XE Catalyst SD-WAN device must have an underlay connection to the controller on the global VRF to establish an appnav tunnel.
