Cisco Catalyst 3850 - Installation Guidelines

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Figure 8. Hierarchical Roles in Converged Access Deployment
The SPGs should include the mobility agent switches that serve the domain where network users frequently roam.
Intra-SPG roaming does not involve the mobility controller, whereas inter-SPG roaming requires traffic to traverse
the mobility controller.
Converged Access Network Design with Cisco Catalyst 3850 Switch
Figure 9 shows a deployment suitable for a small branch office, with one Cisco Catalyst 3850 Switch serving as
both mobility controller and mobility agent. This deployment supports up to 50 Cisco access points and 2000
clients.