Understanding Mobility Domains
The Mobility Domain is a virtual grouping of Wireless LAN Controllers (WLCs) that enable roaming and maintain user session information to provide for seamless roaming through identity-based networking. It also provide resiliency and scalability. Common configuration is shared dynamically between all members of the cluster and provides a single point of configuration for all members.
A Mobility Domain enables users to roam geographically across the system while maintaining data sessions and VLAN or subnet membership, including IP address, regardless of connectivity to the network backbone. When users move from one area of a building or campus to another, client associations with servers or other resources do not change. When users access a controller in a Mobility Domain, they become members of the VLAN designated through their authorized identity. If a native VLAN is not present on the accessed controller, the controller forms a tunnel to another controller in the Mobility Domain that includes the native VLAN.
In a Mobility Domain, one controller acts as a primary seed device, and distributes information to all other controllers defined in the Mobility Domain. Otherwise, the seed controller operates as any other Mobility Domain member.
The clustering feature between the controllers ensure smooth mobility across an entire wireless network. With clustering, you can create logical groups of controllers and access points, which share network and user information for continuous and uninterrupted support.