Roaming in WLC

There are 3 types of Roaming

1. Intra Controller
2. Inter Controller
3. Inter Controller - L3

Intra Controller

In intra controller roaming, when client goes from one AP to different AP and both AP is connected in single WLC then only client state & security context will be updated in WLC.

Inter Controller

In inter controller roaming, when client goes from one AP to different AP and other AP is connected in different WLC then client state & security context will be moved in WLC.

Inter Controller - L3

In inter controller - L3 roaming, when client goes from one AP to different AP and other AP is connected in different WLC with different VLAN for WLAN in which the client is connecting then client state & security context will be copied in WLC.

In this scenario, original WLC marks the client entry as Anchor and new WLC marks the client entry as Foreign.

The two WLC is now referred to Anchor WLC and Foreign WLC respectively, client will keep the IP address unchanged and that is the real advantage.