Through the Layer 3 roaming feature, wireless clients can roam between hive members in different subnets and maintain their original IP addresses and existing sessions. You can use the default Layer 3 roaming settings or modify them. Select the check box to make the neighbor Keepalives and roaming cache update options editable.
Neighbor Keepalives
Interval: Set the interval between the Keepalives that neighbors send to each other to indicate their continued presence on the network. The default Keepalive interval is 3600 seconds (1 hour). You can change the interval from 10 to 360,000 seconds (100 hours).
Age out (Number of Missed Keepalives): Set the number of consecutive Keepalives from neighbor A that neighbor B must miss for B to determine that A is gone. Neighbor B then removes A from its list of neighbors. The default is 120 missed Keepalives. You can change the age out value from 2 to 1000.