Extreme Networks Summit WM3000 Series Reference Manual page 289

3 Refer to the following information within the Peer Statistics tab:
Peer IP
JOIN Events
sent/rcvd
LEAVE Events
sent/rcvd
Summit WM3000 Series Controller System Reference Guide
Displays the IP addresses of the peer controllers within the mobility
domain. Each peer can support up to 500 MUs.
Displays the number of JOIN messages sent and received. JOIN messages
advertise the presence of MUs entering the mobility domain for the first
time. When a MU (currently not present in the MU database) associates
with a controller, it immediately sends a JOIN message to the host
controller with MAC, VLAN and IP information (both current and home
controller IP info). The home controller forwards the JOIN to all its peers
(except the one from which it received the original message). JOIN
messages are always originated by the current controller. JOIN messages
are also used during the home controller selection phase to inform a
candidate home controller about a MU. The current controller selects the
home controller (based on its local selection mechanism) and sends a
JOIN message to the home controller that is forwarded it to all its peers.
Displays the number of LEAVE messages sent and received. LEAVE
messages are sent when the controller decides a MU originally present in
the MU database is no longer present in the mobility domain. The
criterion to determine the MU has actually left the network is
implementation specific. The current controller sends the LEAVE message
with the MU's MAC address information to the home controller, which
eventually forwards the message to each mobility peer.
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