Switch Services 5-51
3. Refer to the following information within the Peer Statistics tab:
4. Click the Clear Statistics button to remove the data displayed for the selected peer IP address.
5.5.4 Reviewing Layer 3 MU Status
The Layer 3 Mobility MU Status tab displays a set of MU stats for associated MUs within the mobility
domain. Use the MU status information to familiarize yourself with these MUs and their mobility-related
parameters to distinguish new MUs entering the network from existing MUs roaming within the mobility
domain.
To view Layer 3 mobility MU statistics
1. Select Services > Layer 3 Mobility from the main menu tree.
The Layer 3 Mobility screen appears with the Configuration tab displayed.
Peer IP Displays the IP addresses of the peer switches within the mobility domain. Each
peer can support up to 500 MUs.
JOIN Events
sent/rcvd
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 switch,
it immediately sends a JOIN message to the host switch with MAC, VLAN and IP
information (both current and home switch IP info). The home switch 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 switch. JOIN messages are
also used during the home switch selection phase to inform a candidate home
switch about a MU. The current switch selects the home switch (based on its local
selection mechanism) and sends a JOIN message to the home switch that is
forwarded it to all its peers.
LEAVE Events
sent/rcvd
Displays the number of LEAVE messages sent and received. LEAVE messages are
sent when the switch 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 switch sends the
LEAVE message with the MU's MAC address information to the home switch,
which eventually forwards the message to each mobility peer.
L2-ROAMs
sent/rcvd
Displays the number of Layer 2 ROAM messages sent and received. When a MU
roams to a new switch on a different layer 3 network (MU is mapped to a different
VLAN ID), it sends a L3-ROAM message to the home switch with the new IP
information for the current switch it is associated with. The L3-ROAM message is
then forwarded by the home switch to each peer.
L3-ROAMs
sent/rcvd
Displays the number of Layer 3 ROAM messages sent and received. When a MU
roams to a new current switch (on the same layer 3 subnet as the old current
switch), it sends a L2-ROAM message to the old home switch with the new home
switch-IP and current switch-IP information. This L2-ROAM message is then
forwarded by the old home switch to each peer.
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