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5 - 52 WiNG 4.4 Switch System Reference Guide
5.5.3 Reviewing Layer 3 Peer List Statistics
When a MU roams to a current switch on the same layer 3 network, it sends a L2-ROAM message to the home switch to
indicate the MU has roamed within the same VLAN. The old home switch forwards the information to all its peers. The
MU is basically re-synchronized to the new current switch, but keeps its old IP address. The same procedure is followed,
even if the new current switch is on a different layer 3 subnet, but uses the same VLAN ID (overlapping VLAN scenario).
Tracking these message counts is important to gauge the behavior within the mobility domain.The Layer 3 Mobility screen
contains a tab dedicated to tracking the message sent between the current switch, home switch and MU.
To view layer 3 peer statistics
1. Select
Services
The
Layer 3 Mobility
2. Select the
Peer Statistics
3. Refer to the following information within the Peer Statistics tab:
Peer IP
JOIN Events
sent/rcvd
>
Layer 3 Mobility
from the main menu tree.
screen appears with the Configuration tab displayed.
tab.
Displays the IP addresses of the peer switches 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 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.
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Troubleshooting
