5-48 Motorola RF Switch System Reference
• A full mesh of GRE tunnels can be established between mobility peers. Each tunnel is between a pair of
switches and can handle data traffic for all MUs (for all VLANs) associated directly or indirectly with the
MU.
• Data traffic for roamed MUs is tunneled between switches by encapsulating the entire Layer 2 packet
inside GRE with a proprietary code-point.
• When MUs roam within the same VLAN (Layer 2 Roaming), the behavior is retained by re-homing the MU
to the new switch so extra hops are avoided while forwarding data traffic.
• MUs can be assigned IP addresses statically or dynamically.
• Forward and reverse data paths for traffic originating from and destined to MUs that have roamed from
one Layer 3 subnet to another are symmetric.
To configure Layer 3 Mobility for the switch:
1. Select Services > Layer 3 Mobility from the main menu tree.
The Layer 3 Mobility screen appears with the Configuration tab displayed.
2. Select the Use Default Management Interface checkbox to use the switch’s default management
interface IP address for MUs roaming amongst different Layer 3 subnets. The IP address displayed to the
right of the checkbox is used by Layer 3 MU traffic.
3. If wanting to use a local IP addresses (non switch management interface) for MUs roaming amongst
different Layer 3 subnets, select the Use this Local Address checkbox and enter an IP address.
4. Use the Roam Interval to define maximum length of time MUs within selected WLAN are allowed to
roam amongst different subnets.
5. Refer to the table of WLANs and select the checkboxes of those WLANs you wish to enable Layer 3
mobility for.
Once the settings are applied, MUs within these WLANs can roam amongst different subnets.
NOTE: When using Layer 3 Mobility ensure that TCP traffic on port 58788 is allowed on
the network(s) where mobile units will be roaming from and to.
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