Vehicle Mounted Modem (Vmm) Deployment Consideration - Motorola WiNG 5.4.2 System Reference Manual

5 - 144 WiNG 5.4.2 Access Point System Reference Guide
Monitor Primary Port Link
Path Method
Preferred Neighbor
Preferred Root
Preferred Interface
NOTE: With this release of Motorola Solutions WiNG software, an AP7161 model
access point can be deployed as a Vehicle Mounted Modem (VMM) to provide wireless
network access to a mobile vehicle (car, train, etc.). A VMM provides layer 2 mobility for
connected devices. VMM does not provide layer 3 services, such as IP mobility. For
VMM deployment considerations, see
Consideration.
8. Select OK to save the changes. Select
rows as needed.

5.2.12.1 Vehicle Mounted Modem (VMM) Deployment Consideration

Mesh Point Configuration
Before defining a VMM configuration (mounting an AP7161 mesh point on a moving vehicle), refer to the following deployment
guidelines to ensure the configuration is optimally effective:
• Disable layer 2 stateful packet inspection from the firewall policy.
• Set the RTS threshold value to 1 on all mesh devices. The default value is 2347. For more information on defining radio
settings, see Access Point Radio
• Use Opportunistic as the rate selection settings for the AP7161 radio The default is Standard. For more information on
defining this settings, see
• Disable Dynamic Chain Selection (radio setting). The default value is enabled. This setting is disabled from the Command
Line Interface (CLI) using the
• Disable A-MPDU Aggregation if the intended vehicular speed is greater than 30 mph. For more information, see
Override Configuration.
Select this option to indicate that this mesh point monitors link on the primary port. If the
link on the primary port becomes unavailable, the mesh network is torn down.
From the drop-down menu, select the method to use for path selection in a mesh network.
The available options are:
• None – Select this to indicate no criteria used in root path selection.
• uniform – Select this to indicate that the path selection method is uniform. When
selected, two paths will be considered equivalent if the average value is the same for
these paths.
• mobile-snr-leaf – Select this if this access point is mounted on a vehicle or a mobile
platform (AP7161 models only). When selected, the path to the route will be selected
based on the Signal To Noise Ratio (SNR) to the neighbor device.
Enter the MAC address of the mesh point device that is the preferred neighbor.
Enter the MAC address of the mesh point root that is the preferred root.
From the drop-down menu, select the interface that is the preferred interface for forming
a mesh network.
Vehicle Mounted Modem (VMM) Deployment
Reset to revert to the last saved configuration. Select
Configuration.
Radio Override Configuration.
dynamic-chain-selection
command, or, in the UI (refer
Delete to remove obsolete
Radio Override Configuration.
Radio