Overview of the Cisco WMIC
Understanding the Cisco Mobile Wireless Network
5
Cisco 3200 Series Wireless MIC Software Configuration Guide
Figure 4
Example Mobile Unit Configuration
Data Path Example
The wired and wireless devices in the mobile unit are not
aware
that they are mobile. When they must
communicate with another node in the network, they send the request to their default gateway, the
Cisco 3200 Series router. The Cisco 3200 Series router builds a modem over IP (MoIP) tunnel to its
home agent, encapsulating the data packets.
When the Cisco 3200 Series router sends traffic over the wireless link, the MoIP tunnel goes from the
local foreign agent to a local aggregation point and through the backhaul link to the home agent where
the encapsulation is removed from the data packets.
If the mobile router is out of the wireless coverage area and a cellular technology is used to complete the
connection to the home agent, the Mobile IP tunnel is built across the service provider network and into
the home agent. The mobile router chooses a wireless link, depending on the following factors:
•
Which link is up (and available for use)
•
Priority set on each interface
•
Bandwidth
•
IP address
Regardless of which link is up, all traffic from the mobile devices travel through the MoIP tunnel to the
home agent, where it is routed to its destination.
Call Setup Process
This section describes the processes of call setup and data flow as the Cisco 3200 Series router moves
into the vicinity of the hot spot and exchanges data packets.
1.
Association between the workgroup bridge in the vehicle and the root device at the intersection is
initiated.
2.
Once associated, the root device blocks all traffic from the associated workgroup bridge.
3.
The root device forwards an authentication request and authentication credentials supplied by the
workgroup bridge to an authentication, authorization, and accounting (AAA) server.
Cisco 3200 Mobile Access
Router
127851
WLAN
coverage
WMIC
WGB
WMIC
AP
Client PC
WLAN
Serial 1/0
IP camera
Cellular
modem
WLAN
VLAN 1
VLAN 1
VLAN 2
VLAN 2
VLAN 1
VLAN 2
802.11
Содержание 3200 Series
Страница 14: ...xiv Cisco 3200 Series Wireless MIC Software Configuration Guide OL 6415 04 ...
Страница 120: ...Administering the WMIC Managing the System Time and Date 56 Cisco 3200 Series Wireless MIC Software Configuration Guide ...
Страница 136: ...Dynamic Frequency Selection Additional Information 6 Radio Channels and Transmit Frequencies OL 11491 03 ...
Страница 254: ...WIMIC Troubleshooting Error and Event Messages 12 Cisco 3200 Series Wireless MIC Software Configuration Guide ...
Страница 272: ...Supported MIBs Using FTP to Access the MIB Files 4 Cisco 3200 Series Wireless MIC Software Configuration Guide ...
Страница 314: ...Index IN 12 Cisco 3200 Series Wireless MIC Software Configuration Guide OL 6415 04 ...