Cisco C3201FESMIC-TP= - 3201 Fast EN Switch Mobile Interface Card Expansion Module Software Configuration Manual page 27

Overview of the Cisco WMIC
Intersection Example
In the Cisco Metro Mobile Architecture, each intersection is equipped with a Cisco 3200 Series router.
An intersections is classified as either a primary intersection or a secondary intersection. A primary
intersection funnels all traffic from surrounding secondary intersections through the backhaul to the core
network. Within each cluster of primary and secondary intersections, typically there are two primary
intersections for diversity.
The Cisco 3200 Series routers at the secondary intersections are connected to all of the network devices
at that intersection, such as a traffic controller and a video camera. In
on the secondary intersections (integrated into the Cisco 3200 Series router). Two of the bridges are
point-to-point links to other primary or secondary intersections in the local service area, and one is a root
device serving mobile units in the area.
Figure 2
Non-root
Intersection to Backhaul Example
Wireless
backhaul
Root
Non-root
Root Non-root
Primary Primary Primary Secondary Secondary Secondary
Root
Understanding the Cisco Mobile Wireless Network
Core backhaul
Two to
fifteen
secondary
routers
Root Non-root
Secondary Secondary Secondary
Root
Cisco 3200 Series Wireless MIC Software Configuration Guide
Figure 2, there are three bridges
Wireless
backhaul
Non-root
Root Non-root
Primary Primary Primary
Root
Root
Root
Root
3