H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 455)

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One fit MP with two radios on the same mesh
As shown in Figure 178 , Radio 1 of MP 1 joins the mesh through the MPP. In this case, only Radio 1 can
provide access for downstream MPs. Radio 2 cannot automatically access the mesh and provide the
mesh service.
Figure 457 Two radios on different meshes
Subway WLAN mesh deployment
In a subway system, control information must be sent to trains to effectively manage trains and provide
various services to passengers.
As shown in
Figure 179 , a subway WLAN mesh solution has fit MPs deployed both on the train and
along the rail, which are managed by the same AC. A train MP continuously scans new rail MPs, and
sets up active/dormant links with the rail MPs with the best signal quality. The active mesh link is used for
data transmission and the dormant mesh link acts as the backup link.
Figure 458 Subway WLAN mesh deployment
H3C developed a proprietary protocol named Mobile Link Switch Protocol (MLSP) to support the subway
WLAN mesh deployment. This protocol is used for high-speed link switch with zero packet loss during
train movement. H3C has adopted new IEEE standard 802.11s as the underlying protocol for link
information and communication between train MP and rail MP. Train MPs are not required to act as
authenticators.
WLAN mesh security
A WLAN network uses air as the communication medium, so it is vulnerable to malicious attacks. In a
mesh network, a wireless connection passes through multiple hops, and a mesh network is also