A. mesh hop counts of 4 or fewer
B. RAP implemented with 20 or fewer MAP nodes
C. client access via 802.11a and backhaul with 802.11b/g
D. client access via 802.11b/g and backhaul with 802.11a
E. mesh hop counts of 8 to 4
F. RAP implemented with 20 to 32 MAP nodes
Correct Answer: ABD
Wireless Mesh Design Constraints
When designing and building a wireless mesh network with the 1500 Mesh AP, there are a number of system characteristics to consider. Some of these apply to
the backhaul network design and others to the WLC design:
• Recommended backhaul is 18 Mbps—18 Mbps is chosen as the optimal backhaul rate because it aligns with the maximum WLAN coverage distances of the
MAP; that is, the distance between MAPs using 18 Mbps backhaul should allow for seamless WLAN client coverage between the MAPs. A lower bit rate may allow
a greater distance between 1500 Mesh APs, but there are likely to be gaps in the WLAN client coverage and the capacity of the backhaul network is reduced. An
increased bit rate for the backhaul network either requires more 1500 Mesh APs or results in a reduced SNR between mesh APs, limiting mesh reliability and
interconnection. The wireless mesh backhaul bit rate, like the mesh channel, is set by the RAP.
• Number of backhaul hops should be limited to three to four—The number of hops is recommended to be limited to three to four primarily to maintain sufficient
backhaul throughput, because each mesh AP uses the same radio for transmission and reception of backhaul traffic. This means that throughput is approximately
halved over every hop. For example, the maximum throughput for an 18 Mbps is approximately 10 Mbps for the first hop, 5 Mbps for the second hop, and 2.5
Mbps for the third hop.
• Number of MAPs per RAP—There is no current software limitation of how many MAPs per RAP you can configure. However, it is suggested that you limit this to
20 MAPs per RAP to avoid bottle necks in your mesh.
• Number of APs per controller—The number of APs per controller is determined by the controller capacity.
• Number of controllers—The number of controllers per mobility group is limited to 24.
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