Cisco Cisco 2000 Series Wireless LAN Controller Livre blanc

requirements on the infrastructure, and in most typical deployments, there is no need to add extra capacity to
the infrastructure in order to accommodate Cisco Unified Wireless Architecture. As a summary of the traffic
study, these quick facts about the operation of LWAPP can be kept in mind:

Although latency is an important consideration, this traffic−study presents throughput considerations
only. As a general guideline, the AP−to−WLC link must not exceed 100ms round−trip latency.

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There are two separate channels for the operation of LWAPP:

LWAPP Data

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LWAPP Control traffic

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LWAPP operation is broken down into two broad categories:

one−time exchanges

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on−going exchanges

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A 20 minute sample that includes initial exchanges results in an average utilization statistic of 0.001
percent.

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A 20 minute sample of on−going exchanges results in a maximum utilization statistic of 0.35
kilobits/second.

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The LWAPP Data channel adds a header of 6 bytes to each 802.11 data packet. There is no additional
overhead for IP Fragments.

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An hour−long sample presents this break−up of protocols and their respective percentages:

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