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Is IP used in CAPWAP solely to justify it being defined in the IETF?
CAPWAP is all about scaling!
Enterprise networks follow the recommended distribution/core network architecture proposed by Cisco.
This means that networks have a greater number of smaller subnets
Using a layers 2 protocol between the AP and the AR means:
A greater number of ARs per network (one per subnet), or
Extending VLANs to create the perception of a larger subnet
IT managers have spoken. They want to have fewer ARs, centralized in their core network. So L3 is necessary.
PPT Version