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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Wireless And Mobile Networks
Exercise:
Review
Question:11 | ISBN:9780132856201 | Edition: 6

Question

Section 6.3.4 discusses 802.11 mobility, in which a wireless station moves from one BSS to another within the same subnet. When the APs are intercon- nected with a switch, an AP may need to send a frame with a spoofed MAC address to get the switch to forward the frame properly. Why?

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Answer

Initially the switch has an entry in its forwarding table which associates the
wireless station with the earlier AP. When the wireless station associates with the
new AP, the new AP creates a frame with the wireless station’s MAC address and
broadcasts the frame. The frame is received by the switch. This forces the switch
to update its forwarding table, so that frames destined to the wireless station are
sent via the new AP.

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