300-425 · Question #16
Which UDP port numbers are used for exchange mobility packets in an AireOS wireless deployment?
The correct answer is D. UDP 16666 for control plane, UDP 16667 for data plane. Cisco AireOS reserves specific UDP ports to separate mobility control signaling from mobility data forwarding between wireless controllers.
Question
Which UDP port numbers are used for exchange mobility packets in an AireOS wireless deployment?
Exhibit
Options
- AUDP 16666 for control plane, EoIP (IP protocol 97) for data plane
- BUDP 16668 for control plane, UDP 16667 for data plane
- CUDP 16667 for control plane, UDP 16666 for data plane
- DUDP 16666 for control plane, UDP 16667 for data plane
How the community answered
(46 responses)- A2% (1)
- B2% (1)
- C4% (2)
- D91% (42)
Why each option
Cisco AireOS reserves specific UDP ports to separate mobility control signaling from mobility data forwarding between wireless controllers.
EoIP (IP protocol 97) was used in older AireOS versions for data tunneling but is not the current standard; current AireOS mobility uses UDP for both planes, not raw IP protocol 97.
UDP 16668 is not a defined AireOS mobility port; using this port assignment would prevent controllers from establishing a valid mobility group.
This answer reverses the correct port assignments - 16666 is assigned to the control plane and 16667 to the data plane, not the other way around.
AireOS uses UDP 16666 for the mobility control plane, which carries keepalives, roam state synchronization, and signaling messages, and UDP 16667 for the mobility data plane, which tunnels client traffic between controllers during inter-controller roaming.
Concept tested: AireOS inter-controller mobility UDP port assignments
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/mobility.html
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