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© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 1© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 1© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 1Cisco Confidential 1
Separation of CAPWAP Control and Data Plane:draft-zhang-opsawg-capwap-cds-00
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Cisco Confidential 2
What is the problem• CAPWAP used widely in WLAN
deployments
• Two modes
• Local MAC mode
• Split MAC mode
• Mainly interested in Split MAC mode
• CAPWAP assumes control and data plane are co-located on the Access Controller
• No mechanism to specify different IP address for data tunnel to carry user traffic
• No way to split CP and DP in Split-MAC mode
Access Controller(aka WLC)
WTP(Wi-Fi AP)
Data Channel
ControlChannel
Access Controller(aka WLC)
WTP(Wi-Fi AP)
Data Channel
ControlChannel
Locally bridged traffic
Local MAC Mode
Split MAC Mode
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Cisco Confidential 3
Proposed Solution
AC-CP
WTP
AC-DP
• Split AC (access controller) into two parts
• AC-CP (Control Plane)
• AC-DP (Data Plane)
• WTP created two sets of tunnels
1. Control and Data Channel to AC-CP
2. Data Channel to AC-DP
• AC-CP handles
• CAPWAP Control Chanel: Control/Management of AP
• CAPWAP Data Channel: User generated Management traffic (security, action frames, etc)
• AC-DP handles
• CAPWAP Data Channel:
• User generated traffic (non –management traffic)
Data Channel
Control Channel
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Cisco Confidential 4
Next Steps• Adopt draft draft-zhang-opsawg-capwap-cds-00
as working group document