Saravanan%20Govindan - PowerPoint PPT Presentation
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Saravanan%20Govindan
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Local-MAC and split-MAC designs to work together ... Configuration Consistency (Mandatory) Regular exchange of WTP configuration information ... – PowerPoint PPT presentation
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Title: Saravanan%20Govindan
1
CAPWAP Objectives
- Saravanan Govindan
- March 2005
- ltdraft-ietf-capwap-objectives-00.txtgt
2
Background
- WG draft
- Combines objectives from individual submissions
- Includes inputs from IETF 61 discussions
- Structure from CAPWAP charter
- Prioritization of Objectives
- Mandatory Accepted, Desirable, Rejected
- Classification
- Architecture, Operations, Security, Operator
requirements
3
Architecture Objectives (1/2)
- Logical Groups (Mandatory)
- Logical divisions of physical WTP
- Protocol used to manage WLAN in terms of logical
groups - Support for Future Wireless Technologies
(Desirable) - Protocol messages to be extensible for different
layer 2 wireless technologies - Support for New IEEE Extensions (Desirable)
- Accommodate definitions by IEEE groups
- e.g. APF AHC
4
Architecture Objectives (2/2)
- Interoperability Objective
- Local-MAC and split-MAC designs to work together
- Protocol involves negotiations to determine
appropriate split - Interconnection Objective
- Protocol operations to be independent of
underlying transport technology - Multiple Authentication Mechanisms (Desirable)
- IEEE 802.11i support
- Support for other mechanisms e.g. web
authentication
5
Operational Objectives (1/3)
- Support for Traffic Separation (Mandatory)
- User data and control traffic are mutually
separated - Simplifies protocol operation
- Device Transparency (Mandatory)
- CAPWAP protocol between AC and WTPs
- Does not affect wireless terminals
- Configuration Consistency (Mandatory)
- Regular exchange of WTP configuration information
- e.g. WTP load, operational state
- Firmware Distribution
6
Operational Objectives (2/3)
- System-wide Resource State (Mandatory)
- Exchange of network state information switching
segment wireless medium segment - e.g. congestion, interference levels
- Resource Control (Mandatory)
- Protocol to maintain IEEE 802.11e QoS mapping
across switching and wireless medium segments - IEEE 802.11i Considerations
- Authenticator and encryption points distinctly
located - Key distribution among them (Mandatory)
7
Operational Objectives (3/3)
- STA Admission Control
- Access control needs to be based on both
switching and wireless medium segments - e.g. control based on congestion and radio
interference - Trust Model Definition
- Considerations for separation of authenticator
and encryption locations - Security Borderline Control (Desirable)
- Mutual security between logical groups
- Centralized WTP Management (Rejected)
- Protocol to be provisioned for WTPs not managed
by AC
8
Security Objectives
- CAPWAP Protocol Security (Mandatory)
- Mutual authentication
- Secure exchanges between AC and WTPs
- System-wide Security (Mandatory)
- Prevention against outside threats
- e.g. rouge wireless terminals PMK sharing
9
Discussions so far (1/3)
- Future Wireless Technologies
- Protocol messages need to be extensible for other
(non-IEEE 802.11) layer 2 technologies - CAPWAP Protocol Security
- Key establishment protocol to be secured
against possible post-establishment compromises - Transport Layer Independence
- CAPWAP operations to be independent of IP
versions - Protocol to operate over intermediate networks
- With possibly many hops
- Possibly under administrations
10
Discussions so far (2/3)
- Interoperability Objective
- Managing different split-MAC local-MAC
variations - Protocol can provide simple capabilities exchange
- AC can then decide if variations can/will be
supported - Traffic Separation
- Control traffic not to be combined with data
traffic - Resource Control
- QoS mapping for IEEE 802.11e and other IEEE TG
semantics (TGk, TGu, TGv)
11
Discussions so far (3/3)
- Statistics
- Protocol to allow exchange of various statistics
information WTP load, loss rates etc. - Device Transparency
- Protocol to be transparent to wireless devices
instead of users
12
Next Steps
- Discuss objectives further
- Categorization
- Consider any additional objectives
- Finalize requirements and gain consensus
13
- Questions?
- Comments?
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