CAPWAP WG CAPWAP Tunneling Protocol CTP Inderpreet Singh

CAPWAP WG CAPWAP Tunneling Protocol (CTP) Inderpreet Singh Chantry Networks A division of Siemens AG IETF 62, Minneapolis, MN

Base Functionality of CTP l AP to AC Registration Functions l l l Exchange of security credentials Authentication mechanisms Capability exchange AP and AC session creation Keep Alive l l Periodic poll messages to confirm connectivity between AP and AC Supports availability failover and alert triggers

Base Functionality of CTP l Mobile Session Management l Connection management MU connection and disconnection services l Encryption key management l l l Policy exchange services Encapsulation of User Data l l l Encapsulated 802. 3 data Identifiers that assist in understanding policy assignment (i. e. Network ID, WTP ID etc. ) TOS bit translation

Base Functionality of CTP l AP Management l Configuration AP auto request on boot up l Triggered from AC l l Statistics l l Periodic polling from AC Firmware Upgrade Triggers AP auto request on boot up l Triggered from AC l l AP State Management l Reset services, operational state

The Objectives l Control, management and provisioning of WTPs and ACs Network layer agnostic (L 2 or L 3) Radio Technology agnostic l New requirement !! l l l Local vs. Split MAC agnostic

The NON-Requirements l AC Discovery l l l Use DNS or DHCP option or SLP (unicast/multicast) or Static Config SW Image update mechanism l l Define sw update command messages l SW Version l SW server IP address Utilize ftp or tftp

CTP Transport l l UDP based only No distinction of L 2 or L 3 l l No fragmentation/reassembly No L 2 specific discovery

Configuration and Statistics l Assumption: All WTPs incorporate an SNMP agent l l l This is true for 802. 11 Access Point reference designs, but also assumed for future wireless APs Every 802 standard has a MIB defined Example: 802. 11 Annex D defines 802. 11 MIB already Model all configuration and statistics on a MIB and utilize the CTP transport to carry the OIDs for configuration and statistics Advantage l l Need to do MIB work anyway for CAPWAP Flexible and modular for other wireless technologies

Local vs. Split MAC ATT-MAC-INFO – This attribute consists of information pertaining to the implementation of the wireless MAC layer in the WTP. This in turn specifies to the AC the expected data type that will be received. At this time only two types of MAC implementation are supported, ie. Local MAC and Split MAC. Type= 3 Length= 2 bytes Value= MAC layer information as defined below: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+ | RADIO-INDEX | MAC-TYPE | +-+-+-+-+-+-+-+-+ where RADIO-INDEX is a unique index of the enumeration of the number of radios that the AP supports MAC-TYPE is defined as o Local MAC = 1 o Split MAC = 2

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