Framework & Requirements for an Access Node Control Mechanism in Broadband Multi-Service Networks draft-ietf-ancp-framework-02.txt Presenter: Dong Sun

History Jan 2006: draft-ooghe-l2cp-framework-00.txt submitted for L2CP BOF May 2006: draft-ooghe-ancp-framework-00.txt November 2006: draft-ietf-ancp-framework-00.txt March 2007: draft-ietf-ancp-framework-01.txt July 2007: draft-ietf-ancp-framework-02.txt –Updated multicast section –Refer to draft-moustafa-ancp-security-threats for security requirements –Made network elements requirements informative –Miscellaneous edits per comments on ANCP exploder

Outline ANCP concept Reference architecture –Home Gateway, Access Node, Aggregation Network, NAS ANCP transport mechanisms –ATM => DSL Forum TR-059 –Ethernet => DSL Forum TR-101 Use cases –Access Topology Discovery –Access Loop Configuration –Remote Connectivity Test –Multicast ANCP requirements Network element requirements –Access Node –Network Access Server Management related requirements

Reference Architecture | Policy | | Server | | | CPE |---| HGW |---| | | | | | | Access | | | | Regional | | Node |---| Aggreg. |---| NAS |---| Network | | | | Node | | | | | | CPE |---| HGW |---| | | | | | Information Reports > Control Requests < Control Responses > Access Node Control Mechanism PPP, DHCP, IP

Use Case - Multicast Resource efficient multicast gets increasingly important => local replication! In order to ensure backward compatibility with the ATM access model, the NAS, aggregation node and Access Node need to behave as a single logical device –This device must have the same functionality as the NAS in the ATM access/aggregation network Actual implementation of the multicast behavior between AN and NAS not detailed in the framework –Behavior of logical device could be implemented in several ways Updated text

Next steps Can we consider this draft as complete? –No more outstanding comments from previous meetings Can we go to last call?

Backup

Terminology Line Rate –total data rate including overhead Net Data Rate –portion of the total data rate that can be used to transmit user information (e.g. ATM cells or Ethernet frames). It excludes overhead that pertains to the physical transmission mechanism (e.g. trellis coding in case of DSL) Control Channel –a bidirectional IP communication interface between the controller function (in the NAS) and the reporting/enforcement function (in the AN) Access Node Control Adjacency –relationship between an Access Node and a NAS for the purpose of exchanging ANCP messages. The adjacency may either be up or down, depending on the result of the Access Node Control Adjacency protocol operation.

Use Case - Dynamic Access Loop Attributes Communicating Access Loop attributes –Beneficial since the Access Loop rate may change overtime NAS gains knowledge about the topology of the access network (e.g. for QoS scheduling)

Use Case - Access Loop Configuration Change Access Loop parameters (e.g. rate) from the NAS –Avoids cross-organization business-to-business interactions –Allows to centralize Subscriber-related service data in e.g. a policy server The best way to change Access Loop parameters is by using profiles –pre-configured on the Access Node using EMS Mechanism could be used for additional parameters (e.g. QoS)

Use Case – Remote Connectivity Test NAS can use ANCP to initiate an Access Loop test between Access Node and HGW –Allows mixed ATM/Ethernet environment –Supports multiple Access Loop technologies (e.g. ATM/ADSL, Ethernet/VDSL) Preserve existing operational functionality

Access Node requirements General Architecture –Partitioning –Redundant controllers Control Channel Attributes Capability Negotiation Failure Adjacency Status Reporting –Adjacency protocol Identification –In line with TR-101 (e.g. Access-Node-Identifier atm slot/port:vpi.vci) –The AN MUST use the same ACI format for identifying the AN and access port in ANCP, PPPoE and DHCP messages Message Handling Parameter Control –Damping –Bundling

Network Access Server requirements General Architecture –Partitioning –Shaping based on Dynamic Access Loop Attributes –Access Loop Configuration –Remote Connectivity Test Control Channel Attributes Capability Negotiation Failure Adjacency Status Reporting Identification –In line with TR-101 (e.g. Access-Node-Identifier atm slot/port:vpi.vci) Message Handling Wholesale Model –Communicate Access Loop Attributes to an LNS