Signaling Protocol for Access Service Network using LDP (draft-matsuda-l2vpn-access-service-protocol-00.txt) Tetsushi Matsuda Information Technology R&D Center Mitsubishi Electric Corporation for IETF 59 th meeting on March 3, 2004

What do I call Access Service Network? Basically Network Access Provider’s network A subscriber can specify the ISP to connect to by authentication information (usually NAI) that the subscriber presents when attaching to an Access Service Network L2TP and PPPoE+ADSL is commonly used to implement a Broadband Access Service Network today RADIUS Server Access Service Network L2TP ISP1 RADIUS Server ISP2 Subscriber1 PPPoE ADSL RADIUS Server LAC L2TP Network Server

Brief overview of the draft The draft proposes to implement an Access Service Network which allows a subscriber to connect to an ISP by authenticating with IEEE 802.1X as a special kind of VPLS  It is desirable not to forward broadcast/multicast frames between subscribers (PWs) in an Access Service Network for security  Bridge function exists only in Network Server  Network Access Concentrator maps a port attaching to a subscriber to a PW between a Network Access Concentrator and a Network Server (simlar to VPWS) RADIUS Server Access Service Network RADIUS Server ISP1 Subscriber X Subscriber2 Bridge Function Pseudo Wire Do not forward broadcast/multicast frames between PWs Network Server Network Access Concentrator

Brief overview of the draft (cont.) Network Access Concentrator determines Network Server with which to set up PWs by querying a RADIUS server in Access Service Network using NAI as a key Use LDP signaling discussed in PWE3 WG to set up pseudo wires between a Network Access Concentrator and a Network Server  Defines a format of Generalize ID FEC for Access Service Network application (SAII and TAII, no AGI) QoS information can be specified when establishing PWs  Transport QoS information for each subscriber in RADIUS Access-Accept message returned by RADIUS server in ISP  Transport QoS information for each subscriber in LDP Label Mapping message

Merit of the approach Reduced overhead of packet encapsulation format compared to L2TP  Use Pseudo Wire to transport Ethernet frames (MPLS VC label and tunnel label) 38byte for L2TP -> 8byte for label stack (+18byte Ehternet Encap.) Enable QoS service for each subscriber  Implementation of QoS such as Minimum Guaranteed Bandwidth is made easier by using LSP as PSN tunnel

I Hope this is considered to be a WG item. Comments are welcome. Thank you!