LDP autodiscovery Slide 1 IETF63 Paris L2VPN WG LDP Autodiscovery LDP-based Autodiscovery draft-stein-ldp-auto-00.txt joint work with Simon Delord

LDP autodiscovery Slide 2 Core Network MPLS-enabled Access Network CE CORE PE (S-PE) CE P P P P Access Network Architecture P P P fiber access node DSLAMDSLAM there may also be combined multiservice access nodes

LDP autodiscovery Slide 3 Access Network Characteristics ACCESS NETWORK simple tree (or ring) topology (may be redundant links) limited BW limited computational power 1000s of access nodes no BGP, may not be IGP LDP for access LSP setup CORE NETWORK rich topology huge BW strong computational power smaller number of routers BGP LDP

LDP autodiscovery Slide 4 MS-VPLS CE SPESPE SPESPE SPESPE SPESPE SPESPE SPESPE SPESPE PE in VsetPE joining Vset PE not in Vset core A core B core C access network access network access network access network MS-VPLS supported by MS-PWs

LDP autodiscovery Slide 5 Service Discovery network elements and links (in both access and core networks) are relatively static (perhaps add or change 1 or 2 elements per day) hence network discovery is not an operational burden manual provisioning of LDP sessions between PEs is reasonable services are by their nature dynamic (perhaps add several users per day to each set of services) manual provisioning of services is a logistical nightmare for scalability need service discovery when BGP is available (i.e. in core network) it can be used for autodiscovery of all types when only LDP is available need to have an LDP-based technique

LDP autodiscovery Slide 6 Autodiscovery possibilities central server holding Vset (single point of failure) each PE in Vset periodically advertises the fact (very chatty) PW wanting to join Vset sends label mapping to all PEs (thousands of un-necessary mapping messages and perhaps bindings) PE wanting to join Vset inquires and initiates PW setup (w/o central server needs to send inquiry messages and collect responses and then one PE needs to initiate setup of many MS-PWs) PE wanting to join Vset announces (join messages) and Vset members initiate PW setup

LDP autodiscovery Slide 7 JOIN Message CE SPESPE SPESPE SPESPE SPESPE SPESPE SPESPE SPESPE core A core B core C SPESPE NB SPE used for JOIN message is not necessarily used by PW

LDP autodiscovery Slide 8 PW Setup CE SPESPE SPESPE SPESPE SPESPE SPESPE SPESPE SPESPE core A core B core C PW setup uses whatever MS-PW mechanism PWE3 decides upon