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

IETF63 Paris L2VPN WG LDP Autodiscovery LDP-based Autodiscovery draft-stein-ldp-auto-00.txt joint work with Simon Delord. CORE PE (S-PE). fiber access node. P. P. P. P. P. P. P. DSLAM. CE. CE. CE. CE. CE. CE. CE. CE. CE. Access Network Architecture. MPLS-enabled

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

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  1. IETF63 ParisL2VPN WGLDP AutodiscoveryLDP-based Autodiscoverydraft-stein-ldp-auto-00.txtjoint work with Simon Delord

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

  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

  4. CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE SPE SPE SPE SPE SPE SPE SPE CE MS-VPLS access network core B access network core A access network core C access network MS-VPLS supported by MS-PWs PE not in Vset PE in Vset PE joining Vset

  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

  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

  7. CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE SPE SPE SPE SPE SPE SPE SPE SPE CE JOIN Message core B core A core C NB SPE used for JOIN message is not necessarily used by PW

  8. CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE SPE SPE SPE SPE SPE SPE SPE CE PW Setup core B core A core C PW setup uses whatever MS-PW mechanism PWE3 decides upon

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