Signalling Interworking for ATM VPWS draftboccil2vpnpnnimplsiw01

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Signalling Interworking for ATM
VPWSdraft-bocci-l2vpn-pnni-mpls-iw-01

• Matthew Bocci, Mustapha Aissaoui, David Watkinson
  (Alcatel)Daniel Proch, John Rutemiller
  (Marconi)Jeff Sugimoto, Ghassem Koleyni
  (Nortel)Himanshu Shah (Ciena)Martin Jensen,
  George Matey (Equipe)

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Background and Relevance

• Informational Draft describes tunnelling ATM
  signalling routing over VPWS
• PNNI is ATM signalling with dynamic routing
• AINI is ATM signalling with static routing
• ATM PW label distribution using PNNI/AINI
• Describes approved ATM Forum specification
• ATM-MPLS Network Interworking Signalling
  Specification, AF-CS-0197.00
• Make IETF participants aware of mature work in
  other bodies related to L2 VPN charter
• L2VPN charter item 2 Signalling of L2VPN related
  information for set-up of L2VPN circuits

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Problem Statement

• PNNI is being deployed on wide scale in ATM
  multiservice networks
• Widespread deployment of ATM VPWS needs to
  support interconnect of ATM SVC / S-PVC networks
• PNNI deployments are carefully engineered
• avoid changing PNNI network design/management/perf
  ormance when moving to PSN core
• PNNI is evolving
• avoid changing PSN / PW protocols with each new
  PNNI feature
• Maintain single end-to-end control plane across
  PNNI / PSN tunnel domains
• Add an optional IE to PNNI/AINI to allow it to
  exchange PW labels and negotiate PW encapsulation
  mode.

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Architecture
PE supports both PNNI and PWE3
ATM SVC/SPVC PW
MPLS
ATMPNNI
ATMPNNI
PE
PE
PSN Tunnel is a single-hop PNNI link
PNNI control channels carried on dedicated ATM PWs
Routing Control Channel
Signalling channel
PNNI control PWs established by provisioning or
PWE3 control protocol Can use any PWE3 ATM
encapsulation PW labels exchanged between PEs in
an IE in ATM signalling message
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Features

• PSN is transparent to PNNI
• No changes needed to current PWE3 / L2VPN
  protocols
• Supports multi-hop or multi-domain ATM PWs
• Resiliency can use one or both of
• PNNI rerouting to protect ATM PWs
• PSN mechanisms e.g. MPLS FRR to protect PSN
  tunnel
• ATM QoS
• PSN tunnel looks like a regular ATM link
• PEs advertise PSN tunnel QoS/traffic parameters
  to ATM, as today, for GCAC
• ATMlt-gtDiffServ traffic parameter mappings are
  proposed

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Next Steps

• Multiple interoperable implementations
  demonstrated at Supercom, 2004
• ATM Forum spec was approved last year
• draft-bocci is now in its second revision
• Fix ID nits
• Progress as informational RFC