draft-ietf-ccamp-gmpls-overlay-05.txt Generalized Multiprotocol Label Switching (GMPLS) User-Network Interface (UNI): Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Support for the Overlay Model

1
draft-ietf-ccamp-gmpls-overlay-05.txtGeneralized
Multiprotocol Label Switching (GMPLS)
User-Network Interface (UNI)Resource
ReserVation Protocol-Traffic Engineering
(RSVP-TE) Support for the Overlay Model

• Adrian Farrel - adrian_at_olddog.co.uk

2
Status of Draft

• Established CCAMP I-D
• Passed WG last call 3Q2004
• Now in RFC Editor queue
• Principal authors
• George Swallow
• John Drake
• Hirokazu Ishimatsu
• Yakov Rekhter

3
Summary of Draft

• Provides a description of how to use existing
  GMPLS techniques in the Overlay Model.
• This model places a UNI between the Overlay
  (Customer) Network and the Core (Provider)
  Network.
• No new protocol elements defined
• Clarification of procedures and applicability

Overlay Network
Overlay Network
Edge Node
Core Node
Core Network
Overlay Network
Overlay Network
4
Relevance to L1VPNs

• Section 7 describes the applicability of the
  Overlay model to VPNs
• Handles GMPLS and non-GMPLS core networks with a
  GMPLS UNI
• Our focus here is on GMPLS core networks
• Uses hierarchical LSPs across the core
• Hierarchical LSPs are pre-established or
  established on demand
• No exchange of routing information to the client
  network
• Routing exchanges across the core may provide
  membership/reachability information

5
L1VPN Model From Overlay Draft

• Hierarchical LSP established across the Layer 1
  core
• VPN connection between edge nodes is a three-hop
  LSP
• Tunneled down the hierarchical LSP
• Hierarchical LSP may be pre-established or set up
  on demand when request for VPN connection reaches
  core network
• Hierarchical LSP is not advertised as a TE link
  in the client networks

Layer 1 Hierarchical LSP
VPN Connection
Overlay Network
6
Further Discussions

• Note that LSP Stitching has been discovered since
  the Overlay Draft was written
• Stitching and shuffling mechanisms also fit
  within the L1VPN model described
• Highly applicable to the Basic Mode
• Signaling only
• No routing
• Further discussion as part of the Applicability
  I-D