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Optical Network Integration via GMPLS
February 15, 2005
GMPLS In a Nutshell
• GMPLS = Generalized MPLS
• Builds on success of MPLS in core IP networks
– Extends notion of “label” to encompass additional transport
technologies
• TDM time slot, DWDM/CWDM Lambda, Fiber switching
– Reuses existing IP network protocols
• Topology discovery, TE resource advertisment via OSPF-TE
• Path selection, resource reservation via RSVP-TE
• Industry-wide acceptance, standards are complete
Copyright Movaz Networks, Inc. © 2005
GMPLS Controlled Path
Reuse of MPLS and IP Control
Data flow
λ2
– Ingress initiates light path setup
– Request propagated to egress
– Egress responds with lambda
– Response propagated upstream to ingress
Copyright Movaz Networks, Inc. © 2005
Setting the Stage
1.
Regional Optical Nets (RONs) arrive
1.
2.
3.
2.
User community expectations
1.
2.
3.
Extreme bandwidth, dedicated and on-demand
Inter-regional connections
RONs often interconnected via IP-only networks
1.
2.
4.
Several up and running, more in the pipeline
Connection-oriented, control plane enabled (GMPLS, UNI/NNI)
DWDM, lambda switching, edge-to-edge lightpaths
Lambdas not yet always available end-to-end
IP-only networks may not be control plane enabled
How can control plane technologies be leveraged to
meet user expectations in the current environment?
Copyright Movaz Networks, Inc. © 2005
The Ideal
RON1
“OK!”
ION
“OK!”
RON2
“OK!”
= Packet Link
= Lambda Link
“Request 5Gps”
= GMPLS LSP
RON = Regional Optical Network
ION = Intercontinental Optical Network
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“Receiving 5Gps”
The Reality
IP Network
RON1
RON2
“OK!”
“Uh, well …”
“Request 5Gps”
Copyright Movaz Networks, Inc. © 2005
How to cross the control plane gap?
Option 1: Best Effort
IP Network
RON1
RON2
N1
N2
U1
U2
1. GMPLS LSP from U1 to N1
2. GMPLS LSP from N2 to U2
-
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Each segment provisioned separately
Best-effort in the middle
IP network uninvolved in control
Option 2: Manual Stitching
IP Network
RON1
RON2
N1
N2
U1
1. GMPLS LSP from U1 to N1
2. MPLS LSP from N1 to N2
3. GMPLS LSP from N2 to U2
-
Copyright Movaz Networks, Inc. © 2005
Each segment provisioned separately
Some QoS in the middle
IP network must be MPLS-enabled
U2
Option 3: End-to-End MPLS
IP Network
RON1
RON2
N1
N2
U1
1. GMPLS LSP from U1 to N1, forms FA
2. GMPLS LSP from N2 to U2, forms FA
3. MPLS LSP from U1 to U2, thru FAs
-
Copyright Movaz Networks, Inc. © 2005
MPLS is signaled end-to-end
Routers at RONs must support FA-LSPs
IP network must be MPLS-enabled,
share signaling with RONs
U2
Option 4: Tunneled GMPLS
IP Network
RON1
RON2
N1
N2
U1
U2
1. Configured tunnel (GRE, IPIP) + TE link
2. GMPLS LSP from U1 to U2, thru tunnel
-
Copyright Movaz Networks, Inc. © 2005
GMPLS is signaled end-to-end
Best-effort in the middle
IP network uninvolved in control
Option 5: End-to-End GMPLS
IP Network
RON1
RON2
N1
N2
U1
U2
1. GMPLS LSP from U1 to U2
-
Copyright Movaz Networks, Inc. © 2005
GMPLS is signaled end-to-end
IP network must be GMPLS-enabled,
share signaling with RONs
Realizable via UNI/NNI, hierarchy
Summary
Option
Service signaled
end-to-end?
QoS end-toend?
IP Network
involved in
control?
Signaling
across admin
boundaries?
1
No
No
No
No
2
No
Yes
Yes
No
3
Yes
Yes
Yes
Yes
4
Yes
No
No
No
5
Yes
Yes
Yes
Yes
Copyright Movaz Networks, Inc. © 2005
Basic Standards
1.
Routing
1.
2.
3.
4.
2.
Signaling
1.
2.
3.
4.
5.
6.
3.
RFC3630 (OSPF-TE v2)
draft-ietf-ospf-ospfv3-traffic-02.txt (OSPF-TE v3)
draft-ietf-ccamp-gmpls-routing-09.txt (routing architecture)
draft-ietf-ccamp-ospf-gmpls-extensions-12.txt (OSPF-GMPLS)
RFC3471 (signaling architecture)
RFC3209 (RSVP-TE)
RFC3473 (RSVP-GMPLS)
OIF-UNI-01.0 (UNI extensions to RSVP)
OIF-UNI-01.0-R2-Common (UNI extensions to RSVP)
E-NNI-01.0 (initial xNNI implementation agreement)
Mature, several interoperable implementations
Copyright Movaz Networks, Inc. © 2005
Inter-domain Drafts
1. General requirements for inter-domain TE
1. draft-ietf-tewg-interarea-mpls-te-req-02.txt
2. draft-ietf-tewg-interas-mpls-te-req-07.txt
1. Both WG drafts, under discussion in Sub-IP Area, TEWG
2. Specific approaches to inter-domain GMPLS
1. draft-ietf-ccamp-inter-domain-framework-00.txt
1. Covers reachability, TE discovery, PCE, inter-domain signaling
2. WG draft, actively under discussion
2. draft-otani-ccamp-interas-GMPLS-TE-01.txt
1. Covers inter-AS reachability/TE data sharing, without specifying
particular protocols
2. Individual draft, discussed at CCAMP meeting 12/04
3. draft-ayyangar-ccamp-inter-domain-rsvp-te-01.txt
1. Extensions to RSVP-GMPLS for inter-domain signaling
2. Individual draft, also discussed at CCAMP meeting 12/04
Copyright Movaz Networks, Inc. © 2005
Thank you
Copyright Movaz Networks, Inc. © 2005
Multiple LSP Types
Packet
TDM
Lambda
Fiber
Lambda
TDM
GMPLS unifies control across technologies
Copyright Movaz Networks, Inc. © 2005
Packet