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T-MPLS Control Plane
David Huo
Feng GaoZTE Corporation
2008/ 05
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Agenda
Features
Requirements
Open issues
Standard evolution
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Transport-MPLS
T-MPLS is one of the PTN technologies based on CO-PS
T-MPLS=MPLS + OAM L3 Complexity
Packet-based
Low TCO
Survivability
Connection
oriented
Enhanced OAM
Multiple services
support
PTN
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Struc ture of T-MPLS Network
PE PE
P
P
P
DCN
Management Plane
Forwarding Plane
ControlNode
ControlNode
ControlNodeControl
Node
ControlNode
Control Plane
LSP
Client A Client Z
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Control Plane
Functionalities
Signaling
Routing
Discovery
Foundation
Protocol: GMPLS
Architec ture: ASON (G.8080)
Benefits
Multi-vendor compatib ility (E-NNI)
Automatic Provisioning Automatic and effic ient protec tion/ restoration
(resources sharing, multip le faults survivability)
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Agenda
Features
Requirements
Open issues
Standard evolution
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CS vs PS: Cha rac teristic Differenc e
CS PS
channel rig id flexib le
label physic al log ica l
traffic predic table statistica l
bandwidth symmetrical asymmetrical
connection QoS assured need control
service simple diverse
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Basic requirements of CP
Independent of forwarding plane and managementplane
Addresses hiding and independenc e, addresses
mapping or translating Call and c onnec tion control Permanent connec tion, soft permanent connec tion and
switched connec tion
Connec tion management and maintenanc e, inc ludingestab lishment, modification and release Control domain partitioning and inter-domain operation Constra int-based route calculation LSP QoScontrol Link d iscovery and management Survivability, inc luding protec tion and restoration
Management of c ontrol p lane
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G.8080: CP Arc hitec ture
NCC
CC
LRM
RC
TAP DA
PC
DA: Discovery agent
LRM: Link resource mgmt
TAP: Termination&Adaptation
PC: Protocol controller
RC: Route controller
CC: Connection controllerNCC: Network call controller
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Network Model
Client A
Client Z
PE PE
PE PE PE
PE
PE
PE
PE
Provider A Provider B
Domain X
Domain Z
Domain Y
UNI
UNI
E-NNI E-NNI
E-NNI
E-NNI
I-NNI
I-NNI
I-NNI I-NNI
NCCb NCCd NCCg NCCh NCCr NCCtCCCa CCCz
CCa CCzCCb CCdCCc CCg CCh CCr CCs CCt
B
C
D G HR
ST
Call Signaling
Connection Signaling
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Agenda
Features
Requirements
Open issues
Standard evolution
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Resourc es Management
VSCircuit Switch Packet Switch
Rigid channels Flexible channels
Require mapping log ical label to corresponding bandwidths
Connec tions bandwidth tends to be dynamic Connec tion admission c ontrol is required for the c lient
accesses Connec tions can be more than in c irc uit switch network
Bandwidth management become more complex
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Bi-d irec tiona l Asymmetric LSP
PE
PE
Client AClient Z
B
CE
G
D F
Bi-d irec tiona l LSP is congruent and ca n be asymmetric
Signaling extension is needed
Resources alloc ation and management bec ome challenging
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Nested LSP
PE
Client A Client ZB
D E
Nested LSP improves the scalab ility IETF RFC4206, LSP hierarc hy with GMPLS TE Protec tion/ restoration of nested LSP is cha lleng ing
C
F G
PE
PE
PE
H J Client YClient X
I
LSP 1 FHLSP 2 BILSP 3 CJ
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Link Disc overy and Fault Management
Link d iscovery is useful, regardless of thecontrol plane
Functions Auto-d iscovery link connec tions be tween nodes Reduce manual configuration and reduce
possibility unexpec ted errors in configuration Exposing misconnec tions
LMP is an option for the implemen-tation of linkdisc overy and manage-ment of T-MPLS
IETF LMP Control channel management Link p rop erty correlation
Link c onnec tivity verification, Fault management
Discovery mec hanism c an also be achieved inforwarding plane by using OAM
Node A Node B
LMP A LMP B
Link
Test Message
LMP Message
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T-MPLS Survivab ility
Protection 1:1 protec tion
1+1protection
Ring protec tion
Restoration Hard/ soft rerouting
Pre-c omputation/ dynamic restoration
Issues Triggers to initiate rec overy ac tion
Segment protec tion/ restoration vs. E2Eprotec tion/ restoration
Different leve l of survivability depend ing on GoS
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Servic es support
A1 A2
A3
I J K
M
L
N
O
P
E-Line P2P LSP
E-TREE P2MP LSP signaling
Route optimization
Protec tion/ Restoration Require enhancement to
ASON/ GMPLS approach
A1 A2
A3
I J K
M
L
N
O
P
E-LAN No MP2MP LSP signa ling
Multip le P2P LSPs simula tion
A1 A2
A3
I J K
M
L
N
OP
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Multilayer Interc onnec tivity
Client Client
IP/MPLS network
T-MPLS network
OTN network
T-MPLS
Control PlaneOTN
Control Plane
IP/MPLS
Control Plane
T-MPLS network
Unified Control Plane
Signaling interworking TE-links flooding and abstrac tion Route c omputation, PCE Multilayer survivability
Peer or overlay Still many open issues
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Agenda
Features
Requirements
Open issues
Standard evolution
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ITU-T
Requirements &Architecture
G.8080
(G.807)
G.8080 Amd.1 G.8081 Terms &Definitions
G.7712 G.7713
G.7713.1
G.7713.2
G.7713.3
G.7714.1 G.7715.1
G.7716 G.7718
G.7718.1
G.7714 G.7715
G.7715.2
Call & ConnectionManagement
AutoDiscovery
Routing Framework forManagement
CP initialization,Reconfiguration
and Recovery
DCN
PNNI
RSVP-TE
CR-LDP
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IETF
RFC 3945GMPLS
Architecture
RFC 3471GMPLS Signaling
Functional Description
RFC 4139GMPLS Signaling
Extensions for ASON
RFC 4202Routing Extensionsfor GMPLS
RFC 4204LMP
RFC 4426GMPLS Recovery
Functional Specification
RFC 3472CR-LDP Extensions
RFC 3473RSVP-TE Extensions
RFC 4203OSPF Extensions
RFC 4207SDH LMP Test Message
RFC 4209DWDM LMP
RFC 4428Analysis of GMPLS
Recovery Mechanism
RFC 4258GMPLS Routing for ASON
Signaling
Routing
LMP
Survivability
ASONExtensions
GMPLS MIB RFCsManagement
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Sta nd ard Evo lution
Evolution of T-MPLS c ontrol p lane
ITU-T + IETF + OIF
ITU-T foc us on
Requirements, arc hitec ture and func tionalities
IETF foc us on
Design and extension of control protoc ols, such as
signaling , routing and LMP protoc ols
Clarification and solution of some spec ific problems ofCP
OIF focus on UNI,E-NNI
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The End
Thanks !
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