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Concept of Automatically switchedOptical Network
- Rajesh, JTO
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What is ASON?The automatically switched optical network is a newgeneration optical transmission Network.
OverviewRecently SDH optical communication system widely used
an telecommunication in backbone layer, metropolitan layer &
in access layer in transport network. SDH offers first
protection and excellent management performance.
with the development of telecommunication network and
increasing user demands some problems in SDH systems
appear more than more serious such as low bandwidth utilize
and monotonous protection.
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ASON just come to solve the above problems
The ASON is an optical transport network composed
of ASON Network elements. ASON performance
signaling transmission and switching. These NEs can
store the topology, routing information of the whole
network, automatically create and remove services
through signaling.
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What is ASON / GMPLS
CP(Control Plane)
TP(Transport Plane)
CCI
UNI data
UNI control
NMI
NNI E-NNI
CCI
NMI
The purpose of the control plane isto:
Enhance Network Reliability andStability
Lower Network TCO(Total Cost ofOwnership)
Simplify Network Operation
ASON/GMPLS Introduces control
plane to ON.Its the first time to adopt dynamic
switching function.
Distributed control plane is thetrend.
Network Management Interface
MP(Manage Plane)
ASON: Automatic Switched OpticalNetwork, Requirements
defined by ITU-T.
GMPLS: Generalized Multi-ProtocolLabel Switching, A seriesprotocols (LMP, RSVP-TE,OSPF) defined by IETF.
NENE
NENE NE
OCCOCC
OCC OCC
OCC
Connection
Control Interface
NMS
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The Logical Architecture of an ASON can be divided into 3
planes:
Transport Plane
Control Plane
Management Plane
The Transport Plane contains a number switches ( optical orotherwise) responsible for transporting user data via
connections. These switches are connected to each other via
PI (Physical Interface).
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The Control Plane is responsible for the actual
resource and connection management within an ASNnetwork. It consists of a series of OCC (OpticalConnection Controllers), interconnected via NNIs (Network to Network Interfaces).
These OCCs have the following functions:Network Topology discovery (Resource discovery)Signaling, Routing, Address AssignmentConnection Set-up/Tear-downConnection protection/restoration
Traffic EngineeringWavelength assignment
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Management Plane is basically a complementplane of control plane. It maintain the transport plane,
the control plane and the whole system. Its mainfunctions are as follows:-
1- Performance management
2- Fault management 3-Configuration management
4- Security management
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How does ASON/GMPLS work ?
Automatic Resource Discovery (LMP)
Lower OPEX
Mesh Networking (OSPF)Improve resource utilization
Automatic Restoration (RSVP)
Enhance reliability
?
?
? ?
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Where does ASON/GMPLS work
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Internet Traditional Voice ServiceVPN3G&NGNIPTV
Mesh networking improvesresource utilization Plug & play
Fast expansion and upgrade
SLAs
IP Core
Optical Transport Network
Edge layer Router
ASON node
Inter-city Network
Metro/Regional Network
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In an optical network without ASON, when-ever a user
requires more bandwidth, a new connection has to be requested
and the service provider has to manually plan and configure the
route in the network.
This is not only time consuming, but also wastes bandwidth
when the user economically uses the connection.The bandwidth
demand is going to increse with every momemts &IT has
become precious resource.We have the expectations from future
optical networks that they will be able to efficiently handleresources as quickly as possible .
The Need for ASON
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The Need for ASON
ASON will be able to fulfill the requirements for thenewer generation of optical networks such as:
Fast and automatic end-to-end provisioning
Fast and efficient re-routing
Support of different clients, but optimized for IP Dynamic set up of connections
Support of Optical Virtual Private Networks (OVPNs)
Support of different levels of quality of service
(These requirements are not restricted to optical networks and canbe applied to any transport network (including SDH Networks)
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P f tl i t ki ith
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Perfectly inter-working withtraditional SDH network
TraditionalNetwork
NMS: T2000
Hybrid Network of ASON network and traditional MSP-Ring
Unified NMS of ASON NE and legacy NE
E2E service point&click provisioning between traditional and ASON NE by Unified NMS
The timeslot of ASON NE can be configured as static circuit
Supports virtual TE-link
ASON Network
Traditional circuit
Intelligent circuitThe same fiber
Traditional NE
ASON NE
Virtual TE-link
Intelligent circuit
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Supported optical transport services
Permanent OCh:- Permanent connection is a serviceconnection computed before hand and created through NM.The traditional SDH connections are permanent connection.
Switched OCh:-Switched connection is a service connectionrequested by a terminal user like Router and then created in the ASON
control plane through signaling at the UNISoft Permanent connection :-.setup from the management
system using routing capabilities embedded in the network. It requiresrouting and signaling at the NNI to establish the connection.
Optical Virtual private Network
Lamda trunking:
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Resource Reservation
The time slot created with ASON Services are managed bythe ASON software and cannot be used by the any software tocreate permanent connection.
Level Switching Path (LSP) The LSP is the path of ASON services passing through in
ASON to create ASON services is to crate LSPs.
Control Channel (CC) Control channels are created and maintained between
adjacent nodes by link management protocols (LMP). Controlchannels divided into two types:-
1. In fiber Control Channel:- Usage DCC channel (D4 to D12) andcan be discovered automatically.
2. Out of fiber Control Channel:- Usage the Ethernet link and needmanual configuration.
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High Reliability Control Plane: controlchannel backup
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Dm~Dn Dm~Dn
Dm~DnDm~Dn
Dm~Dn
Dm~Dn
Dm~DnNMS
Out-of-Band (DCN)
In-Band (D-byte)
Supports in-band (D-byte) and/or out-of-band control channel.
Provides 1+1 stand-by for control channels when both in-band and out-of-band are deployed.
The working channel will switch to the backup one in case of working channel failure.
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Control Link:- Controls links are detected and maintained byOSPF protocol. All ASON NEs get the control topology of thenetwork.
Traffic Engineering Link (T E Link):- T E Link is thetraffic engineering link. The ASON, NEs sends its bandwidthinformation to other ASON NEs through the T E Link to provide fordata route computation.
Rerouting :-rerouting is means of resuming services .when anLSP is disconnected, the source node queries and finds a best routeto resume services.
Rerouting Lockout :-rerouting is not required after failure ofLSP in some cases then we need rerouting lockout
Rerouting Priority :-when several LSPs have the samesource node reroute simultaneously ,the LSP of higher priorityreroutes first and has more possibility to reroute successfully.
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Shared risk link group (SR LG) :-fibers in the sameoptical cable have the same risks, when the cable is cut ,all fibersare cut. therefore ASON services should not be rerouted to another
link that has the same risk.
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Topology Auto-Discovery
Control Topology Auto-Discovery :-after the fibers in anASON network are connected correctly ,each ASON NE discovers control
links automatically through OSPF and floods its own control link to the
whole network.
Service Topology Auto -Discovery :-After an ASON NEcreates a control channel between neighbors NEs through LMP,TE linkverification can be started. Each ASON NE floods its own TE links to the
whole network through OSPF-TE. Each NE then gets the network wide
TE links. this is network wise service Topology.
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Control topology auto-discovery
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R1
R2
R3
R4
:ASON NE
:User equipment
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Service topology auto-discovery
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:ASON NE
:User equipment
R1
R2
R3
R4
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End To End Configuration
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End-To-End Configuration
The ASON supports both SDH permanent connections and end-to-end
ASON services. To configure an ASON service, we only need to
specify its source node, sink node, bandwidth requirement and
protection level. Service routing and cross connection at intermediate
n o d e s a r e a l l a u t o m a t i c a l l y c o m p l e t e d b y t h e n e t w o r k .
As compared with the service configuration of the SDH network, it fully
utilizes the routing and signaling functions of ASON NEs and thus it is
convenient to configure the service.
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Provide Multiple levels of service: SLA
Index Diamond Gold Silver Copper Iron
Service level
Protection
scheme
Permanent 11
Protection
1 + 1 Protection +
Restoration
1 + 1 Protection
Virtual Ring
Protection
Virtual Ring
Protection +
Restoration
Dynamic Restoration
Pre-Calculating
Restoration
Shared Mesh
Restoration
None None
Description
Provide permanent
protection for service
when network resource
is utilizable
Performs as protection
most of the time, if
protection is invalid,
restoration works
Real-time restoration
of service, no need of
standby resource
Index Protection time
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Different kinds of service for different customers needs.
Protection and restoration combine for multi failures,improves the reliability
Supports High and Low Restoration Priority
Hitless interchanging on line between SLAs
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D i a m o n d s e r v i c e s h a v e t h e b e s t p r o t e c t i o n a b i l i t y .W h e n t h e r e a r e e n o u g h r e s o u r c e s i n t h e n e t w o r k ,
Diamond services provide a permanent 1+1 protection &
ASON/GMPLS based restoration. Diamond services are
a p p l i c a b l e t o v o i c e a n d d a t a s e r v i c e s , V I P p r i v a t e
L i n e , s u c h a s B a n k i n g , S e c u r i t y a n d A v i a t i o n .
DIAMOND SERVICE (PLATINUM SERVICE)
Di d S i P t 1 1 P t ti
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Diamond Service: Permanent 1+1 Protection
Working Path
Protection Path
Any change of resource will be indicated on the NMS immediately
Provide permanent protection for service when network resource is utilizable
The highest quality private-line solution: 99.9999%
NMS
Di d S i P i R i
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Diamond Service 1+1Protection+Restoration
Any change of resource will be indicated on the NMS immediately
Provide once 50ms protection and multi restoration, Anti multi fiber-failures
NMS
Working Path
Protection Path
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Diamond Service 1+1 Protection
NMS
Working Path
Protection Path
Any change of resource will be indicated on the NMS immediately
Provide 50ms protection for once fiber-failure
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GOLD SERVICE
Gold services are applicable to voice and significant
data services. Compared with diamond services, gold
services have greater bandwidth utilization.
When a fiber on the path of a gold service is cut, the
ASON triggers MSP switching to protect the service at
first. If the multiplex section protection fails, The ASON
triggers rerouting to restore the service.
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Gold Service: Virtual RingProtection + Restoration
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NMS
Virtual Ring
Protection Route
Restoration Route
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Gold Service: Virtual RingProtection + Restoration
When the first fiber cut happens, virtual ring will performprotection(
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SILVER SERVICE
Silver services, the revertive time is hundreds ofmilliseconds to several seconds. The silver level
Service is suitable for those data or internet services
that have low real-time requirement. Silver servicesare also called rerouting services. When an LSP
failure, the ASON triggers rerouting to restore the
service. If there are not enough resources, service
may be interrupted.
Silver Service: No Dedicated Resource is
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Silver Service: No Dedicated Resource isNeeded
NMS
original path
rerouting path
Revertible
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Silver Service: No Dedicated Resource isNeeded
When service is fall down, it will be restored to the newroute. Service rerouting can be set as Revertible or Non-revertible.
All restoration service can be treat as High or Low priority,
When resource is limited, High priority service isguaranteed to be reroute
Rerouting can be locked / unlocked.
Improves the bandwidth utilization dramatically and providecontrolled networking
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Sil S i P C l l i /P l R i
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Silver Service Pre-Calculating/Preplan Restoration
MDS6600
iManager T2000
Preplan path
preplan path
original path
rerouting path
Rerouting according to the preplan path
Controllable and predictable circuit resource managing
Silver Service Shared Mesh Restoration
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Silver Service Shared Mesh Restoration
MDS6600iManager T2000
Bandwidth Resource Reserved Path
reserved path
original path
rerouting path
Rerouting according to the reserved path
1
2
shared restorationresource
Insure service restoration
100% successfully
VC4
Sil S i Sh d M h
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Silver Service Shared MeshRestoration
The pre-defined path will be dispatched to nodesthrough the T2000 after simulating by MDS6600
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The pre-defined path will be dispatched to nodes through the
T2000 after simulating by MDS6600.
The overlapped timeslot resources can share by multiple
reserved routes
Ensure the success of 100% of rerouting and guarantee the
reliability of rerouting for key services
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COPPER SERVICE
The copper services are seldom used. Generally,
temporary services, such as the abrupt services in
holidays, are configured as copper services.
Copper services are also called non-protection
services. If an LSP fails, services do not reroute
and are interrupted.
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IRON SERVICE
The iron services are also seldom used. Generally, temporary
services are configured as iron services. For example, when service
volume soars, during holidays, the services can be configured as
iron services to fully use the bandwidth resources.
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Best Effort Rerouting When No Many
Directions
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Original Route
Other Route
Bandwidth availabilityis improved by reusing
part of the original route
When there are not so many directions, Best effort rerouting can succeed in
finding a route to go, so that network reliability is enhanced
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ALTTC 52
Thanks