principles of the optix ason (osn)

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level: Internal Use Only 23/4/28

Li Jianxun/41149

Dong Enhua/57645

Principles of the OptiX ASON (OSN)

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Foreword

This course is developed according to the development of the OSN products in the optical network. This course aims at introducing the basic knowledge of the ASON principles. It gives an overall idea of the ASON for engineers.


Learning Guide This course is based on the principles

of ASON. Key points and difficulties of this

course Key points: Key functions of the ASON

Difficulties: ASON-related protocols


Objectives After completing this course, you should understand:

The background and concepts (for example, control plane, management plane, service plane, SC, SPC, and PC) of the ASON, and the difference between an ASON NE and an SDH NE.

The ASON-related protocols (LMP OSPF RSVP). The ASON architecture. The functional modules (for example, routing module, SC module,

signaling module, and LMP module) of the ASON software.


Contents

ASON Overview ASON Architecture Key Functions of the ASON Typical ASON Networks and

Applications


Contents

ASON Overview Why we need ASON

What’s ASON

What does ASON bring us


Why the ASON Is Needed

MADM

DCN

iManager T2100 Network-level network managemet center

iManager T2000 Subnet-level network managemet center

iManager T2000 Subnet-level network managemet center

SDH transmission network The inter-ring services are hard to be scheduled, because the inter-ring node becomes the bottleneck of scheduling the services.

The scalability of SDH network is poor. In the SDH/SONET ring structure, the bandwidth and efficiency are

low. Real-time management cannot be achieved. Network topology

changes cannot be displayed in the network management system in real time.


Why We Need ASON

VoiceVoiceVoiceVoice

DataDataDataData

With the rapid development of broadband data services and private-line lease services, the network capacity is increasing and the scheduling pressure is becoming heavy. As a result, automatic scheduling is required.

Data service burst requires that the bandwidth be applied automatically and dynamically. The traditional half-static configuration mode cannot meet the requirements.

The carrier requires reducing the OPEX and provides value-added services, because service increase does not bring proper profits.


Why We Need ASON

ASONASON

Expansibility of network Rapid service supply

Real-time network management

Bursting data service Reduction of operation cost

Flexible service grooming


What’s ASON

Automatically Switched Optical Network

Definition: With the distributed (or partial distributed) control plane that provides the function of automatically discovering and dynamically setting up a connection, you can achieve a dynamic, signaling-based, and policy-driven network based on the OTN or SDH network.

What’s ASONWhat’s ASON ？？


Separation between calls and connecting process

New features of ASON

Emerging of automatic resource discovery mechanism

New features of network survivability technology


What Are the Solutions Provided by the ASON? The ASON provides the method of configuring and modifying services quickly and

conveniently. Moreover, it overcomes the difficulties of scheduling inter-ring services, and removes the bottleneck of scheduling services on an inter-ring node.

The flexible mesh network improves the service survivability and network scalability. Therefore, it solves the problem of poor scalability of the traditional network.

The network resource usage reaches more than 50%. Therefore, it solves the problems of low bandwidth usage and efficiency in the SDH/SONET ring network.

Real-time network management solves the problems of failing to manage the traditional network in real time, and failing to display the network topology changes in the network management system.

Data service problems are

solved.


What does the ASON Bring Us?

Services Ultra-broadband services and non-

standard broadband services Bandwidth-on-demand services Virtual ring configuration services

and end-to-end circuit configuration services

Virtual optical network services Economic effects: cost and

revenue Network cost

– Investment cost– Operation/management

expenditure– Opportunity cost

Network revenue

The ASON improves the bandwidth

usage and the multi-service bearing

capability. The carrier is dedicated

itself to the requirements of users

and the return of investment.

Sustained profit is obtained.

Therefore, the ASON deeply attracts

the network planners.

Advantages of the ASON The advantages of the ASON lie in the provisioned services and the economic effects.


Questions:

Question 1: What is the background of ASON?

Question 2: What is the network type of ASON? What are the differences between the ASON network and the SDH network?

Question 3: What are the problems solved by the ASON ？


Summary

In this part, we have learned: Why we need ASON

What’s ASON

What does ASON bring us


Contents


Applications


Contents

ASON Architecture ASON Architecture

ASON Software Related Protocols


Three Planes, Three Interfaces

Control plane

Transport plane

OCC: Optical Connect Control Switch: Switching Equipment CCI: Connect Control Interface NMI: Network Management Interface OSPF: Open Shortest Path First CSPF: Constrained Shortest Path First

OCC

OCC

OCC OCC

OCC

Switch

Switch Switch

Switch

Switch

Management Plane

NMI-T

NMI-A

CCI

GMPLS

OSPF

CSPF


Three Connections

SC: Switched connection (SC) is a service connection requested by a

terminal user (router, for example) and then created in the ASON control plane through signaling. Currently, it is not supported.

PC: Permanent connection (PC) is a service connection calculated

beforehand and then created through the NM by issuing a command to NE.

SPC: Soft permanent connection (SPC) between the user and the

transmission network is configured directly by the NM. However, the connection within the transmission network is requested by the NM and then created by the NE’s control plane through signaling.


Three Connections -- SC

Control plane

Transport planeNE NE NE

SC

Connection end

Connection end

Setup request

Setup request

Setup request

A B

Connection request

Connection request

UNI

UNI


Three Connections -- PC

Management plane


PC

Connection end

Connection end

Allocation request

Allocation request

Allocation request

A B


Three Connections -- SPC

Control plane


SPC

Connection end

Connection end

Setup request

Setup request

A B

Management planeConnection request

SCPC PC


ASON SolutionCentralized ASON system

A

B C

D

E

Distributed ASON system

NMS

A

BC

D

E

ASON software

ASON software

ASON software

ASON software

ASON software

ASON software

NMS


Architecture of ASON NEArchitecture of ASON NE

Cross-Connect UnitCross-Connect Unit Line Line InterfaceInterface

Line Line InterfaceInterface

Management LinkTransport Link

Management LinkTransport Link

NMS

Communication and control Communication and control unit of NEunit of NE

Control LinkControl Link

Signaling ProtocolSignaling Protocol(RSVP-TE)(RSVP-TE)

Routing ProtocolRouting Protocol(OSPF-TE)(OSPF-TE)

Link Management Protocol (LMP)Link Management Protocol (LMP)

The NE with ASON function, which is based on the traditional network elements, has transplanted the intelligent software module.


Contents

ASON Architecture ASON Architecture

ASON Software Related Protocols


Contents

ASON Software Related Protocols ASON Standard Organizations

ASON Protocols


Focus on requirements and architecture, draw up ASON/ASTN.

GMPLS protocol, and finished RSVP-TE, CR-LDP, LMP, OSPF-TE, IS-IS.

Mainly focus on publishing Implementation Agreements, Inter-operability Demonstration:UNI-1.0, UNI-2.0, E-NNI.

ASON Standard Organizations


ITU-T ASONITU-T ASON FrameworkFrameworkG.807G.807

G.8080G.8080

G.7713G.7713 G.7714G.7714 G.7715G.7715 G.7716G.7716 G.7717G.7717G.7712G.7712

General requirement

Network framework

DCN

G.7713.1G.7713.1 G.7713.2G.7713.2 G.7713.3G.7713.3

Call connection management

Automatic discovery

G.7714.1G.7714.1

Routing Link management Connection probativecontrol

PNNI GMPLSRSVP-TE

GMPLSCR-LDP

Automatic discovery protocol base on SDH/OTN


IETF GMPLSIETF GMPLS FrameworkFramework

Draft-IETF-CCAMP-GMPLS-Architecture

RFC 3471 (GMPLS) Signaling Functional

Description

GMPLS Framework

Draft-IETF-CCAMP-LMP

Draft-IETF-CCAMP-LMP-WDM

Draft-IETF-CCAMP-GMPLS-Routing

Draft-IETF-CCAMP-OSPF-GMPLS-

Extensions

Draft-IETF-CCAMP-SDH/SONET-Control

RFC3472 (GMPLS) (CR-LDP) Extensions

RFC3473 (GMPLS) (RSVP-TE) Extensions

Draft-IETF-CCAMP-GMPLS-SONET-SDH

Draft-IETF-CCAMP-GMPLS-SONET-SDH-

Extensions

Signaling

Link management

Routing

SDH/SONET Support


OIF FrameworkOIF Framework OIF2000.155

OIF2000.125.07

OIF2002.229

OIF2003.179 OIF2002.378

OIF2002.023 OIF2002.163

OIF2003.248

OIF2003.293

UNI Requirement ENNI Requirement

UNI 1.0

UNI 1.0T2

UNI 2.0

ENNI 1.0 signaling regulation ENNI 1.0 layer routing

Base on OSPF layer routing

(DDRP)

Base on ISIS layer routing

• Huawei participated in the interconnect test of UNI 1.0 from OIF organization. • Huawei is participating in the research for cross-domain multi-layer routing.


Huawei’s Network Based on ASONHuawei’s Network Based on ASON

carry 1 carry 2 carry 3

External Data Link

Internal Data Link

Inside DomainI-NNI signalling: RSVP-TE

I-NNI routing: OSPF-TE

UNI

UNI

E-NNI

Domain1 Domain2

Between Domains E-NNI signalling: RSVP-TE E-NNI routing: DDRP

Between carries: E-NNI protocol: RSVP-TE E-NNI routing: BGP

E-NNI

UNI signalling: RSVP-TE


ASON Protocols GMPLS: In a broad sense, the multi-service label switching protocol provides the

functions of setting up, deleting and querying a connection, synchronization and restoration, rerouting protection. Moreover, it provides the service related functions.

OSPF-TE (routing):

Flood and gather topology for calculating service path

RSVP-TE (signaling):

Establish and then maintain the service path

LMP (link management):

Discover the neighbors and links


Relation Among the ASON Related Protocols

Neighbor discovery, error locating,

and link resource management

Link management protocol (LMP)

Flood, collect and compute

the routing resources

Routing protocols (OSPF,CSPF)

Automatically set up, delete and maintain fibers

Signaling protocol (RSVP-TE)Request for service path computation

Service link information

Control link information

Error locating information


LMP is a protocol used between ---- nodes.

LMP manages the fiber connections between neighbor

nodes.

LMP implements link resource discovery and management

function. Control Channel Management Data Link Connectivity Verification TE Link Parameter Correlation

LMP


Three links Control link

A control link is automatically discovered and maintained by the open shortest path first (OSPF). Each ASON NE floods its control links to the entire network. In this case, each NE can get the information about the control links in the entire network. Therefore, each NE can get the topology of the global control plane.

Data link Data links are classified into working links, protected links, and

unprotected links. The network management system does not present the concept of data link. A member like displayed in the network management system is a data link.

TE link TE link stands for traffic engineering link. An ASON NE uses the TE link

to transmit its information (for example, bandwidth) to other ASON NEs in the network. thus providing data for route computation. A fiber may contain multiple TE links.


Connectivity check of a data link between adjacent nodes can be conducted only after an available control channel is set up.

The LMP protocol describes the discovery and management of control channels.

Node AConfig

Config

ConfigAck/ConfigNack

Node B

A control channel transmits information through in-band (for example, through bytes D4-D12) mode or through out-band (for example, through Ethernet) mode.

The discovery and management functions of control channels are implemented by exchanging the Config messages and executing the keep-alive mechanism (by the Hello protocol).

Config


The LMP protocol describes the connectivity check of data links.

Node A Node B

Begin VerifyBegin VerifyAck

TestTestStatusSuccess

TestStatusAck...

End Verify

End VerifyAck

Check preparation: After transmitting the BeginVerify message,

node A successfully receives the BeginVerifyAck message.

Check process: Node A periodically transmits the Test

message over the data link till it receives the teststatussuccess or teststatufailure message over the control channel.

Check end: After transmitting the Endverify message, node

A waits for the EndVerifyAck message, and has received it. Alternatively, node A times out to receive the EndVerifyACK message. In this case, the check process ends.

Check each data link.

After successfully checking the connectivity of data links, you can check the consistency of TE link attributes.


The LMP protocol describes the consistency check of TE link attributes.

Node A Node BLinkSummary

LinkSummary/Ack/Nack

LinkSummary

LinkSummary

The consistency check function is used to check whether the interface mapping relation dynamically discovered or manually configured is consistent between two nodes.

If the interface mapping relation is consistent, the TE link changes to the UP status. In this case, the ASON routing module is informed that the TE link can be used to create an ASON service.

As the source of the TE LSA at the service plane on the routing module, a TE link is the prerequisite of creating the topology at the service plane.


Collecting and distributing network link information to generate the route Information of transport plane and control plane

Flooding and gathering topology for calculating service path

OSPF-TE


OSPF-TE--Working Mechanism

NodeID1

NodeID2

NodeID3

NodeID4

NodeID5

NodeID6Hello message

(Include Local Node ID)

LSA message

In-band control link D4-D12 or Out-band DCN


RSVP-TE is RSVP with traffic engineering extensions.

The functions of RSVP:

LSP establishment

LSP deletion

LSP attribute modification

LSP rerouting

LSP path optimization

RSVP-TE


Path message

Path message

Resv message

Resv message

Path message

Path message

Ack message

Ack message

Ack messageAck message

Ack message

Ack message

RSVP － LSP Establishment

Node A Node B Node C

Upward-Link

Downward-Link

Opening Alarm Monitoring


Path message

Path message

PathErr message

PathErr message

Ack message

Ack message

Ack message

Ack message

RSVP － LSP Deletion

Node A Node B Node C

closing Alarm Monitoring

LSP deletion


Questions:

Question 1: What are the standard organizations involved in ASON? What are the contributions made by each organization for ASON?

Question 2: What are the three key protocols involved in ASON? What are the functions provided in each protocol?


Summary

In this part, we have learned: ASON Architecture ASON Related Protocols and Their

Working Process


Contents ASON Overview ASON Architecture Key Functions of the ASON Typical ASON Networks and

Applications


Protection and Restoration Protection:

The protection function refers to protection switching here. Protection switching means that some network resources are particularly reserved for service protection before a fault occurs. After a fault occurs, the service traffic is switched from the faulty path to the protection path.

Restoration: The restoration function refers to rerouting here. Rerouting is a method for

restoring a service. When an LSP is interrupted, the ingress node of the LSP queries the optimal LSP route to restore a service. The signaling is transmitted to the download nodes hop by hop to request for reserving resources and setting up a cross-connection. The egress node returns signaling to the upstream nodes hop by hop. Finally, a new LSP is set up.

Differences: ◆ For the protection function, the services are restored

rapidly, and the protection resources need to be reserved. The resources are of low usage.◆ For the restoration function, the services are restored slowly, but the network resources are of high usage.

If no idle resources exist in the network, the services cannot be restored.

◆


Protection and Restoration

Rerouting

Concept: Rerouting is a key feature of a service. When a bottom-layer transmission path fails, the

service is interrupted. Then a request for re-setting up a route is transmitted to the control plane.

After receiving the request, the control plane queries another route and allocates resources to set

up a new route. After a route is set up successfully, the old route is deleted from the ingress node.

Protection types supported in ASON services

SNCP

MSP (1+1 linear MSP access, two-fiber MSP ring, four-fiber MSP ring)


Rerouting Trigger Conditions

Section-layer alarms: R_LOS, R_LOF, MS_AIS, MS_RDI, B2_SD and B2_OVER

Path alarm: AU_AIS

MSP switching failure

Analysis needs to be conducted according to the services of different levels.

Lock-related concepts Rerouting lock: Sometimes, the services do not need to be rerouted in the case of LSP

failure. In this case, you need to set the rerouting lock function. After the rerouting

function is locked, a service is not rerouted if the LSP fails.

Rerouting Priority Options are: High, low.


Five Types of SLA Services The ASON can provide services of different SLAs based on the requirements of the

customers. SLA stands for Service Level Agreement. It divides the services into multiple levels

in view of service protection.Diamond Level Golden Level Silver Level Copper Level Iron Level

Service level

Protection/restoration policy

Protection and Restoration

Protection and Restoration Restoration No-protection,

no-restoration Can be contended

Technology SNCP MSP Rerouting － MSP

Technical presentation

Permanent protection is provided if the network bandwidth is available.

The event is protection in most cases, but is restoration sometimes.

The path is computed in real time. The protection path does not need to be set in advance.

－After the route is contended, the service is interrupted. After the route is released, the service is restored.

Performance index

Service protection switching time: < 50 ms

Service protection switching time: < 50 ms. Service restoration time: < 2s

Service restoration time: < 2s －－

Bandwidth usage Low Middle High Very high Very high

Charging rate Very high High Middle Low

Applicable service

Banking, security, and dedicated lines of key government departments.

PSTN and GSM voice services

Ordinary customers, IP data service private line, Internet access service at cells.

Temporary service requirements

Temporary service requirements


Five Types of SLA Services -- Diamond Level Service

T2000 network management system

ASON NE User equipment

Working path

Protection path


Five Types of SLA Services -- Gold Level Service

VR MSP

Less than 50 ms

T2000 NMS

ASON NE

User equipment The protection function is enabled if a fault occurs on the same

virtual ring. The restoration function is enabled if two or more faults occur

on the same virtual ring.


Five Types of SLA Services -- Silver Level Service

T2000 NMS

ASON NE

User equipment Rerouting protection. The protection path is computed in real time. The switching time is from several hundreds of ms to a few seconds.

Revertive rerouting ensures that the silver service returns to the initially planned optimal path after the network is restored.


Five Types of SLA Services -- Copper Level Service

T2000 NMS

ASON NE

User equipment


Five Types of SLA Services -- Iron Level Service

VR MSP

Less than 50

ms

T2000 NMS

ASON NE User equipment

Gold level serviceIron level service


Tunneling Service (ASON Service CircuitTunneling Service (ASON Service Circuit))

R1

R2

R3

R4

A

BG

H

I

FC

DE

ASON NE

User equipment

The VC4 tunnel is used to carry the VC-12 service. Therefore, the VC-12 service can be configured in the ASON network.

When the VC-4 tunnel fails, the protection and restoration functions of the tunnel are enabled to protect and restore the VC-12 service.

When the tunneling service is switched for protection, the ASON software switches the tunnel, and the NE software switches the services at the two ends of the tunnel.


Tunneling ServiceFirst node Middle node Middle node End node

Add/drop service port

low-order cross-connection

High order cross- connection


Services AssociationServices Association

ASON NE

User equipment

T2000 NMS

Associated services

Protection against node failure

Provide the maximum protection for the services at the access side. The services can be protected if the service access node is powered off or down.


SRLG

SRLG stands for Shared Risk Link Group. Generally, a fiber in

the same cable shares the same risk. That is, if a cable is cut, all

the fibers in the cable are cut. An ASON service is not rerouted to

the link that has the same risk. Therefore, you need to correctly

set the SRLG for the link that has the same risk to ensure that the

two LSPs of the diamond service are not in the same cable.

Alternatively, the LSP of the rerouted ASON service is not the link

that has the same risk with the faulty link.


Network Traffic Equilibrium The CSPF algorithm is used to compute the optimal route in the ASON

network. When multiple LSPs exist between two nodes, possibly, several LSPs share the same route. This problem is avoided by the network traffic equilibrium function.

R1

R2R3

R4

A

B

C

D E

F

G H

I


Resource Reservation For an ASON NE, the NE software and ASON software

respectively manages its own timeslots. The ASON software manages the timeslots in which ASON services are created. These timeslots cannot be used for the NE software to create SDH services.

Concept:

Resource reservation means that commands are used to

reserve all or partial timeslots for the NE software to create SDH

services. Before being unreserved, these ASON software cannot

be used.


Service Path OptimizationService Path Optimization

The service is optimized.

ASON NE

User equipment

T2000 NMS

Link of which the capacity is expanded Online service optimization and adjustment: The carrier can optimize the

network topology, operate and maintain the service conveniently. Smoothly change the service path. You can optimize the service paths

without interrupting the services.


Service Path Restoration Function Description

When fibers are cut and restored for many times, the current service path may be different from the original one. In this case, the service path restoration function can be implemented to restore all or some of the services to the original paths.

A service path can be saved as an original path at any time according to requirements. Currently, a path can be restored at the fiber level only. Therefore, a path at the timeslot level cannot be

restored. Implementation Principle

The original service paths are stored in the ASON software. When you click the Global Service Restoration button, the network management system delivers the service indexes to the ASON module one by one. Then the ASON software takes an original path as the specified path to optimize the services one by one.

Restoration Mode Revertive mode: After being rerouted, a service returns to the original route after some wait-for-

restoration time if the original route is normal. Non-revertive mode: After being rerouted, a service does not return to the original route no matter the

working route is normal or not. Networkwide service path restoration: Press to restore the service path.


Migration from PC to SPCMigration from PC to SPC

PC SPC signaling

ASON NE

Not ASON NE

Implement the smooth conversion between traditional allocation services and ASON services to provide smooth evolution from SDH network to ASON network.

The network structure does not need to be changed. The services are implemented without impact. MSP service <-> Golden service, SNCP <-> Diamond service, Non-protected service <-> Golden service/Silver service/Copper service

T2000 NMS


FlexibleFlexible RoutingRouting PolicyPolicy

10G link

1000km8VC4s available

1000 km8 VC4s available




1500km4 VC4s available


2.5G link


Select the minimum number of nodes

T2000 NMS

ASON NE

User equipment You can adjust the weight of the three routing policy parameters (minimum number of nodes,

fiber distance, and available traffic bandwidth in the link) as required to obtain the optimal and expected path.


Concept Review

Protection and restoration

Five types of SLA services

Diamond level service

Gold level service

Silver level service

Copper level service

Iron level service


Concept Review

Tunneling service Services Association SRLG

Network traffic balancing Optimize the Service Path Service Path Restoration

Migration from PC to SPC Flexible Routing Policy

Resource reservation


Questions:

Question 1: What are the differences between protection and restoration?

Question 2: What are the services provided in the ASON network?

Question 3: What do you need to do if lower-order services are transmitted in the ASON network?


Summary

In this part, we have learned: Rich SLA functions ASON-related concepts


Contents


Applications


National Trunk of TELEMAR in BrazilNational Trunk of TELEMAR in Brazil

PARAIBA

RIO GRANDEDO NORTE

ALAGOASSERGIPE

SANTA CATARINA

RIO DE JANEIRO

ESP. SANTO

MINAS GERAIS

GOIAS

DISTRITOFEDERAL

TOCANTINS

PARANA

RONDONIA

MATO GROSSO

SÃO PAULO

BAHIA

CEARA

ACRE

RIO GRANDEDO SUL

PERNAMBUCO

RORAIMA

AMAPA

MATO GROSSODO SUL

PIAUI

PARAAMAZONAS

MARANHAO

★

★

★★

★

★

★★

• Telemar is the largest telecom carrier in Latin America. To solve the problems of network security, Telemar purchases the ASON equipment from Huawei.

• The OptiX OSN 9500 of Huawei, which is based on the ASON network, covers the top-7 important cities in Brazil to form a flexible mesh network, thus improving the reliability and flexible scheduling of the entire network.


Although the national optical cable trunk has Although the national optical cable trunk has been disconnected for seven times in Brazil, the been disconnected for seven times in Brazil, the services are not affected.services are not affected.

11

22

3344

55

66

77

The original path of the services is BHE-SDR-SGI-RCE.

BHE SGI

FLASDRSPO

RIO RCE


HubHub

QionghaiQionghai

SanyaSanya

HaifuHaifu

DanzhouAndingAnding

DengDengmaimai

WenchangWenchang

WanningWanning

LingshuiLingshui

BaishaBaisha

ChangjiangChangjiang

DongfangDongfangLedongLedong

ChongpoChongpo

QiongzQiongzhonghong

BaotingBaoting

WuzhisWuzhishanhan

TunchangTunchang

LingaoLingao

9500

350010G connection

Full mesh, strong survivability upon failure of multiple nodes, high network security Multiple types of service protection (for example, protection + restoration) improves the bandwidth usage.

Provincial Trunk of China Telecom Hainan Branch: Provincial Trunk of China Telecom Hainan Branch: Full Mesh Network Consisting of 21 Nodes Full Mesh Network Consisting of 21 Nodes


Ring 4

Ring 1 Ring 2

Ring 3

10G Ring Network Diagram for the 10G Ring Network Diagram for the Provincial Trunk of China Telecom Provincial Trunk of China Telecom Hainan BranchHainan Branch

Hub Haifu

Wenchang

Qionghai

Wanning

Lingshui

SanyaChongpoDongfang

Changjiang

Baisha

Danzhou

Lingao

Tunchang Anding

Tongshi

Baoting

Qiongzhong

Ledong

Dengmai

Two 10G ring networks and four 10G optical interfaces are provided in Sanya and Haikou. The maximum number of transmitted services is 4×5G = 20G =126VC4s.


10G Ring Network Analysis of the Provincial 10G Ring Network Analysis of the Provincial Trunk of China Telecom Hainan BranchTrunk of China Telecom Hainan Branch

For the traditional ring network scheme, bottlenecks exist on the kernel nodes: Sanya and Haikou.

At the early stage, no problems occur in the 155M service. For the GE

services in the future, 10 VC4s cannot meet the requirements. The total

bandwidth of the 155M and GE services is 136 VC4s at the two egress

interfaces. At most 2x64=126 VC4s can be provided for the current

configuration of the two 10G rings. Therefore, about 10 VC4 services cannot

be satisfied in the current 10G ring network.

In the ASON network, you do not need to reserve 50% bandwidth in each direction. In the four optical directions, 10x3/4x4 =30G = 192VC4s can be transmitted.


Questions:

Question 1: What are the most important advantages of the ASON network for the services according to the case analysis?

Question 2: What are the structure differences between the ASON network and the SDH network?


Summary

In this part, we have learned: ASON Network Applications and Analysis

National Trunk of TELEMAR in Brazil

Provincial Trunk of China Telecom Hainan Branch


Summarize

In this course, we have learned: ASON Overview ASON Architecture Key functions of the ASON Typical ASON Networks and Applications


GlossaryGlossary

ASON: Automatically Switched Optical Network

OSPF: Open Shortest Path First

CSPF: Constrained Shortest Path First

LMP: Link Management Protocol

RSVP-TE: Resource Reserved Protocol-Traffic Engineering


GlossaryGlossary

UNI/NNI: User-Network Interface/Network-Network Interface BGP: Border Gateway Protocol DDRP: Domain-Domain Route Protocol SLA: Service Level Agreement LSA: Label Status Advertisement LSP: Label Switching Path

Thank Youwww.huawei.com

principles of the optix ason (osn)

Documents