ASON Protocol

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HUAWEI Confidential

Security Level: Internal Use Only 2007-6-4

Explanations to OptiX ASON Protocols

HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential

ASON Principle ReviewASON Principle Review

Explanations to the LMP ProtocolExplanations to the LMP Protocol

Explanations to the RSVP Explanations to the RSVP ProtocolProtocol

ContentsContents


CP(Control Plane)

TP(Transport

Plane)

CCI

NMI

NNI

CCI

NMI

ASON/GMPLS Introduces control plane to ON.

It’s the first time to adopt dynamic switching function.

Distributed control plane is the trend.

Network Management Interface

MP(Manage Plane)

ASON: Automatic Switched Optical Network, Requirements defined by ITU-T.

GMPLS: Generalized Multi-Protocol Label Switching, A series protocols (LMP, RSVP-TE, OSPF) defined by IETF.

NENE

NENE NE

OCCOCCOCCOCC

OCCOCC OCCOCCOCCOCC

Connection Control Interface

NMSNMS


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




Explanations to the RSVP Explanations to the RSVP ProtocolProtocol

ContentsContents


Explanations to the LMP Protocol

• Control Channel Check Process

• Data Link Check Process

• TE Link Check Process


Explanations to LMP – Control Channel Check Process

• Control Channel Management› Function

» Set up and maintain control channels between nodes.

› Implementation mode

» Inter-Node config message switching and a fast keep alive mechanis

m

› Control channel management contains the following contents:

» Setup of control channels

» Fast keep alive process

» Disabling of control channels


Explanations to LMP – Control Channel Check Process• A Case of the Setup Process of a C

ontrol Channel

› Node A sends a Config message to Node

B.

› If Node A receives the following informati

on from Node B:

› The ConfigAck message indicates that th

e control channel is set up;

› If Node A receives the following informati

on from Node B:The ConfigNAck messag

e indicates that parameter negotiation fail

s.The control channel is not set up.

Setup a Control Channelbetween Node A and Node B

Node A Node B

ConfigConfig

Config

ConfigAck/ConfigNack

Config


Explanations to LMP – Data Link Connectivity Check

• Preparations for the check:› Node A sends BeginVerify and receiv

es the BeginVerifyAck message.

• Check process› Node A keeps sending the Test mess

age on the data link at specific time until it receives teststatussuccess or teststatufailure response on the control channel.

• Check end› Node A sends the Endverify message

and waits for the response. After Node A receives the EndVerifyAck message or the response times out, the check process ends.

Test

NodeA NodeB

Begin Verify

Begin VerifyAck

TestStatusSuccess

TestStatusAck

...End Verify

End VerifyAck

Connectivity Check

Test

TestStatusSuccessTestStatusAck

Data Link Connectivity Check

between Node A and Node B


Explanations to LMP – Attribute Consistency Check of TE Link (Example)

• Analysis on consistency check process of the TE link

› Node A launches the check process by sending the LinkSummary message regularl

y.

› If Node A receives the LinkSummaryAck message, the consistency check succeed

s’ if Node A receives the LinkSummaryNack message, the consistency check fails.

TE Link Consistency Check between Node A and Node B

Node A Node B

LinkSummary

LinkSummary

LinkSummary

LinkSummaryAck

LinkSummary




Explanations to the RSVP ProtocolExplanations to the RSVP Protocol

ContentsContents


Explanationss to the RSVP Protocol

• Resource reservation protocol (RSVP)


Explanations to RSVP – Service Setup Process

Path

PathResv

Resv


Explanations to RSVP – Service Setup Process

Primary node

intermediate node

end node

Path message (new)

intermediate node

Path message (new)

Ack

Ack

Path message (new)

Resv(with Ack)

AckResv

AckResv

Ack

Path message(enable alarm monitor)

Ack

Resv(with Ack)

AckResv

AckResv

Ack

Path message(enable alarm monitor)Ack Path message

(enable alarm monitor)


Explanations to RSVP – Service Deletion Process

Primary node Middle node End nodeMiddle node

Ack

Ack

PathErr(with Ack)

Ack

Path message (close ALARM monitor)

Ack

Release resource



PathErr

Ack Release resourcePathErr

Ack Release resource

Start DIP Timer

Stop DIP Timer

Release resource

PathTear

DIP Timer Expired

Release resource

Ack

PathTearRelease resource

Ack

PathTearRelease resource

Graceful deletion

Forced

deletion


Explanations to the RSVP Protocol-Summary of General Knowledge

• For LSP setup, deletion, rerouting, optimization or attribute change,

the initiating node is the primary node of the service. The

intermediate node and end node are passive. When they receive the

message from the upstream node, they perform relevant operations.

Thank You

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ASON Protocol

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