ASON Protocol

Security Level: Internal Use Only

2007-6-4

Explanations to OptiX ASON Protocols

www.huawei.com

HUAWEI TECHNOLOGIES TECHNOLOGIES Co., Ltd.

HUAWEI Confidential Confidential

Contents ASON

Principle Review

Explanations to the LMP Protocol Explanations to the RSVP Protocol

HUAW EI TECHNOLOGIES CO., LTD.

HUAW EI Confidential

Page 2

NMS



Switched Optical Network, Requirements defined by ITU-T. GMPLS: Generalized MultiProtocol Label Switching, A series protocols (LMP, RSVP-TE, OSPF) defined by IETF.



ASON/GMPLS



MP (Manage Plane)

Network Management Interface

OCC

CP

NMI

NMI

OCC

(Control Plane)

OCC

OCC

ASON: Automatic

NNI

OCC





Introduces control plane to ON. It s the first time to adopt dynamic switching function. Distributed control plane is the trend. 

Connection Control Interface

TP

CCI

CCI

(Transport Plane) NE

NE

NE

NE


NE


Page 3

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



Page 4

Relation Among the

ASON

Routing protocols (OSPF,CSPF) Flood, collect and compute

Related Protocols Signaling protocol (RSVP-TE)

Request for service path computation

Automatically

the routing resources Service link information

Error locating information

set up, delete and maintain fibers

Control link information

Link management protocol (LMP)

Neighbor discovery, error locating, and link resource management



Page 5

Contents ASON

Principle Review




Page 6

Explanations to the LMP Protocol  Control Channel Check Process 

Data

Link Check Process

 TE Link Check Process



Page 7

Explanations to LMP ± Control Channel Check Process  Control Channel Management ¾

Function » Set up and maintain control channels between nodes.

¾

Implementation mode » Inter-Node config message switching and a fast keep alive mechanism

¾

Control channel management contains the following contents: » Setup of control channels » Fast keep alive process » Disabling of control channels



Page 8

Explanations to LMP ± Control Channel Check Process 

A

Case of the Setup Process of a

Control Channel ¾

Setup a Control Channel between Node A and Node B

information from Node B:

Config Config Config

The ConfigAck message indicates that

Config

Node A sends a Config message to Node B.

¾ ¾

If Node A receives the following

the control channel is set up; ¾

ConfigAck/ConfigNack

If Node A receives the following information from Node B:The ConfigNAck message indicates that parameter negotiation fails.The control

Node A

Node B

channel is not set up.



Page 9

Explanations to LMP ± Data Link Connectivity Check Data Link Connectivity Check  Preparations for the check: ¾

Node A sends BeginVerify and receives the BeginVerifyAck message.

 Check process ¾

Node A keeps sending the Test message on the data link at specific time until it receives teststatussuccess or teststatufailure response on the control channel.

 Check end ¾

between Node A and Node B Begin Verify Begin VerifyAck Test TestStatusSuccess TestStatusAck Test TestStatusSuccess TestStatusAck

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.

...

End Verify End VerifyAck

NodeA HUAW EI TECHNOLOGIES CO., LTD.


NodeB Page 10

Connectivity Check

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

Analysis

¾

on consistency check process of the TE link

Node A launches the check process by sending the LinkSummary message regularly.

¾

If Node A receives the LinkSummaryAck message, the consistency check succeeds¶ if Node A receives the LinkSummaryNack message, the consistency check fails. TE Link Consistency Check between Node

A

and Node B

LinkSummary LinkSummary LinkSummary LinkSummary LinkSummaryAck Node A HUAW EI TECHNOLOGIES CO., LTD.

Node B HUAW EI Confidential

Page 11

Contents ASON

Principle Review




Page 12

Explanationss to the RSVP Protocol  Resource reservation protocol (RSVP)



Page 13

Explanations to RSVP ± Service Setup Process

Path Resv Resv



Path

Page 14

Explanations to RSVP ± Service Setup Process Primary node

intermediate node

intermediate node

end node

Path message (new) Ack

Path message (new)

Ack

Path message (new)

Resv(with Ack) Ack

Resv Resv

Ack

Ack Path message (enable alarm monitor ) Ack

Path message (enable alarm monitor)

Ack

Path message (enable alarm monitor)

Resv(with Ack)

Resv Resv

Ack

Ack

Ack



Page 15

Explanations to RSVP ± Service Deletion Process Primary node

Middle node

Middle node

End node

Start DIP Timer Path message (close ALARM monitor)

Ack

Path message (close ALARM monitor) Path message (close ALARM monitor)

Ack Graceful deletion

PathErr(with Ack) Ack Release resource

PathErr PathErr Release resource

Ack

Ack

Release resource

Release resource

Stop DIP Timer DIP Timer Expired PathTear Release resource Ack Forced deletion


PathTear Release resource Ack

PathTear Release resource Ack


Page 16

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.



Page 17

Thank You www.huawei.com

ASON Protocol

Recommend Documents