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HUAWEI TECHNOLOGIES Co., Ltd.
www.huawei.com
HUAWEI Confidential
Security Level: Internal Use Only 2007-6-4
Explanations to OptiX ASON Protocols
HUAWEI TECHNOLOGIES CO., LTD. Page 2HUAWEI 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
HUAWEI TECHNOLOGIES CO., LTD. Page 3HUAWEI Confidential
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
HUAWEI TECHNOLOGIES CO., LTD. Page 4HUAWEI Confidential
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
HUAWEI TECHNOLOGIES CO., LTD. Page 5HUAWEI Confidential
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
HUAWEI TECHNOLOGIES CO., LTD. Page 6HUAWEI 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
HUAWEI TECHNOLOGIES CO., LTD. Page 7HUAWEI Confidential
Explanations to the LMP Protocol
• Control Channel Check Process
• Data Link Check Process
• TE Link Check Process
HUAWEI TECHNOLOGIES CO., LTD. Page 8HUAWEI Confidential
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
HUAWEI TECHNOLOGIES CO., LTD. Page 9HUAWEI Confidential
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
HUAWEI TECHNOLOGIES CO., LTD. Page 10HUAWEI Confidential
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
HUAWEI TECHNOLOGIES CO., LTD. Page 11HUAWEI Confidential
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
HUAWEI TECHNOLOGIES CO., LTD. Page 12HUAWEI Confidential
ASON Principle ReviewASON Principle Review
Explanations to the LMP ProtocolExplanations to the LMP Protocol
Explanations to the RSVP ProtocolExplanations to the RSVP Protocol
ContentsContents
HUAWEI TECHNOLOGIES CO., LTD. Page 13HUAWEI Confidential
Explanationss to the RSVP Protocol
• Resource reservation protocol (RSVP)
HUAWEI TECHNOLOGIES CO., LTD. Page 14HUAWEI Confidential
Explanations to RSVP – Service Setup Process
Path
PathResv
Resv
HUAWEI TECHNOLOGIES CO., LTD. Page 15HUAWEI Confidential
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)
HUAWEI TECHNOLOGIES CO., LTD. Page 16HUAWEI Confidential
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
Path message (close ALARM monitor)
Path message (close ALARM monitor)
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
HUAWEI TECHNOLOGIES CO., LTD. Page 17HUAWEI Confidential
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
www.huawei.com