ota058003 rsvp-te protocol introduction issue1.00
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8/12/2019 OTA058003 RSVP-TE Protocol Introduction ISSUE1.00
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Internal
OTA058003 RSVP-TE Protocol
Introduction
ISSUE 1.00
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Upon completion of this course, you will
be able to:
Understand the development of
RSVP protocol
Grasp the implementation
procedure of RSVP
Know the limitation of RSVP
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Chapter 1 Overview of RSVP protocol
Chapter 2 RSVP protocol introduction
Chapter 3 RSVP protocol application
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Overview
RSVP-TE:
Resource Reservation Protocol – Traffic Engineering is used to
denote the extensions of RSVP
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Demand
ASON need to provide automatic service establishment and
maintenance.
OSN equipment adopt RSVP-TE protocol to fulfill the procedure
of signaling.
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Development
RSVP
RSVP-TE
Extensions to
RSVP-TE
Extensions toRSVP-TE
QOS MPLS GMPLS OSN
RSVP: Resource Reservation Protocol
RSVP-TE: Resource Reservation Protocol - Traffic Engineering
MPLS: Multi-Protocol Label Switching
GMPLS: Generalized Multi-Protocol Label Switching
OSN: Optical Switch Node
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Chapter 1 Overview of RSVP protocol
Chapter 2 RSVP protocol introduction
Chapter 3 RSVP protocol application
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Features
RSVP is a signaling protocol.
Using RSVP, a source IP host (sender) sends a message to a uni-
cast or a multicast IP destination indicating the characteristics of
the traffic it will generate.
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LSP Creation Procedure（RSVP-TE）
Path Mess Path Mess Path Mess
Resv MessResv MessResv Mess
Completed Me tooCreate inverse
directionservice
Create VC4Service
Order oneVC4 of one
portOrdered too
Cross-connectcreated, notethe source
A B C D
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RSVP-TE
LSP establishing procedure
A B C
PATH mess
PATH mess
RESV mess
RESV mess
PATH mess
PATH mess
ACK mess
ACK mess
ACK mess
ACK mess
ACK mess
ACK mess
Upward-Link
Downward-Link
Opening Alarm Monitoring
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RSVP-TE
LSP deletion procedure
A B C
PATH mess
PATH mess
PATH ERR mess
PATH ERR mess
ACK mess
ACK mess
ACK mess
ACK mess
LSP deletion
Closing Alarm Monitoring
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Three Reservation Styles
Fixed Filter (FF) Style
Wildcard Filter (WF) Style
Shared Explicit (SE) Style
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Messages
Path and the Resv:
Used to establish reservations for a session.
PathTear and ResvTear:
Used to delete the session state (and the reservation).
PathErr and ResvErr:
Error notification messages.
ResvConf:
Sent to a receiver to confirm a reservation
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Messages
Path:Path message is sent follows the normal route from thesender to the receiver . It will create Psb in the intermediate nodes.
Resv:The Resv message is sent from the receiver to the
sender carrying thesource reservation request to create Rsb in
the intermediate nodes.
A B CPATH
PATH
RESV
RESV
PATH
PATH
ACK
ACK
ACK
ACK
ACK
ACK
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Messages
PathErr: The PathErr message is sent from an intermediate routerto the sender using the previous hop information to indicate error
conditions.
ResvErr: The ResvErr is sent from an intermediate router to
the receiver to indicate error conditions.
A B CPATH
PATH
PATH ERR
PATH ERR
ACK
ACK
ACK
ACK
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Messages
PathTear:
The PathTear message is addressed to the receiver of the data flow
to delete the Path state and Resv stateof a session.
ResvTear:
The ResvTear is transmitted hop by hop. The reception of a
ResvTear by a node results in the removal of the Resv state for
the session.
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Chapter 1 Overview of RSVP protocol
Chapter 2 RSVP protocol introduction
Chapter 3 RSVP protocol application
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RSVP-TE Application
The usage of the Path and Resv messages to request and assign
labels for LSP establishment
The ability to specify an explicit route when establishing or rerouting
an LSP
The ability to specify bandwidth and other parameters when
establishing an LSP
The ability to associate related LSPs
A new Hello protocol for maintaining the adjacency between RSVP
peers
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RSVP-TE Features
Address Analysis
Rapid Re-transmit
Confirm Mechanism
Soft State Refresh Mechanism
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Rapid Re-transmission
Rapid re-transmission is used to ensure the success of messagetransmission.
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Confirm Mechanism
Two kinds of confirm messages:
Carried message: the MESSAGE_ID_ACK object is carried by
the other messages.
Generated message : The MESSAGE_ID_ACK object is carried
by the ACK message which is generated directly when there is
no other message.
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Soft State Refresh
In the case of RSVP, the refresh message adapted to route changes,
that is, a Path refresh message is sent to the current next hop
toward the destination.
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Questions
How many kinds of messages can RSVP-TE protocol provide,
and their functions?
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