odc010007 mpls te overview issue1_0
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Internal
ODC010007 MPLS TE
overview
ISSUE 1.0
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MPLS (Multiprotocol Label Switching)
has been successfully configured and
applied in a number of large network.MPLS TE is a perfect combination
technology of MPLS and TE, with best
resources architecture and most
resources usage percentage.
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References
l VRP5 operation manual MPLS
chapter
l MPLS TE user guide!
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Upon completion of this course, you will be
able to:
[ Be known detailed TE concepts and
models
[ Be known MPLS technology specifics
and priorities
[ Master MPLS TE background and
function module
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Chapter 1 What is TEChapter 1 What is TE
Chapter 2 MPLS introductionChapter 2 MPLS introduction
Chapter 3 MPLS TEChapter 3 MPLS TE
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Chapter 1 What is TEChapter 1 What is TE
1.1 What is TE1.1 What is TE
1.2 TE before MPLS1.2 TE before MPLS
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Concept of TE
l Two engineering concepts appear accompany with the growth of
network size:
[ NE (Network Engineering)
NE is the process of how to plan, design and implement a
network to satisfy the real traffic requirements. First real traffic
requirements, then network design and implementation.
[ TE (Traffic Engineering)
TE is the process of how to configure and implement the
already exists network equipments to make the traffic beennormally transmitted. First exists network equipments, then
reconfigure them.
NE (Network Engineering) and TE (Traffic Engineering)
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What is TE
l !Traffic Engineering is the process of controlling
how traffic flows through one"s network so as to
optimize resource utilization and networkperformance#"
(Global Crossing, IEEE)
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Why we need TE
A major goal of Internet Traff ic Engineeri ng is to facil itate eff icient and
reliable network operations whiles simultaneously optimizing network
resource uti l ization and performance.
#RFC 2702 Requirements for Traffic Engineering over MPLS$
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Why we need TEcont.!
l Reduce OPEX costs through more efficient bandwidth
usage
l
Avoid possible part link busy or empty throughappropriate rearranging traffic
l Make the best network resources usage and improve
network performance through good redesigning traffic
TE target
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TE performance
l TE performance consists of two parts%
[ Performance oriented services: enhanced services QoS
performance. i.e. effect to packet loss, latency, throughput and
SLA#Service Level Agreement$
[ Performance oriented resources: optimize resources usage.
Bandwidth is precious resource, to arrange them efficiently is the
core target of TE
performance
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Chapter 1 What is TEChapter 1 What is TE
1.1 What is TE1.1 What is TE
1.2 TE before MPLS1.2 TE before MPLS
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Earlier TE introduction
l TE is not the result of MPLS, it is general technology project
l Before MPLS TE, technology mainly used to generate TE are:
[ ATM TE
[ IP TE
ATM TE and IP TE
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IP TE
l IP TE can be easily used without much detailed technology
l IP TE cannot control transmission path based on traffic sources,
but on destination forwarding
l IP TE mainly change special link cost value of IGP metric to
control traffic
IP TE
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IP TE"fish problem
R2
R8
R1
IP routing: destination-based shortest path route
under-utilized alternate path
Path for R2-R3-R4-R5-R8 traffic
Path for R1-R3-R4-R5-R8 traffic
l All traffic from R1 or R2 will select R3-R4-R5 path arriving R8
R3
R4
R5
R6 R7
1010
10
10
10
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IP TE"fish problem
l Change R3-R6-R7-R5 cost value, all traffic from R1 or R2 will shift on it
R2
R8
R1
under-utilized alternate path
Path for R2-R3-R6-R7-R8 traffic
Path for R1-R3-R6-R7-R8 traffic
R3
R4
R5
R6 R7
1010
5
5
5
IP routing: destination-based shortest path route
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IP TE weakness
l It is far less enough that calculate path only based on IGP metric value,
instead of considering bandwidth, link properties and others factor
l IP TE is essentially destination-based forwarding technology, it is hop-by-
hop forwarding, can not control traffic by sources
l IP TE is connectionless-oriented, can not support Explicit Routing
IP TE weakness
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ATM TE
l ATM TE mainly generated by PVC through traffic source to traffic
destination
l ATM TE is connection-oriented, can be well and easily done to arrange
traffic flow and put QoS
l ATM TE is necessarily applied in full-mesh network, which exists of O#N$$
problem, results in bad extensibility
l ATM TE is end-to-end TE, not so as to IP TE hop-by-hop
ATM TE
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ATM TE"Overlay Solution
l Physical architecture: Layer 2#ATM/FR$ built base on ATM TE
l Logically: the full-mesh network consists of all Layer 3#Routers$
equipments, in this network, each router has unique VC connected with anyother router
L3L3
L3L3
L3L3
L3L3
L3L3
L3L3
L3L3
L2L2
L2L2
L2L2
L2L2
L2L2
L2L2
L3L3
L3L3
L3L3
L3L3 L3L3
Physical Logical
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ATM TE weakness
l In case of carry out ATM TE in traditional IP network, telecom operator
need to buy new ATM/FR equipments, it will increases OPEX costs in a
large scale
l ATM TE will bring extra and more complex network management costs
[ Two layer network: ATM and IP equipments are difficult to manage
together
[ Different equipment will bring extra training works, technique support
works, and project implement works
l
Full-mesh network architecture exists of O#N$$ problem, bad extensibility
l IP over ATM will results in extra Cell Tax
ATM TE weakness
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Question
l IP TE and ATM TE have their superiority and inferiority
respectively, how can we do to keep superiority and to
discard inferiority
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Chapter 1 What is TEChapter 1 What is TE
Chapter 2 MPLS introductionChapter 2 MPLS introduction
Chapter 3 MPLS TEChapter 3 MPLS TE
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Chapter 2 MPLS introductionChapter 2 MPLS introduction
2.1 MPLS basis2.1 MPLS basis
2.2 MPLS superiority2.2 MPLS superiority
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MPLS basis
l In MPLS network, the IP packet is added with one or more MPLS header at
the length of 32 bits
l
MPLS is a concept between OSI layer 2 and layer 3 which can supportvariety of network protocol (IPV4/IPV6/ATM/FR)
l Earlier MPLS technology intent is improving router forwarding speed
MPLS packetMPLS packet
IP Packet
32-bit
MPLS Header
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MPLS basiscont.!
l 20 bits label, mapping traffic into LSP, in the range of 16-1,000,000
l EXP consists of 3 bits, indicate MPLS QoS
l S has only 1 bit, indicate the last label in the label queue
l TTL has the same function as IP has, the purpose is inspecting and avoiding
generating routing loop in Frame mode
MPLS headerMPLS header
TTLLabel EXP S
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Chapter 2 MPLS introductionChapter 2 MPLS introduction
2.1 MPLS basis2.1 MPLS basis
2.2 MPLS superiority2.2 MPLS superiority
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MPLS superiority
l MPLS technology use fixed length label searching instead of traditional
IP routing longest match search method, rapidly improve forwarding
speed, this is the beginning MPLS intension
l MPLS can combine IP and ATM well, save extra cell tax of IPOA
l MPLS true superiority is to provide variety of value-added service:
[ MPLS VPN
[ MPLS QoS
[ MPLS Traffic Engineering
MPLS superiorityMPLS superiority
Network goingdirection
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Chapter 1 What is TEChapter 1 What is TE
Chapter 2 MPLS introductionChapter 2 MPLS introduction
Chapter 3 MPLS TEChapter 3 MPLS TE
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Chapter 3 MPLS TEChapter 3 MPLS TE
3.1 MPLS TE development3.1 MPLS TE development
3.2 MPLSTE necessary condition3.2 MPLSTE necessary condition
3.3 MPLSTE elements3.3 MPLSTE elements
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MPLS TE development
l In Sept, 1999, RFC 2702#Requirements for Traffic Engineering Over
MPLS$give detailed necessary conditions of building network based
on MPLS TE, make a good fundamental for MPLS TE development
and application
l Since TE is a global complex system project, generating and
implementation is fairly difficult, nowadays, only small number of
network provider can provide scaleable application
l MPLS TE is a perfect combination of MPLS and TE, which is definite
trend of large scale network provider building core network andbackbone
MPLS TE developmentMPLS TE development
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MPLS TE realization method
l Nowadays main MPLS TE realization method:
[ RSVP-TE
RSVP-TE technology is mature, has been scaleable applied, but
too complex and bad extensibility
[ CR LDP-TE
CR LDP-TE technology is not very mature, rarely applied, but
simple, good extensibility
[ RSVP-TE is widely and mainly used
MPLS TE realization methodMPLS TE realization method
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Chapter 3 MPLS TEChapter 3 MPLS TE
3.1 MPLS TE development3.1 MPLS TE development
3.2 MPLSTE necessary condition3.2 MPLSTE necessary condition
3.3 MPLSTE elements3.3 MPLSTE elements
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MPLS TE necessary condition1!
l Support creating end-to-end LSP-based tunnel
l Support tunnel preempt function by different priority
l Support failure inspection switch function, when one link or node
fail, the other can quickly take over
l Support pre-creating backup LSP
MPLS TE necessary conditionMPLS TE necessary condition
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l Support LSP tunnel auto re-optimize by the change of network
resource
l Support LSP tunnel bandwidth auto adjustment by the change
of network bandwidth
l Support explicit path, can be set include or exclude node by
field requirement
l Support priority LSP tunnel, different priority traffic will input into
different tunnel respectively with DiffServ
MPLS TE necessary condition2!
MPLS TE necessary conditionMPLS TE necessary condition
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Chapter 3 MPLS TEChapter 3 MPLS TE
3.1 MPLS TE development3.1 MPLS TE development
3.2 MPLSTE necessary condition3.2 MPLSTE necessary condition
3.3 MPLSTE elements3.3 MPLSTE elements
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MPLS TE four elements
l MPLS TE four elements:
[ Information distribution
[ Path calculation
[ Signaling#or path setup$
[ Packet forwardingl Four elements can guarantee basic traffic forwarding, but not very
accurate
l MPLS TE also support some high level specification
[ FRR#Fast Reroute$
[ Tunnel backup
[ Auto Bandwidth Allocation
[ Path Re-optimum
MPLS TE four elementsMPLS TE four elements
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l TE is separate from MPLS essentially, the
original intent is well utilize whole network
resources
l MPLS is a combination of IP and ATM both
superiority, can provide variety ofapplications, i.e. MPLS VPN, MPLS TE
l MPLS TE is perfect combination of MPLS
and TE technology, can make network
resources well optimized, improve network
performance
SummarySummary
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www.huawei.com
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