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Overview of MS-SPRing and GMPLS

Multiplex Section - Shared Protection Ring

Prepared by:

Diego Caviglia [email protected]

Huub van Helvoort [email protected]

Background reading: draft-caviglia-gmpls-msspring-req

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Overview of MS-SPRing - Introduction

Multiplex Section - Shared Protection Ring MS-SPRing

Protects the multiple sections !lines" in a ring con#iguration.

$%#iber sections

&%#iber sections

'he protection capability o# the ring is shared

(# no protection re)uired it can be used #or etra tra##ic

'he si*e around the ring is e)ual to largest +orkingcapability on any section o# the ring

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Overview of MS-SPRing - MS-SPRing2-fiber

A

working traffic

protecting traffic

B C

DEF

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A B C

DEF

working traffic

protecting traffic

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A B C

DEF

working traffic

protecting traffic

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Overview of MS-SPRing - MS-SPRing4-fiber(ring-switching)

A B C

DEF

working traffic

protecting traffic

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Overview of MS-SPRing - MS-SPRing4-fiber(ring-switching)

A B C

DEF

working traffic

protecting traffic

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Overview of MS-SPRing - MS-SPRing4-fibertransoceanic (ring-switching)

A B C

DEF

working traffic

protecting traffic

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Overview of MS-SPRing - MS-SPRing4-fiber(span-switching)

A B C

DEF

working traffic

protecting traffic

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Overview of MS-SPRing - MS-SPRing4-fiber(span-switching)

A B C

DEF

working traffic

protecting traffic

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Overview of MS-SPRing - Provisioning

Ring topology: every node in the ring is assigned a uni)ueidenti#ier;

,sed by the -P protocol

Traffic matrix: represents the allocation o# transport entitiesin the ring;

,sed to determine re)uired protection capability

Squelching map: represents the connection matri o# the

ring/ ,sed to prevent mis%connections in case o# ring node

#ailure0isolation

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How does this relate to GMPLS?

GMPLS provides ideally arobust and fexible control planeprotocols set designed for application over generalied transportnetwor!;

" typicalapplication of GMPLS is# among others#the control otransport networks based on SDH/SO!" technolo#$;

"he t$pical SDH/SO!" network topolo#$ is %ade b$

interconnected rin#s;$ the main protection scheme for interconnected rings is MS&SP'in#%

(suall$ network operators)

$ Don*t want to dis%iss protectionscheme they are &sed to%

$ 'ants to sell hi#h +alue ser+icesthat need recovery time# at least for the(rst fail&re# in order of milliseconds )e*g* +, ms%

.n this scenario# the introd&ction ofGMPLS based control planeshould ensure support o and/or co%patibilit$ with the %osti%portant and widel$ exploited SDH/SO!" eatures, ma!ingpossi/le a seamless interwor!ing with inherent data planereq&irements*

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'hat signaling0ro&ting pro/lems arise?

.n general# when setting &p and con(g&ring a dataplane circuit tra+ersin# a MS&SP'in# rin#)orsegments of it via traditional management planecontrol# special constraints# which are speci(c tothis !ind of technology# ha+e to be consideredin

order to ens&re its correct operation; 1he sa%e constraintshave to /e caref&lly ta!en

into acco&nt when the data plane circ&it is no moreset &p in a traditional way# /&t throu#h a GMPLSbased control plane;

"he speci-c constraintsimposed /y MS-SPRingare related to)

$ "i%e Slot .nterchan#e)1S.

$ Ring Map (lling in case of suelchin#

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'hat signaling0ro&ting pro/lems arise? - 1S.

1S. is the connection unction capabilit$of changingthe time slot position of thro&gh-connected tra2c )i*e*tra2c that is not added or dropped from the node%

"t present there isno "S. capabilit$ speci-ed innodes belon#in# to a MS&SP'in# sub network;

0hannels at MS&SP'in# node*s e#ress are nailedto the sa%e ti%eslot used b$ the sa%e channelsat node*s in#ress;

1ro% a 0ontrol Plane point o +iew that %eansthat 'in# .n#ress ode 2-rst ode o the LSP thatis also part o a MS&SP'in#3 should know inad+ance witch labels 2"i%eslots3 are ree on therin# or so%e crankback %echanis% should bei%ple%ented inside the rin#4

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'hat signaling0ro&ting pro/lems arise? -Sq&elching

Sq&elching is de(ned as theprocess o insertin#5(&5.S in order to pre+ent %isconnections;

1he sq&elching process application over tra2cres&lts in anall 6*s si#nal;

.n order to perform sq&elchingeach "!s in therin# should know, or e+er$ LSP, wich "! is'in# .n#ress and witch one is 'in# !#ress;

3rom a 4ontrol Plane point of view that means thatdurin# the LSP set the abo+e inor%ation is

distributed a%on# the "!s that are tra+ersedb$ the LSP4

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'hat signaling0ro&ting pro/lems arise? 5 6ataPlane 4ontrol Plane misalignment

Before failures 'he 1P goes through -2 B2 C and D/ 'he data tra##ic goes through -2 B2 C and D/

fter failure 'he 1P goes through -2 B2 C and D/ 'he data tra##ic goes through -2 B2 -2 32 42 D2 C and D

!ontrol Plane "eeds to #e re-aligned $ith data plane

A

B

C

D

E

F

A

B

C

D

E

F

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