basic principle and configuration guide for zxctn linear and pw protection_r1[1].0

8/11/2019 Basic Principle and Configuration Guide for ZXCTN Linear and PW Protection_R1[1].0

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Basic principle andconfiguration guide for ZXCTN

linear and PW protection

R1.0



Basic principle and configuration guide for ZXCTN linear and PW protection Internal UseOnly▲

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Re%ision &istor'

Product (ersion )ocu*ent (ersion +erial Nu*,er Reason for Re%ision

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pplica,le to/TN commissioning engineer

Proposal/ Before reading t-is docu*ent 'ou -ad ,etter -a%e t-e folloing noledge and

sills.

+E2 3noledge and sills Reference *aterial

1 PTN O(2 -asic principle 《T2P34 O(2》

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"ollo4up docu*ent/ fter reading t-is docu*ent 'ou *a' need t-e folloing

infor*ation

+E2 Reference *aterial !nfor*ation

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,out T-is )ocu*ent

+u**ar'

C-apter )escription

1 ZXCTN protection introduction !ntroducing t-e t'pes of ZXCTN protection in detail

5 Configuration instruction of ZXCTN linear dual -o*ed

protection

)escript t-e configuration of ZXCTN linear dual -o*edprotection





T(B3# O, CONT#NT4

1 ZXCTN protection introduction.......................................................................11)1 3inear protection))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))11)1)1 161 unidirectional T.2P34 pat* protection))))))))))))))))))))))))))))))))))))))))))))))))))))))))1)% Principle of PW dual *o7ed protection))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))5

5 Configuration instruction of ZXCTN linear dual -o*ed protection.............6%)1 2P34 161 pat*8 191 protection configuration)))))))))))))))))))))))))))))))))))))))))))))))))))))"%)1)1 3inear protection application scene))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))%)% Configuration of PW dual *o7ed protection))))))))))))))))))))))))))))))))))))))))))))))))))))))):

%)%)1 (pplication scene of PW dual *o7ed protection))))))))))))))))))))))))))))))))))))))))))))))))

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,IU'#4

,igure 1.1 structure of 161Unidirectional pat* protection s;itc*ing))))))))))))))))))))))))))))))))))))))))%

,igure 1.% 161 Unidirectional pat* protection s;itc*ing <;or= connection failed>)))))))))))))))))))0

,igure 1.0 structure of 191Bidirectional pat* protection <unidirectional e?pression>))))))))))))))))&

,igure 1.& t*e 191 -idirectional pat* protection s;itc*ing <failure on ;or=ing connects @Z.(A>5

,igure 1.5 dual *o7ed protection application))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) /

,igure %.1 application scene of linear protection)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

,igure %.% typical configuration for dual *o7ed protection))))))))))))))))))))))))))))))))))))))))))))))))))))1!

T(B3#4

Ta-le %.1 seuence and essential of linear protection configuration)))))))))))))))))))))))))))))))))))))))

Ta-le %.% seuence and essential of dual *o7ed protection configuration)))))))))))))))))))))))))))1!





1 ZXCTN protection introduction

T*e ZXCTN euip7ents protection di+ides into se+eral types includes9 Net;or= le+el

protection8 port le+el protection8 -oard le+el protection)

T*e net;or= le+el protection includes9 T*e linear protection8 t*e su-net protection8 t*e

ring net protection8 t*e PW dual *o7ed protection)

T*e port le+el protection 7ainly realiDes t*roug* 3(8 di+ides into acti+eEstand-y 3(

and load s*aring 3( appro?i7ately)

T*e -oard le+el protection includes9 Po;er source8 7aster control 161 protections8 and

#1 -oard TP4 protection

T*is article 7ainly e7p*asiDes on -asic principle and t*e configuration of linear

protection and PW dual *o7ed protection on t*e net;or= le+el protection) t*is is also t*e

t;o =ind of tec*nologies are ;idely used at present) T*e su-net and t*e ring net

protection also ;ait for t*e furt*er consu77ation)

1.1 Linear protection

No; large.scale co77ercial applied ZXCTN t*e euip7ents -y C*ina 2o-ile are all

-ased on t*e T.2P34 standard8 t*e structure of T.2P34 linearity protection can -edefined -y t*e )101 and t*e 4NCE4 protection8 ot*er types are still ;aiting for furt*er

study)

T*e T.2P34 pat* protection is used for protecting a T.2P34 connection8 it is a special.

purpose end.to.end protection structure8 can -e used in t*e different net;or=

arc*itecture8 for e?a7ple9 7es* net;or=8 ring net;or=8 etc) T*e T.2P34 pat* protection

is specifically di+ided into 161 and 191) 4ince only t*e selector in recei+er acts s;itc*ing

in 161 protections8 calls t*e 161 unidirectional T.2P34 pat* protectionF But t*e selectors

on -ot* side act s;itc*ing in 191 so calls it 191 -idirectional T.2Pl4 pat* protection)

1.1.1 171 unidirectional T4$PL+ pat- protection

In 161 structures8 t*e protecti+e connection is only used for t*e paired ;or=ing

connection) T*e ;or=ing and t*e protecti+e connection carry on t*e -ridge Goint in t*e

protection territorys source) T*e ser+ice is send to t*e protection territoryHs sin= o+er t*e

;or=ing and protecti+e connection si7ultaneously) (t t*e sin=8 deter7ines t*e certain

regulation t*at is stated in ad+ance to c*oose recei+ing fro7 ;*ic* of ;or=ing or

protecti+e connection) In order to a+oid t*e si7ple point e?piring8 t*e routes of t*e

;or=ing connection and t*e protecti+e connection s*ould -e separated)

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161 T.2P34 pat* protection is unidirectional s;itc*ing8 only t*e affected direction of

connection is s;itc*ed to t*e protection pat*8 t*e selectors on t*e -ot* sides are

independent) T*e operation type of 161 T.2P34 pat* protection is returns or none

returns) T*e structure of t*e161 T.2P34 pat* protection is s*o;n in ,igure 1 .1) Under

t*e unidirectional protection s;itc*ing operation sc*e7a8 t*e protection s;itc*ing is

co7pleted -y t*e selector on t*e protection territoryHs sin= ;*ic* is totally depend on t*e

local infor7ation <protecti+e sin=>) Wor=ing ser+ice is -ridging to t*e ;or=ing and

protecti+e connection per7anently in protection territory) If uses t*e connecti+e

inspection pac=age to e?a7 t*e ;or= and t*e protecti+e connection8 t*en t*ey inserts

infor7ation to t*e ;or= and t*e protecti+e connection in t*e protection territorys source

at t*e sa7e ti7e8 and t*e e?traction and e?a7ination is carried out at protection

territoryHs sin=) 2ust pay attention8 regardless of ;*et*er connects to -e c*osen -y t*e

selector8 t*e connecti+e inspection pac=age still trans7its o+er t*e7)

,igure 1.1 structure of 161Unidirectional pat* protection s;itc*ing

To t*e failure direction <fro7 node @(A to t*e node @ZA>8 as s*o;n in ,igure 1 .%8 t*is

failure ;ill -e e?a7ined at t*e protection territoryHs sin= node @ZA8 t*en t*e selector at

node @ZA ;ill s;itc* to t*e protecti+e connection)

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,igure 1.% 161 Unidirectional pat* protection s;itc*ing <;or= connection failed>

191

-idirectional T.2P34 pat* protection9

In 191 structure8 t*e protecti+e connection is used only for eac* 7atc*ing ;or=ing

connection8 t*e ;or=ing ser+ice ;*ic* is protected -y t*e ;or= or t*e protecti+e

connection carries on t*e trans7ission) T*e ;or=ing and protecti+e connection is c*osen

-y so7e =ind of 7ec*anis7) In order to a+oid t*e si7ple point e?piring8 t*e route of

;or=ing connection and t*e protecti+e connection are separated)

T*e 191 T.2P34 pat* protection is -idirectional s;itc*ing8 -ot* directions s;itc* to t*e

protecti+e connection include t*e one is not affected) Bidirectional s;itc*ing needs

auto7atic protection s;itc*ing protocol <(P4> to t coordinated connects on t*e -ot*

sides) Operation type of 191 -idirectional T.2P34 pat* protection s*ould -e returna-le)

T*e structure of 191 T.2P34 pat* protection is s*o;n in ,igure 1 .0 ) In t*e

-idirectional protection s;itc*ing 7ode8 t*e selectors on -ot* sin= and source of t*e

protection territory operate t*e s;itc*ing toget*er8 -ase on t*e (P4 infor7ation fro7

-ot* localEcloser side and far sideEot*er end

If uses t*e connecti+e inspection pac=age to e?a7 t*e ;or=ing and t*e protecti+e

connection8 t*en t*ey inserts infor7ation to t*e ;or=ing and t*e protecti+e connection in

t*e protection territorys source at t*e sa7e ti7e8 t*e e?traction and t*e e?a7ination

carry out at t*e sin= of protection territory) Needs to pay attention8 regardless of ;*et*er

connects is c*osen -y selectors8 t*e connecti+e inspection pac=age still trans7its o+er

it)





,igure 1.0 structure of 191Bidirectional pat* protection <unidirectional e?pression>

4er+ice fails at t*e ;or=ing connection fro7 Z to (8 as s*o;n in ,igure 1 .&8 t*en

t*is failure ;ill -e e?a7ined at node () T*en uses 1 condition (P4 protection as t*e

trigger for protection s;itc*ing8 t*e protocol process flo; is s*o;n as follo;s9

1) Node ( e?a7ines t*e failureF

%) T*e node @(A selector -ridging to t*e protecti+e connection @(.ZA <i)e)8 in @(.ZA

direction8 ser+ice is trans7itted on -ot* ;or=ing connection @(.ZA and protecti+e

connection @(.ZA at t*e sa7e ti7e> and node @(A 7erges t*e selector to s;itc* toprotecti+e connection @(.ZAF

0) Trans7its t*e (P4 order to reuest protection s;itc*ing fro7 node @(A to node @ZAF

&) (fter node @ZA confir7ed t*e priority of protection s;itc*ing reuest8 node Z 7erges

t*e selector to s;itc* to protecti+e connection @(.ZA <i)e8 in t*e @Z.(A direction8

ser+ice trans7itted in ;or= connects @Z.(A and on protecti+e connection @Z.(A at

t*e sa7e ti7e>F

5) T*en t*e (P4 order is trans7itted fro7 t*e node @ZA to node @(A to infor7ing

related s;itc*ing infor7ationF

/) ,inally8 t*e ser+ice carries on t*e trans7ission in t*e protecti+e connection)

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,igure 1.& t*e 191 -idirectional pat* protection s;itc*ing <failure on ;or=ing connects@Z.(A>

1.5 Principle of PW dual -o*ed protection

T*e T.2P34 pat* protection is -ased on t*e T2P tunnel8 -ut PW dual *o7ed protection

is -ased on t*e PW le+el8 t*ey -elong to t*e different le+el) T*e PW dual *o7ed

protection is on t*e euip7ent le+el8 dual *o7ed scene is a ser+ice goes t*roug* t*e

Gunction point -ac= to t;o different euip7ents8 ;*en one euip7ent encounters po;er

failure or syste7 cras*8 t*e spare euip7ent can also guarantee nor7al operation of t*e

ser+ice) PW dual *o7ed protection actualiDes in t*e access layer8 t*e con+ergence layer

7ay not support) etailed net;or= situation reference ,igure 1 .5)

(ll ZXCTN/1!!E/%!!E/0!! euip7ents support PW dual *o7ed protection at present8

four protections types are supported separately)

1) PW 191 protection8 only *as t*e data flo; in t*e ;or=ing pat*8 sa+es t*e -and

;idt*)

%) T*e PW dou-le sends and dou-le recei+es8 -ot* ;or=ing and protection pat* *as

t*e data flo;8 t*e ad+antage is ;*en t*e euip7ent encounters failure t*ere is no

s;itc* ti7e8 if recei+e t;o copy of sa7e data fro7 t*e ;or=ing and t*e protection

;ill cause t*e ser+ice to -e unusual) T*erefore it can not interconnect to ot*er 161protection type euip7ent)

0) T*e PW dou-le sends and single recei+e8 identical to a-o+e8 -ut t*is ti7e t*e

access layer euip7ents only recei+e data fro7 ;or=ing pat*)

&) T*e PW single send and dou-le recei+es8 t*e application scene are fe;8 ;e can

use it ;*en t*e euip7ents t*at dual *o7ed interconnects to ZXCTN euip7ent8

applies loads s*aring 7ode)





5) ual *o7ed protection 7ode closely relates to t*e 7ode t*at used -y 'NC8

generally ;e use PW 1918 dou-le sends and recei+es8 t*e dou-le sends and single

recei+e to interconnect to t*e ports of 'NCHs acti+e and stand-yF T*e use single

send dou-le recei+es to interconnect to t*e 3( of 'NCHs acti+e and stand-y

<load s*aring>)

T2P34 dual *o7ed protection in fact is t*e co7-ination of PW protection and t*e

TUNN#3 protection) 4ee t*e figure -elo;)

,igure 1.5 dual *o7ed protection application

4pecification of dual *o7ed protection9

PW1 and PW% 7utually *as t*e sa7e source and different sin=s)

TUNN#31 and TUNN#3% 7utually protect t*e tunnels *a+e sa7e sin= and source)

Note:

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PW1 binds TUNNEL1, PW2 to binds TUNNEL3.

1) W*en lig*tning 1 connection encounters failure8 PW protection operates)

Note:

When lightning 2 and lightning 4 encounters failure, this time the PTN netor! has PW

sitching, since "N# has not e$amined the arning, the %rotection does not o%erate. &t leads

to the result of ser'ice disconnection.

%) W*en lig*tning % connection encounters failure8 TUNN#3 protection operates8 PW

does not operate)

0) W*en lig*tning 1 and lig*tning 0 connection encounter failure at t*e sa7e ti7e8 t*e'NC s;itc*es to t*e spare port8 t*e ZXCTN PW s;itc*es to t*e spare

Jcon+ergence euip7ent t;o 8 t*e tunnel s;itc*es at t*e sa7e ti7e) T*is ti7e t*e

ser+ice passes t*roug* PW%8 TUNN#3& nor7ally)

5 Configuration instruction of ZXCTNlinear dual -o*ed protection

T*is c*apter 7ainly introduces t*e configuration process for linear and dual *o7ed

protection -y illustrate grap* fro7 N24 UI) In addition s*o;s eac* =ind of protection

scene in detail)

5.1 $PL+ 171 pat- 1/1 protection configuration

T*e T.2P34 pat* 161 and 191 protections application scenes and configurations are

+ery si7ilar8 t*e -iggest different -et;een t*e7 is 161 protection s;itc*ing occurs in

single N# and only t*e recei+ing side operates) But 191 needs t*e (P4 protocol

controller to trigger s;itc*es on -ot* sending and recei+ing side of t*e t;o end of t*e

ser+ice)

In addition8 161 ;ill ta=e t*e 7ore net;or= -and ;idt*s t*an1918 -ecause 191 ;ill not

*a+e t*e data flo; in t*e spare pat*8 -ut 161 protections trans7it data o+er t*e ;or=ing

and t*e protection pat* at t*e sa7e ti7e)

W*en carries on t*e configuration at t*e present net;or=8 ;e needs enoug*

co77unication ;it* t*e custo7er8 and c*oose appropriate protection type8 according to

t*e -and;idt* of present net;or=)

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5.1.1 Linear protection application scene

T*e ,igure % ./ is a co77on application scene of linear protection8 TUNN#3% protects

t*e TUNN#31) W*en t*e TUNN#31 pat* encounters failure8 t*e ser+ice s;itc*es to

TUNN#3%) (t t*is ti7e t*e PW1 and t*e ser+ice is not disconnected)

T*e disad+antage of linear protection is t*e ser+ice ;ill -e disconnected ;*en lig*tning

1 encounters failureF t*en t*e PW dual *o7ed protection 7ay sol+e t*e pro-le7)

,igure %./ application scene of linear protection

Ta-le %.1 seuence and essential of linear protection configuration

Configurationse8uence

configuration content

1 Configure TUNN#318 TUNN#3% end.to.end

% configure PW1 #nd.to.end

0 Configure Jser+ice access point to t*e ser+ice onJcon+ergence euip7ent one #nd.to.end

& Create TUNN#318 and TUNN#3% protection group <it ;ill

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create T2P and O(2 auto7atically>

5.5 Configuration of PW dual -o*ed protection

5.5.1 pplication scene of PW dual -o*ed protection

PW dual *o7ed protection is t*e protection 7ode ;*ic* t*e ser+ice *as sa7e source

and different sin=8 t*e ser+ice goes t*roug* t*e Gunction point t*en 7ay finally end at

different ZXCTN euip7ent on -ot* sides) T*e follo;ing c*art t;o ports of 'NC

euip7ents on ;ireless sides connects to t*e different ZXCTN euip7ent separately

<con+ergence euip7ent one8 t;o>8 ;*en ZXCTN euip7ent or optical fi-er -et;een

'NC and a con+ergence euip7ent encounters failure8 t*is ti7e con+ergence

euip7ent t;o can guarantee t*e nor7al ser+ice)

PW dual *o7ed protection needs to nest tunnels protection to realiDe a co7pleted

ser+ice protection8 PW dual *o7ed is t;o PW set up one protection group8 7oreo+er ;e

need to create pat* protection for tunnels t*at load PW)

T*e protection relations are9

PW% protects PW1F

TUNN#3% protects TUNN#31F

TUNN#3& protects TUNN#3３F

Co7-ination relations9

No; 7any applies are tunnels 191 protection nesting PW 191 protectionF W*en PW

c*ooses 191 protection8 t*e 'NC needs to use t*e port of acti+eEstand-y protected 7ode

correspondingly)

T*e PW protection *as 7any 7odes9 t*e 1918 dou-le senders dou-le recei+es8 dou-le

senders and single recei+ers8 t*e single sender and dou-le recei+ers8 ;*en 'NC selects

3( load s*aring guard 7ode ;e need to c*oose single senders and single recei+ersF

T*e dou-le senders and dou-le recei+ers 7ust used ;it* 'NC acti+eEstand-y 7ode as

a pair<not reco77endation>)

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,igure %." typical configuration for dual *o7ed protection

Ta-le %.% seuence and essential of dual *o7ed protection configuration

configuration se8uence configuration content

1 Create TUNN#318TUNN#3% to con+ergence euip7entsend.to.end

% create TUNN#30、TUNN#3& to con+ergence euip7entt;o end to end

0 Create PW1 to con+ergence euip7ent one end to end

& Create PW1 to con+ergence euip7ent t;o end to end

5 Create tunnel protection group8 TUNN#31 is t*e ;or=ing8TUNN#3% is t*e protection <create O(2 auto7atically8can also -e done 7anually >

/ Create tunnel protection group8 TUNN#30 as ;or=ing8TUNN#3& as protection <create O(2 auto7atically8 canalso -e done 7anually>

" T*e end.to.end -ed fra7e ser+ice access point to agat*ering euip7ent ser+ice8 -inds false line PW1

On con+ergence euip7ent create a ser+ice t*at sa7e tot*e con+ergence one8 -ind PW as PW%8 t*is ser+ice is

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configuration se8uence configuration content

protection)

: Create O(2 for PW1and PW%8 c+ period is 1!!7s

<default ;*en T2P period set to -e 0)007s8 T2C 7ust-e -igger t*an T2P as default>

1! Create PW protection group at @PTN protectionA on t*e@euip7ent 7anage7entA at ser+ice access point)<t*e;ay of c*oosing protection type is referring to t*eprinciple introduced pre+iously>

Note:

When the dual homed 1(1 %rotection in PTN netor!, )*+ needs to be configured

manuall, in hich the #- %eriod closel relate to the %rotection sitching time. ince thereis no mechanism of %riorit for tunnel %rotection and PW %rotection at %resent, the one

hich e$amined the failure o%erates sitching first. &n dual homed %rotection, e ha'e to

ma!e the tunnel %rotection sitch first, then the PW %rotection. Therefore e need to

configure the #- %eriod of )*+ for tunnel and PW differentl, in order to ma!e the

e$amination %eriod of PW )*+ longer than tunnel/s, it then ma!es the tunnel e$amining the

failure and o%erating %rotection. PW %rotection o%erates onl hen the tunnel %rotection

fails.


basic principle and configuration guide for zxctn linear and pw protection_r1[1].0

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