9 owg500210 dual-homing principle and configuration(vmsc) issue1.0

7/24/2019 9 OWG500210 Dual-homing Principle and Configuration(VMSC) ISSUE1.0

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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

ual!homing"rinciple and

Con#guration$%&'C(


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Pa e2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

)e*erences

&'+T-000 ual!Homing /ser &anual


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+1ectives

/pon completion this course, you will eale to

/nderstand the asic concept o* dual!homing solution

"er*orm the data con#guration o* dual!homing %&'C

solution


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Contents

1. Dual-homing Concept

2. ual!homing "rinciple

. ata Con#guration

3. +peration and &aintenance


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)3 'o*t!'witch 'olution

Management system Service system Billing system SS7 network

MSC has been

separated into

MSC Server and

MGW

VoIP

MSC Server

MGW1 MGW n

IP backbone network


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)edundancy and 'ecurity

?MSC Server works as control plane, It

is very important to garantee the

redndancy and secrity on MSC

Server side!

MSC Server

MGW1 MGW n

IP bearer

?1.8 million subscribers


7/63Pa e7Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

The e#nition o* ual!homing

H is a networ4ing mode. 5n the "" )3 networ4ing and later, one

&7 is homed to two &'C 'ervers. 8ormally, an &7 registers with

the active &'C 'erver. 7hen the active &'C 'erver ecomes *aulty,the &7 registers with the standy &'C 'erver so that the

suscriers can still en1oy services.

ctive MSC Server ssistant MSC Server

MGWstan!byctive



The e#nition o* ual!homing

The active &'C 'erver

The standy &'C 'erver we can also call it disaster recovery server, it is

used to ac4up the data and service *or the active server9 The virtual &'C 'erver the disaster recovery &'C 'erver is logically

partitioned into 8:; virtual &'C 'ervers. The virtual &'C 'ervers are

identi#ed according to 'erver inde



Advantage o* ual!homing

5n H solution, one &7 is homed to two &'C 'ervers. 7hen the active &'C 'erver ecomes *aulty, the &7

registers with the standy &'C 'erver so that the suscriers can still en1oy services. 'o that we can say, it

improves the networ4=s reliaility.

7hen an active &'C 'erver is going to e moved or upgraded, you can manually trans*er its services to the

standy &'C 'erver. 5t improves the service=s continuity.

There is no special re>uirement *or other networ4 nodes and terminals.

"SS# "SS$ "SS% "SS&

'raditional networking mode

"SS# "SS$ "SS% "SS&

'he () networking mode



i?erent H 'chemes

1+1 Active and Standby Mode

1+1 Assistant Mode

N+1 Assistant Mode

N+1 Active and Standby Mode



ctive MSC Server1 Stan!by MSC Server#

MGW1 MGW# MGW" MGW&

H ;:; Active and 'tandy8etwor4ing &ode

;:;Active and 'tandy &ode 5n two &'C 'erver, one

o* them is active, the other is in the standy state.



ctive MSC Server1 ctive MSC Server#

MGW1 MGW# MGW" MGW&

H ;:; Assistant &ode

;:; Assistant &ode 5n this mode, there are no di?erence o*

active server and standy server. @oth o* &'+T-000s are

active &'C 'ervers, and also assistant &'C 'ervers o* each other.



Active MSC Server1 Standby MSC Server3

MGW3

Active MSC Server2

MGW2MGW1 MGW4

H 8:; Active and 'tandy&ode

8:; Active and 'tandy &ode 8 &'+T-000s wor4 as

active &'C 'ervers, the other one as the standy &'C 'erver.

+nly 8 server are active, the other ; server is always e

standy.



8 8:; Assistant 8etwor4ing&ode

N+1 Assistant Mode 8 &'+T-000s wor4 asactive &'C 'ervers, the other one as the standy

&'C 'erver.

All the 8:; 'erver are active.

Active MSC Server1 Standby MSC Server3

MGW3

Active MSC Server2

MGW2MGW1 MGW4MGW5



'ummary

ual!homing asic concept

The advantage o* ual!homing

The application o* the dual! homing networ4ing



Contents

;. ual!homing Concept

2. Dual-homing Principle

. ata Con#guration




ctive 'eactive

(ecovere!) switc*

$irtual MSC

Server%

$irtual MSC

Server1

bnormality) switc*

'eactive ctive

$irtual MSC Server1$irtual MSC

Server%

The &'C 'erver supports the *ollowing *our H switchmodesAuto switch9 &anual switch9 Auto ac4ward9 &anualac4ward.

The 'witch &ode o* ual!homing



$irtual MSC Server%

Triggering Condition o* &anual 'witch &anually setting the H

status.Triggering Condition o* Auto 'witch Hearteat detection and

&7

registering re>uest.

@oth o* these two modes are in applied in the current networ4.

$MSC Server1 $irtual MSC Server%

$irtual MSC Server1

MSC Server1 MSC Server#

+'P *eartbeat

Triggering Condition o* H'witch



'eactive

citve t*e!isaster recovery

server,s local

o--ice in-ormation

ctive

MGW an!

correlative

signaling

ctive BICC

MSC

Server%

$irtual MSC Server1

ctive

switc*

H %irtual &'C 'erver 'erviceTa4eover



5mpacts o* H 'witching onCaller

MS SVR1 SVR2

' 1/1 ssistant sc*eme0t*e

rocess o- making a call

*MGW

MS is S$(1,s attac* subscriber. In normalcon!ition) it will initiate call rocess to S$(1.

BW*en t*e S$( is -aulty MGW will register toS$(#) c*ange t*e signaling route) sent call re2uest to

S$(#In S$(#,s $3() t*ere are no subscriber o- t*is MS.

So) it will return -ailure) t*e reason is 4absent subscriber56

DMS initiate 3+ rocess) t*en t*e call rocess cansuccess.

MS SVR1 SVR2

' 1/1 ctive an! Stan!by sc*eme0

t*e rocess o- making a call

*MGW

MS is S$(1,s attac* subscriber. In normalcon!ition) it will initiate call rocess to S$(1.

BW*en t*e S$( is -aulty )S$(# will receive t*eMS,s calling re2uest.

In S$(#,s $3() t*ere are no subscriber o- t*isMS. So) it will return -ailure) t*e reason is 4absent

subscriber56

DMS initiate 3+ rocess) t*en t*e call rocesscan success.

In the call process, all o+ the signaling and rote reelect are

completed by the MGW, it has no relationship with "SC-.C!

In the call process, all o+ the signaling and rote reelect are

completed by the MGW, it has no relationship with "SC-.C!



5mpacts o* H 'witching onCallee

!

' 1/1 ssistant sc*eme

callee rocess

*e caller MS sen!s S(I re2uest to t*e3(6

B3( gets t*e MS( -rom t*e backuS$(1 in t*e S$(#6

In t*e $3( o- backu S$(#) t*ere are nosubscriber,s !ata. So) t*e S$(# will sen! !ata

recovery re2uest to t*e 3(6

D3( inserts subscriber,s !ata into t*ebacku $3( o- S$(#6

ES$(# will backu t*e P( (SP w*ic* isreturne! by t*e S$(1. *en t*e callee rocess

will continue.

FSP9SG *els to comlete t*is rocess.

PSTN/MSC SVR1 SVR2

*HLR

!

' /1 ctive an! Stan!by

sc*eme callee rocess

*e caller MS sen!s S(I re2uest to t*e3(6

BS$(# receives P( message -rom 3()3( nee!n,t to c*ange t*e route

arit*metic:S$(# uses t*e same signaling oint;6

In t*e $3( o- backu S$(#) t*ere are nosubscriber,s !ata. So) t*e S$(# will sen! !ata

recovery re2uest to t*e 3(6

D3( inserts subscriber,s !ata into t*eS$(#6

ES$(# return P( (SP) t*e callee rocesswill continue.

FSP9SG *els to comlete t*e re0

!irectional an! backu rocess.

PSTN/MSC SVR1 SVR2

*HLR



5mpacts o* H on Calling and@illing

5mpact on calling uring the H switching, &7 will change the registered 'erver. The

resource will e provided y this &7. All calls, eing processed y the

original active &'C 'erver, will e interrupted. The &7 reclaims all

resources9

uring the H switching or ac4ward, the &'C 'erver, which will ta4e

over services, initiate reset to the trun4 group. Then, terminals

$including callers and callees( will e released .

5mpact on @illing

uring the H switching, ills will e lost ecause they wouldn=t e

generated y the original &'C 'erver in time,.

A*ter switching, ills are generated on the i7@ o* an current activated

&'C 'erver. The illing center connect the current i7@ to get ills.


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'ummary

H switching modes and its triggering condition

H switching impact on calling and illing


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Contents

;. ual!homing Concept

2. ual!homing "rinciple

". Data Con#guration



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Contents

ata Con#guration

".1 Dedicated Data o$ D%

.2 5nternal ata Con#guration

. 5nterconnection ata Con#guration

.3 'ervice ata


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edicated ata Con#guration'teps

5* &'itch modeo* a virtual 'erver node in the localoGce is set to Automatic, con#guration steps are as

*ollowing

'tep ; /se the command 'T H7& to set 7or4 mode o*

virtual 'erver node 0 to Assistant, 'witch mode to &anual, and

orce state to Activated.

'tep 2 /se the command A ')%8+ to set the assistant

&'+T-000 o* a local one $*or e


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'et H 7or4ing &ode

&() D%*M *or mode, a parameter, is used to de#ne the wor4

mode o* a local oGce in a networ4. Iou can use the

command 'T H7& to set 7or4 mode to 'tandalone or

Assistant.

'tandalone indicates the local &'+T-000 does not wor4 in Hmode.

Assistant indicates the local &'+T-000 wor4s in the H mode.

5t is only valid when 7or4 mode is set to Assistant. 5t

de#nes the switch mode o* a certain virtual 'erver node

in the local oGce.

5t is valid when &'itch modeis set to Automatic. 5t

de#nes the ta4eover mode when a certain local virtual

'erver node is switched over automatically. The system

supports all the modes.

Handsha4e timeout $JKs(


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'etting H %irtual 'erver 8ode ADD &,ND(

5n the tale o* virtual 'erver nodes, item 0 is always con#gured *or

a local &'C 'erver, while other items are con#gured *or assistant or

standy &'C 'ervers.

@e*ore adding a virtual 'erver node in the &'C 'erver, set 7or4

mode o* the virtual 'erver node 0 to Assistant with the command

'T H7& to activate the dualhoming *unction o* the local oGce.

in!e< server

0 S=0

1 S=01

# S=0#

... ...n S=0n

in!e< server

% S=01

1 S=0

in!e< server

% S=0#

1 S=0

in!e< server

% S=0n

1 S=0

S=01

S=0#

S=0n

......S=0


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'etting Local "ort o* HHearteat Lin4 $+ptional( &() D%/CP,)N

'ignals o* H hearteat lin4 are transmitted

through the /" protocol9

@y de*ault, the /" port numer used y thehearteat lin4 o* the local &'+T-000 is ;000.


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'etting H Hearteat Lin4

ADD D%%C0 Considering sa*ety, con#gure two hearteat lin4s

i* the system has two pairs o* 75&s or more.

(ncrption method 5t speci#es whether the

hearteat signals needs encrypting or not. Thede*ault type is M&KN.

3e4 5t speci#es the 4ey re>uired y the &K

encryption algorithm. The value should e a

character string o* at most ;6 characters.


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Contents

ata Con#guration

.; edicated ata o* H

".2 5nternal Data Con#guration


.3 'ervice ata


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Local

ata The local data is used to de#ne

'ignaling point code, Country code and area code,

8ational toll area code, &ulti!area statistics inde


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Local ata ADD MA&5

Add &ulti!area statistics inde


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Contents

ata Con#guration

.; edicated ata o* H


"." 5nterconnection Data Con#guration

.3 'ervice ata


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&c 5nter*ace ata *orConnecting to &7

ADD M* The data *or connecting to the &7 is an interconnection

data o* the &'+T-000. 5t de#nes the *ollowing

in*ormation

The data o* H.23P lin4s etween the &'+T-000 and the

&7

The &edia connection relationship etween &7s

The in*ormation o* paths etween &7s

The parameter &7 inde< $A &7( is directly

associated with the inde< o* virtual 'erver nodes and

determines the virtual 'erver node to which the &7s

elong.


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ata Con#guration o* &c Lin4

ote>

;. The direction o* arrowhead means CL58T to ')%). or '-;, /&; ismaster,

and /&2 is standy.2. '-; and '-2 are ac4up. ollow the load!share principle to select the 7@'.

1 1

BSG1

2

SX1 SX2

+MG1 +MG#

BSG2 BSG3 BSG1 BSG2 BSG3

PPU1 PPU2 PPU3 PPU1 PPU2 PPU3

11 1 2 2 2 2


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'ignaling 5nter*ace ata

5* a local '" related to the &T" '" elongs to virtual

'erver node 0, the &T" '" and suse>uent data to e

con#gured are also in charge o* virtual 'erver node 0.

Con#guration procedure o* the &2/A!ased &T" are as

*ollowing

Con#gure active 8Q'", 8QLR', 8Q)T and 8QL8R *or virtual &'C

'erver node 0.

Con#gure standy 8Q'", 8QLR', 8Q)T and 8QL8R *or other virtual

&'C 'erver nodes.

ollow the load!share principle to select the 7@'.

MP Con-igurationMP Con-iguration


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The Homing 'erver o* &2/A lin4 sets and lin4s are determined

y '.

5* the ' is homed to virtual 'erver node 0, the lin4 sets and

lin4s o* &2/A are in charge o* virtual 'erver node 0. "roceed as

*ollows to implement the &2/A con#guration

Con#gure active ', &2/A lin4 sets and lin4s *or virtual 'erver node 0.

Con#gure standy ' and &2/A lin4s and lin4 sets *or other virtual 'erver

nodes.

Con#gure one &2/A lin4 set *or the &7 $emedded '(. The lin4 set

contains two lin4s, one o* which is connected to an active &'C 'erver and the

other is connected to a standy &'C 'erver.

Con#gure an &2/A lin4 on the &7 $emedded '(. Then the &2/A lin4 set

ma4es the lin4 e managed y the virtual 'erver node that manages itsel*.

M#+ Con-igurationM#+ Con-iguration


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The Homing 'erver o* &/A con#guration $&,

&LR', &)T and &L8R( are determined y local '".

5* local '" node 0 is speci#ed *or &L, the con#guration

o* its suse>uent data is in the charge o* local '" node

0.

"roceed as *ollows to implement the &/A

con#guration

Con#gure active &/A local entities, destination entities, lin4 sets,

routes and lin4s *or virtual 'erver node 0.

Con#gure standy &/A local entities, destination entities, lin4

sets, routes and lin4s *or other virtual 'erver nodes.

ollow the share!ali4e principle to select the 7@' module on the

&'+T-000 and try to ma4e all 7@'s share services o* one '.

M"+ Con-igurationM"+ Con-iguration


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ctive MSC Server 'isaster recovery MSC Server

Master

?PC>Mster ?PC>B

Slave ?PC>

MGW9SG

Master linkStan!by lonk

?PC>C

(irection o+ link

set is /01C

(irection o+ link

set is C01/

(irection o+ link set

is /01C, when the

master link is active,

the slave link is de0

active

H 'ignaling Con#guration!Lin4 "riority Level


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Master MSC Server 'isaster recovery MSC Server

Master

?PC>

Master

?PC>B

Slave ?PC>

MGW9SG

?PC>C

(irection o+

rote is /01C

'hrogh rote

direction is C01/bypass rote

direction is C01"01/

(irection o+ rote is

"01Cmaster 2PC

and the slave 2PC is

standby signaling

point relationship

H 'ignaling Con#guration!)oute "riority Level


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/in Priorit ,oute Priorit

/in a6aila7ilit5n T& networ4, hal* o*

lin4s can=t e used

High Lin4

availaility

&'itch time delaActive and de!activelin4 switch to each

other, time delay e


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'ummary Local in*ormation associate with virtual node inde< directly9

58+&'C associate with its virtual node y the corresponding

relationship with the +5.

&A'5 in*ormation manage virtual node inde< directly. 5t con#rm which

virtual node that &'C in multi!area elong to.

&7 associate with the virtual node inde< directly. The &CL8R associatewith the virtual node y the &7 it elongs to.

@'C, )8C and LA5SA5 and so on associate with the virtual node y the

local in*ormation that +"C elong to.

5'/", T/", ")A, )2 oGce direction associate its virtual node y the media

gateway that trun4 group elong to. @5CC oGce direction associate with the virtual node y the @5CC'CT"L8R.


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Contents

ata Con#guration.; edicated ata o* H



".9 &er6ice Data


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H &oility &anagement

very virtual &'C 'erver has its own moility data, such as )8C,

@'C, LA5SC5. 'o a*ter the H switch, i* the &'C 'erver=s signaling

su system can e active, then the update location in virtual &'C'erverS%L) can completed success*ully. or e


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L/!@etween %irtual 8odes in+ne &'C 'erver

#.+!ate3ocation :MSC#)$3(#;

@.InsertSub'ata

A.InsertSub'ata(es

&.Cancel3ocation(es

".Cancel3ocation

7.+!ate3ocation(es

:3(;

MSC$V3-$3/I$ )3-MSC#V3-#3/I#

1.3ocation +!ate (e2

:ol! 3I 3I1)new 3I 3I#;

8.3ocation +!ate cc

MS

%L) initiates the location update to the HL) to in*orm the HL) the

suscrier=s location. 5t can use necessary method $inside

implement(, so to avoid the conOict etween the Oow o* insert data

and delete data9 The data con#guration 1ust li4e in normal situation.

The inside implement is used to adapt the change o* H switch.


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H ata )ecovery and "aging

#.(estore 'ata

1.Provi!e(oamingbr MSC#

".(estore'ata(es

A.Paging :3I in MSC area;

&.Provi!e(oamingbr(es

MSC$V3-$3/I$ )3- "SC

@.IM

7hen the suscriers ma4e the #rst call a*ter the H

switching without location updating. To the caller service, i*it #nd there are no suscrier data, or the caller service

route to the new &'C ut #nd no suscrier, then the

recovery Oow will e triggered.


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H Handover low

5ntra!oGce handover data The handover etween locationareas in a same virtual 'erver node is the intra!oGce

handover. The data con#guration is the same as that in

common cases. The handover *rom LA5!; to LA5!2 or LA5!

are all intra!oGce handover.

5nter!oGce handover data etween di?erent virtual 'erver

node A location area whose local oGce is con#gured with a

virtual 'erver node will e con#gured as a local %L) location

area cellSservice area. The LA5!,LA5!3 are local %L)=s

service area. @ut their virtual node is di?erent. 'o, the

switch *rom LA5! to LA5!3 is intra!oGce handover.

5nter!oGce handover data etween di?erent &'C 'ervers is

same as common data.


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Virtal Server# "SC

;."repareHandover)e> &'C,C5

3. "repareHandover)es

VirtalServer$V3-$3/I$

K.5A& H+8

Lin4 to &'C 8umer y C5, andallocating the handover numersaccording to this

&'C 8umer.

2.Handover)e> $C5(

.Handover)e>Ac4

A*ter the H 'witching, the handover etween two virtual 'erver is inter!&'C

handover.

5n A LA5C5SLA5'A5 the type o* LA5 in to!e!ta4en!over virtual node

should e con#gured as local %L) LA5.

Handover "rocedure andCon#guration A*ter 'witching


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H Trun4 +Gce irection'cheme A inter*aceS5'/"ST/"S)2S")AS@5CC oGce

direction, su route, route, route analysis,

trun4 group, circuit data are con#gured same

as common data.


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H=s 8umer Analysis and)outing unctionActive MSC Server Standby MSC Server

MGW1

Active in!

%e$active in!

MGW2

"A#$5"A#$2 "A#$4

"A#$1

The caller &' elongs to &7;, the called &' elongs to the &72. A*ter

H switching, the &7; and the &72 are also intra!oGce circuit. 'o, it is

impossile to estalish mesne earing. The call can not e separated in

logic. @e*ore H, it is intra!oGce call, i* we don=t di?erentiate di?erent

virtual node=s roaming numer pre#


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H )oaming 8umer andHandover 8umer Assignment

get MSC umber -rom

+serIn-o In $'B

:1;

Msc umber MS(9? Su--i< I'

MSC an! MS(9? maing relation able

8A1"%7@@%% %

8A1"%7@@%1 1

......

:#;

I' MS(9? Pre-i

9 owg500210 dual-homing principle and configuration(vmsc) issue1.0

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