QoSControl and Monitoring in IPX Session on “QoSControl and Monitoring… · 2017. 1. 27. ·...

QoSControl and M

onitoring in IPX

May 26, 2011

Session on “QoSControl and Monitoring”

2nd Annual i3 Forum Conference, Washington DC

Confidential and Proprietary

2

Agenda

�S

on

us

Intr

oductio

n

�Q

oS

Pro

ble

m s

tate

ment

�S

olu

tion O

verv

iew

�i3

Foru

m A

ction I

tem

s

�C

ase S

tud

y


3

Subscriber Features

What Do W

e Do at Sonus?

IP Peering

IP Enterprise

Mobile IP

Netw

orks

Wireline& Cable

IP Netw

ork

Legacy PSTN

Access

Wireline&

Wireless

TDM Enterprise

ASX

Telephony

App Server

Trunking

Business

Residential

Core Platform

s

GSX9000

Media

Gateway

NBS9000

SBC

PSX

Call Policy and

Centralized Routing

Engine

Sonus Global Services

NetScore

NetAssure

NBS5200

SBC

SGX


4

Problem Statement

�G

uara

nte

ein

g Q

oS

is c

halle

ngin

g in I

P n

etw

ork

s.

�E

nd t

o e

nd p

ath

ma

y g

o o

ver

man

y t

yp

es o

f fa

cili

ties,

techn

olo

gie

s,

multip

le n

etw

ork

pro

vid

ers

�E

nd t

o e

nd p

erf

orm

ance is b

ased o

n t

he a

gg

regatio

n o

f in

div

idua

l

netw

ork

segm

ents

�T

he n

um

ber

of

netw

ork

segm

ents

in t

he p

ath

ma

y v

ary

re

qu

est-

by-

request

�T

he im

pairm

en

t le

vel of

an

y g

iven n

etw

ork

se

gm

ent

is h

ighly

variable

�D

ifficult t

o p

inp

oin

t th

e s

ourc

e o

f im

pairm

ents

or

the d

istr

ibution o

f

impairm

ents

betw

een t

he n

etw

ork

s a

cro

ss t

he p

ath

.


5

Solution Overview

•Detecting Service

Impairments

•Guaranteeing SLAs

Identifying

Impairment

Source

Procedure(s) to

remedy the

“Service

Impairment”

�Active M

onitoring

�Passive M

onitoring

�End-to-End RTCP

Measurements

�Measurements in

Netw

ork Border

Functions

�QoS Aware Routing


6

Active/Passive M

onitoring Pr

ocedure(s) to

remedy the

“Service

Impairment”

�Active M

onitoring

�Passive M

onitoring

�End-to-End RTCP

Measurements

�Measurements in

Netw

ork Border

Functions


Impairments

•Guaranteeing SLA

Identifying

Impairment

Source



7

How to M

easure?

�A

ctive

me

asu

rem

en

ts�

Cre

ate

syn

the

tic t

est

tra

ffic

.�

Em

be

dd

ed

or

sta

nd

alo

ne

pro

be

s.

�U

se

fuln

ess d

ep

en

ds o

n h

ow

clo

se

th

e s

yn

the

tic t

raff

ic is t

o

rea

l tr

aff

ic.

�P

assiv

e m

ea

su

rem

en

ts�

Me

asu

re a

ctu

al p

rod

uctio

n t

raff

ic.

�C

an

be

le

ss c

on

tro

ve

rsia

l (i

ntr

usio

n,

pri

va

cy c

on

ce

rns).

Probe

Probe

(1) Generate test traffic

(2) Reflect test traffic

Sniff + evaluate

(could be embedded)

Production traffic

Production traffic

Production traffic

Test metadata

Production traffic

Sniff off-

Evaluate

Encapsulate


8

End-to-End RTCP Measurements

Procedure(s) to

remedy the

“Service

Impairment”

�Active M

onitoring

�Passive M

onitoring

�End-to-End RTCP

Measurements

�Measurements in

Netw

ork Border

Functions


Impairments


Identifying

Impairment

Source



9

End to End RTCP

�W

here

is t

he a

ctu

al pro

ble

m?

Carrier A

IPX netw

ork

Carrier B

IPX netw

ork

CHF

CHF

Border

Functions

Border

Functions

Border

Functions

Border

Functions

Mobile

Provider A

Mobile

Provider(s)

Border

Functions

Gateway

Functions

Gateway

Functions

Border

Functions

RTP/RTCP

generation/term

ination

Packet loss detected based

on RTP sequence numbers

but where it occur?

Packets

dropped here


10

�T

erm

ina

tin

g R

TC

P w

ill m

ask k

no

wle

dg

e a

bo

ut

pa

cke

t lo

ss.

End-to-End RTCP Measurements

Mobile

Provider(s)

Carrier A

IPX netw

ork

Carrier B

IPX netw

ork

CHF

CHF

Border

Functions

Border

Functions

Border

Functions

Border

Functions

Mobile

Provider A

Border

Functions

Gateway

Functions

Gateway

Functions

Border

Functions

RTP/RTCP

generation/term

ination

RTP/RTCP

generation/term

ination

Packets

dropped here

•Measurements do not indicate a problem because Carrier A Border

Functions rewrite RTP sequence numbers shielding packet loss from

Mobile Provider A


11

Measurements in Netw

ork Border Functions

Procedure(s) to

remedy the

“Service

Impairment”

�Active M

onitoring

�Passive M

onitoring

�End-to-End RTCP

Measurements

�Measurements in

Netw

ork Border

Functions


Impairments


Identifying

Impairment

Source



12

Measurements in Netw

ork Border Functions

�U

sin

g M

ea

sure

me

nts

in B

ord

er

Fu

nctions t

o id

entify

th

e p

roble

m

locatio

n

Carrier A

IPX netw

ork

Carrier B

IPX netw

ork

CHF

CHF

Border

Functions

Border

Functions

Border

Functions

Border

Functions

Mobile

Provider A

Mobile

Provider(s)

Border

Functions

Gateway

Functions

Gateway

Functions

Border

Functions

RTP/RTCP

generation/term

ination

RTP sequence numbers used

to calculate the total number

of lost packets. Individual

reports from Border Functions

provide “per hop”loss count

Measurement reports from

Border Functions


13

�W

ork

s e

ve

n if

RT

CP

is b

roke

n

�U

se

SIP

Sig

na

ling

fo

r re

po

rtin

g b

y e

ach

Bo

rde

r F

un

ctio

n

Ele

me

nt.

�S

en

t in

th

e c

on

text

of

the

ca

ll d

ialo

g

�C

an

be

se

nt

with

PU

BL

ISH

or

OP

TIO

NS

�M

essa

ge

vo

lum

e w

ill b

e a

n issu

e –

a m

ech

an

ism

ne

ed

s t

o

be

id

en

tifie

d t

o r

estr

ict

the

re

po

rtin

g t

o a

co

nfig

ura

ble

fra

ctio

n o

f th

e t

ota

l ca

lls.

Reporting Border Functions Measurements via SIP


14

QoS Aware Routing

Procedure(s) to

remedy the

“Service

Impairment”

�Active M

onitoring

�Passive M

onitoring

�End-to-End RTCP

Measurements

�Measurements in

Netw

ork Border

Functions


Impairments


Identifying

Impairment

Source



15

�D

ecid

e h

ow

in

term

ed

iary

me

asu

rem

en

ts a

re t

o b

e r

ep

ort

ed

�R

TC

P p

iggybackin

g v

.s. S

IP m

eth

od b

ased r

eport

ing

�F

or

SIP

meth

od r

eport

ing, decid

e for

PU

BLIS

H v

.s. O

PT

ION

S

�F

or

SIP

meth

od r

eport

ing, use R

FC

6035 S

IP E

vent P

ackage

for

Voic

e Q

ualit

y R

eport

ing

�D

ecid

e w

he

the

r a

“g

en

era

te r

ep

ort

s”

ind

ica

tor

is n

ee

de

d t

o

co

ntr

ol tr

aff

ic v

olu

me

�D

ecid

e w

he

the

r to

po

log

y h

idin

g is a

n issu

e f

or

rep

ort

s

ge

ne

rate

d b

y B

ord

er

Fu

nctio

ns

i3Forum Action Items


16

Sonus Case Study

NetAssure

NetScore

NBS5200

NBS5200

PSX

Procedure(s) to

remedy the

“Service

Impairment”


Impairments


Identifying

Impairment

Source


17

�E

xp

eri

en

ce

in

de

sig

nin

g,

de

plo

yin

g a

nd

tro

ub

lesh

oo

tin

g t

he

larg

est

Vo

IP n

etw

ork

s in

th

e w

orl

d.

�B

uilt

op

era

tio

na

l to

ols

to

su

pp

ort

th

ese

ne

two

rks

�T

oo

ls p

rod

uctize

d a

nd

ma

de

ava

ilab

le t

o t

he

en

tire

So

nu

s

cu

sto

me

r b

ase

Sonus Case Study


18

Active M

onitoring: Sonus NetAssure

NetS

core

N

etS

core

N

etS

core

N

etS

core

C

entr

aliz

ed

Centr

aliz

ed

Centr

aliz

ed

Centr

aliz

ed

Repo

rtR

epo

rtR

epo

rtR

epo

rtServ

er

Serv

er

Serv

er

Serv

er

NetA

ssure

NetA

ssure

NetA

ssure

NetA

ssure

Anal

yzer

Anal

yzer

Anal

yzer

Anal

yzer

NetAssure

Agent

PoP

/NoC

IP N

etw

ork

Netw

ork M

anagement

Netw

ork

Operations

PoP

/NoC

NetAssure

Agent

SLA Monitoring

and alerting

Visualization

Customized

reports

Sig

nalin

g

Media

Call

Qualit

y R

ecord

s (C

QR

s)C

all

Qualit

y R

eco

rds

(CQ

Rs)

GSX9000

PSX

Centralized

Routing

Engine

ASX NBS9000

SBC

EMS

GSX9000

ASX

NBS9000

SBC

PSX

Centralized

Routing

Engine


19

�N

ee

d t

o m

on

ito

r a

t d

iffe

ren

t la

ye

rs

�N

etw

ork

layer

–IP

Sw

itches, R

oute

rs

�S

erv

ice layers

–M

edia

Gate

ways, S

BC

s, P

olic

y E

ngin

es

�M

imic

th

e p

rod

uctio

n t

raff

ic a

s m

uch

as p

ossib

le

�S

ynth

etic c

entr

aliz

ed r

outing e

ngin

e tra

nsactions, flexib

le

genera

tion o

f S

IP m

essages a

nd C

all

Flo

ws, IP

packe

ts

treatm

ents

in n

etw

ork

ele

ments

�In

la

rge

ne

two

rks,

de

plo

yin

g a

ha

rdw

are

-ba

se

d m

on

ito

rin

g

so

lutio

n m

ay b

e p

roh

ibitiv

e -

> b

uilt

a

so

ftw

are

ba

se

d

so

lutio

n.

Lessons Learned from Active M

onitoring (1)


20

�A

ctive

mo

nito

rin

g s

uff

ers

fro

m t

he

N^2

pro

ble

m:

Ne

ed

to

sim

plif

y p

rovis

ion

ing

an

d d

ep

loym

en

t o

f p

rob

ing

ag

en

ts

�N

ee

d t

o h

ave

an

in

telli

ge

nt

me

ch

an

ism

to

de

tect

se

rvic

e

dis

rup

tio

ns,

an

d t

o iso

late

fa

ults

�D

yna

mic

Thre

sh

old

ing –

learn

ing a

bout th

e n

etw

ork

�In

telli

gent S

yste

ms to

corr

ela

te e

vents

genera

ted

by v

arious p

robes

Lessons Learned from Active M

onitoring


21

Passive Monitoring: Sonus NetScore

Netw

ork

Elements

User Interfaces

&

Reporting Tools

Alarm

s

Perform

ance Reports

Drill Down

CDRs

NetScore

Analytics

Engine

Correlation and Analysis


22

�S

on

us’s

pa

ssiv

e m

on

ito

rin

g r

elie

s o

n m

inin

g t

he

CD

Rs v

/s

full

me

dia

ca

ptu

re a

nd

an

aly

sis

–th

e la

tte

r a

pp

roa

ch

ma

y

be

de

em

ed

im

pra

ctica

l /c

ost

ine

ffe

ctive

in

la

rge

ne

two

rks

�Q

oS

me

tric

s

�P

acket lo

ss (

1stand 2

nd

ord

er

sta

tistics),

jitte

r, R

ound T

rip

Tim

e (

when R

TC

P a

vaila

ble

or

via

pro

bin

g)

�M

edia

im

pairm

ents

are

typic

ally

indic

ative o

f a tem

pora

ry

pro

ble

m r

ath

er

than a

chro

nic

one.

�S

erv

ice

Pa

ram

ete

rs m

etr

ics

�A

nsw

er

Seiz

ure

Ratio (

AS

R)

and A

vera

ge L

ength

of

Convers

ation (

ALO

C)

are

typic

ally

indic

ative o

f serv

ice

metr

ics.

�S

om

e c

arr

iers

focus s

ole

ly o

n the m

etr

ic A

LO

C a

s a

n e

arly

indic

ato

r of serv

ice im

pairm

ents

of any type.

Lessons Learned from Passive M

onitoring (1)


23

�Im

po

rta

nt

to d

efin

e t

he

Entities

(or

co

mb

ina

tio

n t

he

reo

f) f

or

wh

ich

th

e s

erv

ice

me

tric

s a

re c

alc

ula

ted

�In

div

idu

al Entities

(wh

en

id

en

tifia

ble

)

�A

dja

cent B

GF

�P

eering IP

X

�S

erv

ice P

rovid

er

�D

estination –

(Countr

y C

ode, N

ational D

estination C

ode, etc

..)

�A

co

mb

ina

tio

n o

f Entities

�P

eering IP

X A

ND

Destination

�A

dja

cent B

GF

AN

D D

estination

Lessons Learned from Passive M

onitoring (2)


24

VoIP

VoIP

Service

Provider A

Service

Provider B

Carrier A

IP netw

ork

Carrier B

IP netw

ork

CHF

Border

Functions

Border

Functions

TDM

CHF

Border

Functions

Media

Gateway

Border

Functions C

CHF

Border

Functions

Media

Gateway

Border

Function A

Carrier C

IP netw

ork

Destination 1

Destination 2

CDR M

ining

Route 1, Destination 1

Route 2, Destination 2

Entity 1: Border C, Destination 1

Entity 2: Border A, Destination 1

Border

Functions C


25

�M

ea

su

rem

en

ts c

an

be

use

d f

or

Qo

S A

wa

re R

ou

tin

g

�M

ore

po

we

rfu

l if n

etw

ork

wid

e Q

oS

vie

w is u

tiliz

ed

QoS Aware Routing

QoS m

etrics

Route priorities

per destination

Routing

request/responses

Border Functions

Element -1

Border Functions

Element -2

Border Functions

Element -3

QoS Measurement

Aggregator

Centralized Routing

Engine


26

Thank You

QoSControl and Monitoring in IPX Session on “QoSControl and Monitoring… · 2017. 1. 27. ·...

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