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1 Device I n s t r u m en t a t io n E x a m p l es : I P S L A s & N et F l o w Presented by Emmanuel Tychon Techni cal M ark eti ng Eng i neer TU D resden, J anuary 1 7 th

2 C is co I O S I P S L A s 2

3 M Today s M u l t i m e di a Q os R e q u i r e m e n t s ( E x am p l e s ) T r a f f i c T y p e M a x i m u m P a c k e t L o s s M a x i m u m O n e -W a y L a t e n c y a x. J i t t e r V o I P (l and l ine q ual ity ) 1 % m s 3 0 m s V i d e o - c o n f e r e n c i n g 1 % m s 5 0 m s S t r e a m i n g v i d e o ( o n e w a y v i d e o ) 2 % 5 s N/A (assuming the receive buffer is l arge eno ugh) How to measure? 3

4 A r c h i t e c t u r e O v e r v i e w IP SLAs is a f e at u r e t o t e st t h e n e t w o r k m e t r ic s an d t o v al id at e SLAs. IPSLA R e s p o n d e r IPSLA-T e s t R o u t e r IPSLA Se n d e r IP H o s t M a n a g e m e n t ( o p t i o n a l ) T a r g e t s 4

5 K I P S L A O p e r at i on w i t h R e s p on de r [ 1 / 2 ] IPSLA Sender C o nt ro l M es s a g e As k R ec ei v er t o O p en Po rt o n U D P) IPSLA R es p o nder C o nt ro l Ph a s e Pro b i ng Ph a s e IPSLA-C o n t r o l IPSLA-T e s t R es p o nder Sa y s O Sendi ng T es t Pa c k et s D o ne: St o p Li s t eni ng U D P, St a rt Li s t eni ng o n U D P Po rt U D P,

6 U D P J i t t e r O p e r at i on Measures t h e d el ay, d el ay v ari an c e ( j i t t er) an d p ac k et l o ss b y g en erat i n g p eri o d i c U D P t raf f i c. Measures: p er-d i rec t i o n j i t t er, p er-d i rec t i o n p ac k et -l o ss an d ro un d t ri p t i m e. D et ec t an d rep o rt o ut -o f -seq uen c e an d c o rrup t ed p ac k et s. O n e-w ay d el ay req ui res C i sc o I O S ( 2 ) T o r l at er an d c l o c k sy n c h ro n i z at i o n b et w een so urc e an d d est i n at i o n. A l w ay s req ui res I P S L A resp o n d er. S t art i n g C i sc o I O S ( 4 ) T, t h e o p erat i o n c an m easure MO S an d I C P I F sc o res f o r V o I P. 6

7 p e P2 U D P J i t t e r - M e as u r e m e n t E x am p l e Send Pa c k et s i 1 P1 S Tx = s e n t t s t a m f o r p a c k e t x. P2 R ec ei v e p a c k et s i 2 P1 ST2 ST1 IPSLA R ef l ec t ed p a c k et s P1 i 4 P2 IP C o r e R T2 R T1 R es p o nder R ep l y t o p a c k et s P1 i 3 P2 RTx = r e c e i v e t s t a m p f o r p a c k e t x. dx = p r o c e s s i n g t i m s p e n t b e t w e e n p a c k e t a r r i v a l a n d t r e a t m e n t. A T1 A T2 R T1 + d 1 R T2+ d 2 A Tx = r e c e i v e t s t a m p f o r p a c k e t x. E a c h p a c k et c o nt a i ns ST x, R T x, AT x, dx a nd t h e s o u rc e c a n no w c a l c u l a t e: J i t t ersd = ( R T 2 -R T 1 ) -( ST 2 -ST 1 ) = i 2 -i 1 J i t t erd S = ( AT 2 -AT 1 ) -( ( R T 2 + d2 ) -( R T 1 + d1 ) ) = i 4 -i 3 7

8 U D P J i t t e r O p e r at i on ( E x am p l e ) Simulating G.711 V o I P c all. Us e R T P / UD P p o r ts and ab o v e, th e p ac k e t s iz e is 172 b y te s ( 16 0 b y te s o f p ay lo ad, 12 b y te s f o r R T P h e ad e r ). P ac k e ts ar e s e nt e v e r y 2 0 millis e c o nd s ( d e f ault inte r v al). M ar k e d w ith D SC P v alue o f 8 ( T O S e q uiv ale nt 0 x 2 0 ). R uns e v e r y minute ( d e f ault f r e q ue nc y ) ip sla 1 u d p-j it t e r n u m -pac k e t s r e q u e st -d at a-siz e t o s 2 0 ip sla sc h e d u le 1 st ar t -t im e n o w A B C A = 2 0 m s B = 2 0 s ( x 2 0 m s ) C = 4 0 s ( 6 0 s 2 0 s ) 8

9 N et F l o w 9

10 M M M W h at i s N e t F l ow? NetFlow S u b inter f ace S u ppor t E g r es s NetFlow A ccou nting NetFlow v 9 NetFlow P L S E g r es s NetFlow P L S E g r es s NetFlow A ccou nting P L S A war e NetFlow NetFlow S u ppor t per V lan M ax imu m M as k A g g r eg ate O u tpu t NetFlow NetFlow M u lticas t S u ppor t NetFlow P olicy R ou ting NetFlow R eliab le E x por t ( S C TP ) O u tpu t S ampled NetFlow NetFlow B r id g ed Flow S tatis tics R and om S ampled NetFlow NetFlow A g g r eg ation NetFlow Data E x por t S ampled NetFlow Data E x por t NetFlow Dynamic Top NetFlow E x por t of B G P Nex t H op Talk er s C L I NetFlow M u ltiple E x por t NetFlow ex por t with B G P A S NetFlow I npu t Filter s NetFlow Data E x por t Flowmas k NetFlow TO S -b as ed NetFlow f or I P v 6 u nicas t Tr af f ic Flex ib le NetFlow R ou ter A g g r eg ation NetFlow I npu t Filter s with mu lti-s ampling r ates NetFlow L ayer 2 f or S ecu r ity M onitor ing NetFlow Data E x por t v er s ion 5 NetFlow M I B and Top Talk er s S ampled NetFlow NetFlow Top Talk er s NetFlow Data E x por t v er s ion 8 NetFlow Top Talk er s C L I NetFlow M inimu m P r ef ix M as k f or R ou ter - b as ed A g g r eg 10

11 Q V e r s i on 5 F l ow F or m at U sag e PP aa cc kk et CC ou nn t BB yy te CC ou nn t SS ou rc e II P P Address DD esti nn aa ti on II P P Address F rom/ To Ti me of D ay Port U ti li z ati on os SS ta rt sy su pt ii mm e EE nn d sy su pt ii mm e II nn pu t ii ff II nn dex OO uu tpu t ii ff II nn dex TT yy pe of SS erv ii cc e TT CC P P FF ll aa gg s PP rotoc ol SS ou rc e TT CC P P // UU DD P P PP ort DD esti nn aa ti on TT CC P P // UU DD P P PP ort Next Hop Address SS ou rc e AS Nu mm bb er DD est. AS Nu RR outi mm bb er ng SS ou rc e PP ref ii x MM aa sk DD est. PP ref ii x MM aa sk A p p li cati on R outi ng and Peeri ng Flow Keys 11

12 F l e x i b l e N e t F l ow H i g h L e v e l C on c e p t s an d A dv an t ag e s Flexible NetFlow feature allows user configurable NetFlow record form ats, selecting from a collection of fields: K e y N o n -k e y C o u n t e r T i m e s t a m p A dv antages: T a i l o r a c a c h e f o r s p e c i f i c a p p l i c a t i o n s, n o t c o v e r e d b y e x i s t i n g 2 1 N e t F l o w f e a t u r e s B e t t e r s c a l a b i l i t y s i n c e f l o w r e c o r d c u s t o m r e d u c e s n u m b e r o f f l o w s t o m o n i t o r D i f f e r e n t N e t F l o w c o n f i g u r a t i o n : P e r s u b i n t e r f a c e P e r d i r e c t i o n ( i n g r e s s / e g r e s s ) P e r s a m E t c. p l e r i z a t i o n f o r p a r t i c u l a r a p p l i c a t i o n 12

13 M M F l e x i b l e N e t F l ow M u l t i p l e M on i t or s w i t h U n i q u e K e y F i e l ds Traf f i c F l o w o n i t o r 1 F l o w o n i t o r 2 K ey F i el d s P ack et 1 N o n-k ey F i el d s K ey F i el d s P ack et 1 N o n-k ey F i el d s S o urce IP P ack ets S o urce IP P ack ets D es ti nati o n IP B y tes D es t IP T i m es tam ps S o urce P o rt 2 3 T i m es tam ps Input Interface E th ernet 0 D es ti nati o n O o rt N ex t H o p A d d res s S Y N F l ag 0 L ay er 3 P ro to co l T C P - 6 T O S B y te 0 Input Interface E th ernet 0 Tr af f ic A nalys is C ach e S ecu r ity A nalys is C ach e S o u r c e I P D e s t. I P S o u r c e P o r t 23 D e s t. P o r t I n p u t P r o t o c o l T O S I / F E P k t s 1100 S o u r c e I P D e s t. I P I n p u t I / F F l a g E P k t s

14 C on f i g u r e a U s e r -D e f i n e d F l ow R e c or d C onf i g ure the Ex p orter Router(config)#flow exporter my-e x p o r t e r Router(config-flow-exporter)#d es tina tion C onf i g ure the F low R ecord Router(config)#flow record my-r e c o r d Router(config-flow-record )#m a tch ipv 4 icm p ty pe Router(config-flow-record )#m a tch ipv 4 icm p cod e Router(config-flow-record )#collect counter b y tes C onf i g ure the F low M oni tor Router(config)#flow m onitor my-mo n i t o r Router(config-flow-m onitor)#exporter my-e x p o r t e r Router(config-flow-m onitor)#record my-r e c o r d C onf i g ure the I nterf ace Router(config)#int s 3 / 0 Router(config-if)#ip flow m onitor my-mo n i t o r input 14

15 M O O O I P v 4 I P ( S o u r c e o r D e s t i n a t i o n ) P r o t o c o l F r a g m F l a g s I D F l e x i b l e F l ow K e y P r e f i x ( S o u r c e o r D e s t i n a t i o n ) a s k ( S o u r c e o r D e s t i n a t i o n ) M i n i m u m -M a s k ( S o u r c e o r D e s t i n a t i o n ) F r a g m f f s e t e n t a t i o n e n t a t i o n To t a l L e n g t h P a y l o a d S i z e P a c k e t S e c t i o n ( H e a de r ) P a c k e t S e c t i o n ( P a y l o a d) TTL p t i o n s V e r s i o n P r e c e de n c e D S C P H e a de r L e n g t h TO S I n p u t R o ut i n g D e s t i n a t i o n A S P e e r A S Tr a f f i c I n de x F o r w a r di n g S t a t u s I s -M I G B G P N e x t H o p F l o w S a m P N e x t H o p I n t erf ac e u t p u t u l t i c a s t p l e r I D D i r e c t i o n T ran sp o rt D e s t i n a t i o n P o r t S o u r c e P o r t I C M I C M I G M P Ty p e TC P A C K N u m TC P H e a de r L e n g t h TC P W P C o de P Ty p e TC P S e q u e n c e N u m b e r b e r i n do w -S i z e TC P S o u r c e P o r t TC P D e s t i n a t i o n P o r t TC P U r g e n t P o i n t e r TC P F l a g : A C K TC P F l a g : C W TC P F l a g : E C E TC P F l a g : F I N TC P F l a g : P S H TC P F l a g : RS T TC P F l a g : S Y N TC P F l a g : U RG U D P M L e n g t h e s s a g e R U D P S o u r c e P o r t U D P D e s t i n a t i o n P o r t 15

16 F l e x i b l e F l ow N on -K e y A n y o f t h e p o t en t i al k ey f i el d : w i l l b e t h e v al ue o f t h e f i rst p ac k et i n t h e f l o w P l us C o un t ers T i m est am p I P v 4 B y te s B y te s L o ng B y te s Sq uar e Sum P ac k e t P ac k e t L o ng s y s Up T ime F ir s t P ac k e t s y s Up T ime F ir s t P ac k e t To t a l L e n g t h M i n i m u m To t a l L e n g t h M a x i m u m TTL M i n i m u m TTL M a x i m u m 16

17 17

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