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Data Center N etw o rk i ng Env i ro nm ent� Clustered and Grid apps are becoming more common� M ulti-Core CP U arch itectures and serv er v irtualiz ation is driv ing th e need f or more bandw idth per serv er
� N etw ork traf f ic is:Client to S erv er, S erv er to S erv er, S erv er to S torage and S torage to S torage
� H igh er dependency of A pplication perf ormance on netw ork perf ormance
� B andw idth and L atency matter� T raf f ic ch aracteriz ation includes:
S h ort and bursty messages: client to serv er and serv er to serv er & L ong steady messages: serv er to storage and storage to storage
� P ack et “drop” af f ects most traf f ic ty pes� F lat N etw ork s are common
D a ta C en ter E th ern et is a n a rch itectu ra l col l ection of E th ern et ex ten sion s d esig n ed to im p rove E th ern et n etworkin g a n d m a n a g em en t in th e D a ta C en ter. C isco is sh owin g in n ova tion wh il e workin g th rou g h th e sta n d a rd iz a tion p rocess with th ese ex ten sion s in op en sta n d a rd s f oru m s.
� Ena bles lossless F a bri cs f or ea ch cla ss of serv i ce� P A U S E sent p er v i rtu a l la ne w hen bu f f ers li m i t ex ceed ed� N etw ork resou rces a re p a rti ti oned betw een V L ’s ( E. g . i np u tbu f f er a nd ou tp u t q u eu e)
� T he sw i tch beha v i or i s neg oti a ble p er V L
P riority -B ased F low Control ( P F C)P riority -B ased F low Control ( P F C)
Data Center Ethernet F eatu resCongestion M anagementCongestion M anagement
� M ov es cong esti on ou t of the core to a v oi d cong esti on sp rea d i ng� A llow s End -to-End cong esti on m a na g em ent� S ta nd a rd s tra ck i n 8 0 2. 1Q a u
Data Center Ethernet F eatu resD ata Center B ridging Capability eX ch ange P rotocolD ata Center B ridging Capability eX ch ange P rotocol
H a nd sha ki ng N eg oti a ti on f or:� C oS BW M a na g em ent� C la ss Ba sed F low C ontrol� C ong esti on M a na g em ent ( BC N /Q C N )� A p p li ca ti on ( u ser_ p ri ori ty u sa g e)� L og i ca l L i nk D ow n
Data Center Ethernet F eatu resL ay er 2 M ulti-P ath ing optionsL ay er 2 M ulti-P ath ing options
L A N
Active-Active
M ACB
M ACA
M ACA
M ACB
L A N L A N
vP CL 2 E C M P
L 2 E C M P
11 22 33
� El i m i na tes S T P o n U p l i nkB ri d g e P o rts
� A l l o w s M u l ti p l e A c ti v eU p l i nk s S w i tc h to N etw o rk
� P rev ents L o o p s b y P i nni ng aM A C A d d res s to O nl y O neP o rt
� C o m p l etel y T ra ns p a rent toN ex t H o p S w i tc h
� V i rtu a l S w i tc h reta i ns p hy s i c a l s w i tc hes i nd ep end ent c o ntro l a nd d a ta p l a nes� V i rtu a l p o rt c ha nnel m ec ha ni s m i s tra ns p a rent to ho s ts o r s w i tc hes c o nnec ted to the v i rtu a l s w i tc h� S T P a s f a i l -s a f e m ec ha ni s m to p rev ent l o o p s ev en i n the c a s e o f c o ntro l p l a ne f a i l u re
� U s es I S I S b a s ed to p o l o g y� El i m i na tes S T P f ro m L 2d o m a i n
A Unified fa b r ic is t h e end s t a t e net w o r k w h er e L A N , S A N , a nd I P C t r a ffic a r e c o nv er g ed o nt o a s ing l e net w o r k infr a s t r u c t u r e
D a t a C ent er E t h er net is t h e fo u nda t io n fo r del iv er ing a Unified F a b r ic . D C E w il l a l s o a p p ea l t o c u s t o m er s t h a t a r e no t p l a nning fo r c o ns o l ida t ed I / O du e t o it s L 2 m u l t ip a t h ingc a p a b il it ies a nd it s l o s s l es s s er v ic e b eh a v io r
D C E c o m p r is es a s et o f E t h er net enh a nc em ent s t a nda r ds t h a t a dh er e t o t h e em er g ing I E E E D a t a C ent er B r idg ing s p ec ific a t io n.
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