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Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Capitolo 8 Funzionalità avanzate degli switch di livello.

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Presentation on theme: "Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Capitolo 8 Funzionalità avanzate degli switch di livello."— Presentation transcript:

1 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Capitolo 8 Funzionalità avanzate degli switch di livello 2

2 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Switching Fabric CPU e RAM Interfaccia

3 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Uscite Ingressi

4 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl StraightCross

5 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl

6 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Rete

7 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Rete

8 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Modello ISO/OSI MAC Control (opzionale) MAC - Media Access Control Sottolivello LLC Sottolivelli per LAN 802 Applicazione Presentazione Sessione Trasporto Rete Data Link Fisico

9 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 0 (default) 1 2 3 4 5 6 7 BE BK -- EE CL VI VO NC Best Effort Background non definita Excellent Effort Controlled Load Video, < 100 ms latenza e jitter Voice, < 10 ms latenza e jitter Network Control User Priority Sigla Tipo di traffico

10 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1234567812345678 Coda Tipo di traffico prioritaria BK ----BEEECLVIVONC BK BEEECLVIVONC BK BEEECLVI VO BK BECLVI VO BK BE CL VO BE CL VO BE VO BE

11 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Informazione porta mittente Informazione porta destinatario Filtering Database Ricezione tramaScarto trama Trasmissione trama 123 Code 456 1 Filtering Frames 2 Enforcing topology restriction 3 Queueing Frames 4 Selecting frames for transmission 5 Mapping priority 6 Recalculating FCS

12 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 ottetto 6 ottetti 2 ottetti 42 ottetti Destination Address (01-80-C2-00-00-01) Source Address Legth/Type = 8808 OpCode = 00-01 (PAUSE) Pause_time (pause-quanta) PAD (tutti 0) FCS 4 ottetti

13 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl rsvd FD HDPS1PS2rsvd RF1RF2Ack NP D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 0 0 No Pause 0 1 Asymmetric Pause verso il link partner 1 0 Symmetric Pause 1 1 Symmetric Pause e Asymmetric Pause (tipo Both) verso il local device 0 0 No error, Link OK 0 1 Offline 1 0 Link Failure 1 1 Auto-Negotiation Error Technology Ability Field

14 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Bit(s) Nome Descrizione Default R/W 15 Next Page Constant 0 = trasmissione della pagina con le capacità 0 RO primarie 14 Reserved Riservato. Deve essere impostato al valore 0. 0 RO 13 Remote Fault 1 = malfunzionamento al lato opposto del collegamento0 RW 0 = nessun malfunzionamento 12:5 Technology AbilityCampo di 8 bit contenente informazioni sulle 00101111RW Fieldfunzionalità specifiche delle tecnologie identificate dal valore del campo selector field cui si offre supporto. 4:0 Selector Field Campo di 5 bit che identifica il tipo di messaggio 00001 RO inviato per la negoziazione. Nel circuito Intel 82559 questo campo non è scrivibile (read only) e contiene il valore 00001b che indica lo standard IEEE 802.3. Register 4: Auto-Negotiation Advertisement Register

15 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 0 0 Dont Dont Disable PAUSE Disable PAUSE care care TX & RX TX & RX 0 1 0 Dont Disable PAUSE Disable PAUSE care TX & RX TX & RX 0 1 1 0 Disable PAUSE Disable PAUSE TX & RX TX & RX 0 1 1 1 Enable PAUSETX Enable PAUSERX Disable PAUSERX Disable PAUSETX 1 0 0 Dont Disable PAUSE Disable PAUSE care TX & RX TX & RX 1 Dont care 1 Dont care Enable PAUSE Enable PAUSE TX & RX TX & RX 1 1 0 0 Disable PAUSE Disable PAUSE TX & RX TX & RX 1 1 0 1 Enable PAUSERX Enable PAUSETX Disable PAUSETX Disable PAUSERX Local DeviceLink Partner Bit - PS1Bit - PS2Bit - PS1Bit - PS2 Local Device resolution Link Partner resolution Asymmetric PauseBoth Sym & Asym PauseAsymmetric Pause Symmetric or Both Asymmetric PAUSE Symmetric or Both Both Sym & Asym PauseAsymmetric PAUSE

16 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Buffer Interfaccia Verso la CPU Soglia di pausa Saturazione buffer Buffer Interfaccia Soglia di pausa Saturazione buffer Invio pause Verso la CPU pause Calcolatore veloce Controllo di flusso asimmetrico Calcolatore lento

17 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Buffer Interfaccia Soglia di pausa Saturazione buffer Invio pause Verso la CPU pause Controllo di flusso simmetrico Buffer Interfaccia Soglia di pausa Saturazione buffer Invio pause Verso la CPU pause

18 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 100 Mb/s Sym. or Both Pause Controllo di flusso simmetrico PC-7 PC-8 PC-5

19 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 Output Buffer porta 4 Buffer Interfaccia Verso la CPU Soglia di pausa Saturazione Buffer 100 Mb/s Soglia di pausa Saturazione Buffer PC-7 PC-8 PC-5

20 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 Pause Buffer Interfaccia Soglia di pausa Saturazione Buffer Invio Pause Verso la CPU 100 Mb/s Output Buffer porta 4 Soglia di pausa Saturazione Buffer PC-7 PC-8 PC-5

21 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 Buffer Interfaccia Soglia di pausa Saturazione Buffer Verso la CPU 100 Mb/s Output Buffer porta 4 Soglia di pausa Saturazione Buffer PC-7 PC-8 PC-5

22 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 Pause Buffer Interfaccia Soglia di pausa Saturazione Buffer Invio Pause Verso la CPU 100 Mb/s Output Buffer porta 4 Soglia di pausa Saturazione Buffer PC-7 PC-8 PC-5

23 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 Buffer Interfaccia Soglia di pausa Saturazione Buffer Verso la CPU 100 Mb/s Output Buffer porta 4 Soglia di pausa Saturazione Buffer Invio Pause Pause PC-7 PC-8 PC-5

24 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 Buffer Interfaccia Soglia di pausa Saturazione Buffer Verso la CPU 100 Mb/s Output Buffer porta 4 Soglia di pausa Saturazione Buffer PC-7 PC-8 PC-5

25 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 2 1 4 3 Buffer Interfaccia Soglia di pausa Saturazione Buffer Verso la CPU 100 Mb/s PC-7 PC-8 PC-5 Buffer Interfaccia Soglia di pausa Saturazione Buffer Verso la CPU

26 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Stazione lenta Asym. Pause Both Pause Sym. or Both Pause Stazione veloce Stazione lenta Asym. Pause Both Pause Symmetric flow control Asymmetric flow control

27 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 1 3 4 5 7 8 9 2 1 9 Server-A PC-X Server-B PC-Y Server-C 1 Gb/s 10 Switch-1 Switch-2 Switch-3

28 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 1 3 4 5 7 8 9 2 1 9 Server-A PC-X Server-B Pause Server-C PC-Y 1 Gb/s 10 Switch-1 Switch-2 Switch-3

29 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 1 3 4 5 7 8 9 2 1 9 Server-A PC-X Server-B Pause Server-C PC-Y 1 Gb/s 10 Switch-1 Switch-2 Switch-3 Blocca tutti i flussi !

30 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 1 3 4 5 7 8 9 2 1 910 Server-A PC-X Server-B Server-C PC-Y 1 Gb/s Symmetric flow control Switch-1 Switch-2 Switch-3 Saturaz. Input Buffer porta 1 Pause

31 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 1 3 4 5 7 8 9 2 1 910 Server-A PC-X Server-B Server-C PC-Y 1 Gb/s Switch-1 Switch-2 Switch-3 Pause

32 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 1 3 4 5 7 8 9 2 1 910 Server-A PC-X Server-B Server-C PC-Y 1 Gb/s Controllo di flusso simmetrico Switch-1 Switch-2 Switch-3

33 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 1 3 4 5 7 8 9 2 1 910 Server-A PC-X Server-B Server-C PC-Y 1 Gb/s Controllo di flusso asimmetrico NIENTE controllo di flusso Switch-1 Switch-2 Switch-3 Controllo di flusso asimmetrico

34 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Applicazione Presentazione Sessione Trasporto Rete Data Link Fisico Modello ISO/OSI Sottolivelli per LAN 802.3 Link Aggregation Sublayer (opzionale) Sottolivello LLC MAC Control opzionale MAC Fisico MAC Control opzionale MAC Fisico MAC Control opzionale MAC Fisico

35 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Actor A - Partner B A B Actor B - Partner A

36 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Actor A - Partner B A B Actor B - Partner A Actor A - Partner B A B Actor B - Partner A Normale funzionamento Caso di guasto

37 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Control Parser/MUX MAC Control MAC Fisico MAC Control MAC Fisico MAC Control MAC Fisico Aggregator Parser/MUX Marker Responder Frame Collector Marker Generator/ Receiver (opzion.) Frame Distributor Frame CollectionFrame Distribution MAC Client Link Aggregation Control Link Aggregation Control Protocol Marker Frames MAC Client Frames Marker Frames MAC Client Frames Aggregator Aggregation Control Link Aggregation Sublayer

38 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 6 ottetti 2 ottetti 1 ottetto 2 ottetti 108 ottetti 1 ottetto Destination Address (01-80-C2-00-00-02) Source Address Legth/Type = 88-09 SubType 1 o 2 Version LACP Info FCS 4 ottetti 1 = Link Aggregation Control Protocol 2 = Link Aggregation Marker Protocol

39 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Source MAC Address 00-00-00-00-00-010101Link 2 Destination MAC Addr. 00-00-00-00-00-0400 Source MAC Address 00-00-00-00-00-021011Link 4 Destination MAC Addr. 00-00-00-00-00-0501 Source MAC Address 00-00-00-00-00-031100Link 1 Destination MAC Addr. 00-00-00-00-00-0711 Source MAC Address 00-00-00-00-00-061010Link 3 Destination MAC Addr. 00-00-00-00-00-0800 Coppie di indirizzi MAC Ultimi Risultato Link mittente e destinazione 2 bit XOR Scelto

40 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl Alternate RSTP IEEE 802.1w

41 Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl 1 3 Host Membership Report (G,g) Host Membership Query (H,h) R Indirizzo Ethernet corrispondente a H Indirizzo IP multicast di tutte le stazioni 2 Host Membership Report (F,f) 4 5 6 7 Host Membership Report (I,i) 11 11 11 22 22 22 33 33 33 44 Forwarding table f1,2,3 i1,3 f1,2,3 i1,3 Forwarding table f1,2,3 g1,3 i1,2,3 f1,2,3 g1,3 i1,2,3 Forwarding table f1,2,4 g1,3 i1,3,4 f1,2,4 g1,3 i1,3,4 A B C D E

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