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Сети FDDI. Выполнил студент ИТО-4-07 Лазарев Никита.

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Сети FDDI

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Fddi

FDDI

-4-07


Fddi

  • , , ( fastethernet) FDDI . FDDI (fiberdistributeddatainterface, ISO 9314-1, rfc-1512, -1390, -1329, -1285) (ansi), ISO. 100 / 100 2 . 10-9. FDDI (.1; a,b,c,d e -). ( -). ( IEEE 802.5 - TokenRing). FDDI (backbone) , . (DAS - dualattachedstation) . . (), ( ) , , ( - .1 ). (SAS - singleattachedstation), . .


Fddi

FDDI

.1 FDDI


Fddi

  • FDDI , - , .

  • FDDI 4500 , , , 4470 . RFC-1188 256 , 4096 . , FDDI . 576 , , .

  • (datalinkservice) IEEE 802.2 logicallinkcontrol (LLC). :


Fddi

  • IP/ARP

  • 802.2 llc

  • FDDI MAC

  • FDDI PHY

  • FDDI PMD

    MAC(mediaaccesscontrol) , , , crc . PHY(physicallayerprotocol) /, , . 4b/5b ( 4- 5-), - NRZI. PMD (physicallayermedium) , , , , . MAC PHY . 2.


Fddi

FDDI

. 2. FDDI


Fddi

IP-, ARP- , FDDI, 802.2 LLC SNAP (subnetwork access protocol; . . 3 4), FDDI MAC. snap , , SNAP- Ethertype. 24- (organization code) snap , 16 Ethertype

802.2 LLC 1 ( , DSAP (destination service access point) SSAP (source service access point) 802.2, SAP (service access point) SNAP.


Fddi

. 3.

LLC- SNAP- 8 .

k1 170 .k2 0. 3 ( ).

16- 48- FDDI- 32- IP- ARP. 1 2 . FDDI MAC 4500 , 16- . 11111, 1100010001, - 0110101101 ( 5- ). CRC , .


Fddi

FDDI

. 4. FDDI

8 LLC/SNAP , (MTU) 4470 (4478) . IP- ARP- . FDDI , - , . 5. .


Fddi

. 5. -

802.2 I LLC (UI), exchange identification (XID), test. XID test, .

SSAP-. - SSAP- 1. UI- LLC 3.

/ XID LLC, 175 ( ) poll/final=0 191 poll/final=1. LLC / test 227, poll/final=0, 243 poll/final=1.


Fddi

  • UI poll=1 . UI, snapsap DSAP- SSAP-, IP ARP.

  • XID test . , DSAP SNAP SAP (170), null SAP (0), global SAP (255). DSAP .

  • XID test, final poll . XID 802.2 XID 129.1.0, 1 ( ).

  • test test.

  • . , . - FDDI , TokenRing. FDDI . , . (TRT tokenrotationtime), , . TTRT (targettokenrotationtime).


Fddi

  • TRT TTRT TRT> TTRT. THT (tokenholdtimer). , TRT THT, . , THT TTRT. THT (), (THT , ).

  • IEEE , . , . .


Fddi

  • , . . (, , ) ( ). 8-9 ( 2 , 500/). 1 10 , 2 - 40 1 /. fddi (), . 1350 1500 . 50/125 62.5/125 ( - ; - ; ). , 11 , . ( 2 10,5 ). , , 2 .


Fddi

  • , , 0,3 . ( 2.5-4 ). . , , 62.5/125 . ( , ). , fddi, ,


Fddi

  • FDDI- , IEEE 802.2 (LLC - logicallinkcontrol), , Ethernet-. FDDI ethernet , FDDI Ethernet . FDDI Ethernet (, DEC LAT ). (brouter), , . , . , FDDI 400000 , .


Fddi

  • , FDDI. SAS- FDDI-, . , 1,5 , 2,5 ( ). , FDDI , , . , . FDDI TokenRing ( ).


Fddi

  • : DAS SAS. , . FDDI. , (, CAD, CAM ).

  • , FDDI-, (internetworknodalprocessor - INP), frontendprocessor (FEP). INP, , , , . INP . FDDI- SNMP MIB. , , . FDDI- , DAS- (<500). , , , .


Fddi

. 6 FDDI . 1 2 Ethernet (10 /). , FDDI 100 /, 10 . FDDI, . 6, . FDDI , Ethernet , Ethernet ( 100 ). FDDI . FDDI .


Fddi

  • ( ) ( ) .


Fddi

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