Lecture TCP-IP protocol suite - Chapter 26: IP over ATM

Upon completion you will be able to: Review the features of an ATM WAN, understand how an a datagram can pass through an ATM WAN, understand how an IP packet is encapsulated in cells, understand how cells are routed in an ATM network, understand the function of ATMARP.
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Lecture TCP-IP protocol suite - Chapter 26: IP over ATM Chapter26 IP over ATMMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 CONTENTS •ATMWANS •CARRYINGADATAGRAMINCELLS •ROUTINGTHECELLS •ATMARP •LOGICALIPSUBNET(LIS)McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 26.1 ATM WANSMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure261 AnATMWANintheInternetMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure262 ATMlayersinroutersandswitchesMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 End devices such as routers use all three layers, while switches use only the bottom two layers.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure263 AAL5McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 The AAL layer used by the IP protocol is AAL5.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure264 ATMlayerMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure265 ATMheadersMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 26.2 CARRING A DATAGRAM IN CELLSMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure266 FragmentationMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 Only the last cell carries the 8-byte trailer added to the IP datagram. Padding can be added only to the last cell or the last two cells.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 The value of the PT field is 000 in all cells carrying an IP datagram fragment except for the last cell; the value is 001 in the last cell.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure267 ATMcellsMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 26.3 ROUTING THE CELLSMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure268 EnteringpointandexitingpointroutersMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 26.4 ATMARPMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure269 ARPpacketMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure2610 BindingwithPVCMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000