TAILIEUCHUNG - 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. | Chapter 26 IP over ATM CONTENTS ATM WANS CARRYING A DATAGRAM IN CELLS ROUTING THE CELLS ATMARP LOGICAL IP SUBNET (LIS) ATM WANS Figure 26-1 An ATM WAN in the Internet Figure 26-2 ATM layers in routers and switches End devices such as routers use all three layers, while switches use only the bottom two layers. Figure 26-3 AAL5 The AAL layer used by the IP protocol is AAL5. Figure 26-4 ATM layer Figure 26-5 ATM headers CARRING A DATAGRAM IN CELLS Figure 26-6 Fragmentation 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. 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. Figure 26-7 ATM cells ROUTING THE CELLS Figure 26-8 Entering-point and exiting-point routers ATMARP Figure 26-9 ARP packet Figure 26-10 Binding with PVC The inverse request and inverse reply messages can bind the physical address to an IP address in a PVC situation. Figure 26-11 Binding with ATMARP The request and reply message can be used to bind a physical address to an IP address in an SVC situation. Figure 26-12 Building a table The inverse request and inverse reply can also be used to build the server’s mapping table. LOGICAL IP SUBNET (LIS) Figure 26-13 LIS LIS allows an ATM network to be divided into several logical subnets. To use ATMARP, we need a separate server for each subnet.

• Quản trị mạng
• TCP IP protocol suite
• Lecture TCP IP protocol suite
• Network layer
• Internet protocol
• Carrying a datagram in cells
• Logical IP Subnet