Chapter 26 IP over ATM
CONTENTS <ul><li>ATM WANS </li></ul><ul><li>CARRYING A DATAGRAM IN CELLS </li></ul><ul><li>ROUTING THE CELLS </li></ul><ul...
ATM  WANS 26.1
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 26.2
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 value of the PT field  is 000 in all cells  carrying an IP datagram  fragment except for the last cell;  the value is ...
Figure  26-7 ATM cells
ROUTING  THE CELLS 26.3
Figure  26-8 Entering-point and exiting-point routers
ATMARP 26.4
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) 26.5
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 eac...
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Ch26

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Ch26

  1. 1. Chapter 26 IP over ATM
  2. 2. CONTENTS <ul><li>ATM WANS </li></ul><ul><li>CARRYING A DATAGRAM IN CELLS </li></ul><ul><li>ROUTING THE CELLS </li></ul><ul><li>ATMARP </li></ul><ul><li>LOGICAL IP SUBNET (LIS) </li></ul>
  3. 3. ATM WANS 26.1
  4. 4. Figure 26-1 An ATM WAN in the Internet
  5. 5. Figure 26-2 ATM layers in routers and switches
  6. 6. End devices such as routers use all three layers, while switches use only the bottom two layers.
  7. 7. Figure 26-3 AAL5
  8. 8. The AAL layer used by the IP protocol is AAL5.
  9. 9. Figure 26-4 ATM layer
  10. 10. Figure 26-5 ATM headers
  11. 11. CARRING A DATAGRAM IN CELLS 26.2
  12. 12. Figure 26-6 Fragmentation
  13. 13. 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.
  14. 14. 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.
  15. 15. Figure 26-7 ATM cells
  16. 16. ROUTING THE CELLS 26.3
  17. 17. Figure 26-8 Entering-point and exiting-point routers
  18. 18. ATMARP 26.4
  19. 19. Figure 26-9 ARP packet
  20. 20. Figure 26-10 Binding with PVC
  21. 21. The inverse request and inverse reply messages can bind the physical address to an IP address in a PVC situation.
  22. 22. Figure 26-11 Binding with ATMARP
  23. 23. The request and reply message can be used to bind a physical address to an IP address in an SVC situation.
  24. 24. Figure 26-12 Building a table
  25. 25. The inverse request and inverse reply can also be used to build the server’s mapping table.
  26. 26. LOGICAL IP SUBNET (LIS) 26.5
  27. 27. Figure 26-13 LIS
  28. 28. LIS allows an ATM network to be divided into several logical subnets. To use ATMARP, we need a separate server for each subnet.

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