1. Space and Speed Tradeoffs in TCAM Hierarchical Packet Classification
Author:
Alex Kesselman, Kirill Kogan,
Sergey Nemzer, Michael Segal.
Publisher:
Sarnoff Symposium, 2008
Presenter: Chun-Yi Lee
Date: 2009/08/11

2. Outline Introduction Model Description Space Optimization
Speed Optimization
Conclusion

3. Introduction Hierarchical Packet Classification on Traffic Control
Hierarchical packet classification is a crucial mechanism necessary to support many Internet services such as QoS provisioning, traffic policing, and network intrusion detection. 3

4. Introduction Routing for multiple providers Internet Provider 1
interface1
Local
Network
Router
Internet
interface2
Provider 2 4

5. Introduction Hierarchical Packet Classification packet 1 packet 2
execute
action
packet 1
Rule 1
Rule 2
Rule 3
match
match
match
packet 2
Rule 1
Rule 2
Rule 3
match
match
execute default
action 5

6. Model Description Filter Type Exact match Prefix match Range match
A packet header field Hi exactly matches the filter Fi if and only if Hi = Fi.
Prefix match
A packet header field Hi is a prefix match for the filter Fi if and only if the |Fi| bits of Hi are equal to Fi.
Range match
A packet header field Hi range matches the filter Fi if and only if Fi.min≦ Hi≦ Fi.max. 6

7. Model Description Classes and Policy C21 C31 Rule 1 Rule 1 C11 C22
packet
Rule 2
Rule 2
Rule 1
Rule 1
Rule 3
C23
C33
Rule 1
Rule 1 7

8. Model Description Classes and Policy C11 C22 Rule 1 C32 C41 Rule 1
packet
Rule 2
Rule 2
Rule 1
Rule 1
Rule 3
policy depth = 4 8