When the controller does not want the switch to make its own decision in removing the flow entries, then the controller can use the vacancy mechanism. In this mechanism, the switch informs the controller whenever the switch's resources (especially the number of flow table entries) are reaching some threshold value, called the vacancy threshold. Unlike the eviction mechanism, wherein the switch itself removes the flow entry from the flow table, when the vacancy is enabled, the switch informs the controller about this. This mechanism enables of the controller to delete or modify the existing flow entries in the system whenever the switch reaches its threshold point.
OpenFlow Cookbook
OpenFlow Cookbook
Overview of this book
Table of Contents (17 chapters)
Preface
Free Chapter
1. OpenFlow Channel Connection Establishment (Part 1)
1. OpenFlow Channel Connection Establishment (Part 2)
2. Symmetric Messages and Asynchronous Messages (Part 1)
2. Symmetric Messages and Asynchronous Messages (Part 2)
3. Flow Table and Flow Entry Modification Messages (Part 1)
3. Flow Table and Flow Entry Modification Messages (Part 2)
4. Group Table and Meter Table Modification Messages (Part 1)
4. Group Table and Meter Table Modification Messages (Part 2)
5. Handling Multipart Statistics Messages (Part 1)
5. Handling Multipart Statistics Messages (Part 2)
6. Handling Multipart State Information Messages (Part 1)
6. Handling Multipart State Information Messages (Part 2)
7. Handling Bundle Messages (Part 1)
7. Handling Bundle Messages (Part 2)
A. Common OpenFlow Headers, Structures, and Error Code
Index
Customer Reviews