UNIFIED REPLICATION MECHANISM FOR FAULT-TOLERANCE OF STATE

摘要

A network control system that achieves high availability for forwarding state computation within a controller cluster by replicating different levels of table state between controllers of the controller cluster. To build a highly available controller cluster, the tables for storing the forwarding state are replicated across the controllers. In order to take responsibility for a slice, the slave controller of some embodiments performs merging of replicated state on a slice-by-slice basis. The merging is performed in a manner to prevent disruptions to the network state while the slave controller is updated.

主权项

1. For a first controller instance that manages a first set of forwarding elements implementing logical datapath sets of a network control system, a machine-readable medium storing a program executable by at least one processing unit of the first controller instance, the program comprising sets of instructions for:
maintaining a first set of forwarding state data that represents a forwarding state of the first set of forwarding elements; receiving a second set of forwarding state data that represents a forwarding state of a second set of forwarding elements from a second controller instance; and merging the second set of forwarding state data into the first set of forwarding state data.