Performing configuration management and handling configuration drift is one of the main features of a higher-level management system or orchestrator. The configuration management tasks are not concerned about the state data and focus on effective retrieval and push of the configuration values.
Thus, having a synchronized configuration view between the management system and the network elements is key to enabling robust and near real-time configuration management.
To enable this synchronization of configuration data, gNMI Subscribe RPC can be used. The bidirectional streaming nature of this RPC enables fast and reliable sync between the management system and the devices it manages.
Unfortunately, gNMI Subscribe RPC does not have an embedded mechanism to stream updates for the configuration values only as opposed to the Get RPC, which makes this RPC rather ineffective on YANG schemas that do not employ a separation of config and state elements by using distinct containers.
This proposal introduces the Config Subscription extension that allows clients to indicate to servers that they are interested in configuration values only.
github.com/ope...
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