The tFilterEmbedOpenflowOperStateChg notification is generated when the operational state of an open-flow switch embedded in a filter with scope other than 'embedded' has changed. [CAUSE] This notification may be triggered for the following reasons: 1) An attempt to embed an open-flow switch into an embedding filter was done. 2) An attempt to recover an open-flow embedding that is operationally down was done. 3) An attempt to change the admin state of an open-flow embedding was done. 4) The operational state of an open-flow embedding has changed to inactive due to lack of resources. [EFFECT] The effect depends on the new state. If the new state is 'active', the embedding of an open-flow switch was successful. If the new state is 'embedFailedNoResources' the embedding was not successful due to lack of resources. If the new state is 'inactive' and the previous state was 'active' then the open-flow switch entries were removed. Otherwise the embedding filter was not changed. [RECOVERY] If the new state is 'active' or 'inactive', no action is required. If the new state is 'embedFailedNoResources', an attempt to recover the operational state can be done by removal and reapplication of the open-flow embedding.