Update gnmi-commit-confirmed.md as per openconfig#197

Updating the proposal as per the Proposal-1 of in [openconfig#197](openconfig#197)

rpc/gnmi/gnmi-commit-confirmed.md

@@ -16,43 +16,59 @@ hence we cannot assume
 This feature provides a way to auto rollback the applied configuration after a
 centain duration if a bad configuration was pushed.
 
-# 2. Definition
+# 2. Summary
+The proposed proto has a subset of confirmed commit functionality as defined in
+NETCONF protocol([RFC6241](https://datatracker.ietf.org/doc/html/rfc6241#section-8.4)). The proposal has a healthy disregard to few functionality
+defined in the RFC with the intention that most of the gRPC API clients are going to
+be automated systems and the proto should facilitate a simpler implementation of
+client workflows and server implementation.
+
+The server can be viewed as a singleton resource, at any given point in time there
+can be only one commit active. This commit can be either confirmed or canceled
+before a new commit can begin. Client is expected to provide full configuration
+during the commit request, the commit cannot be amended once issued.
+
+# 3. Definition
 
 A `Commit` message is embedded the Extension message of the SetRequest proto.
 
-## 2.1 Proto
+## 3.1 Proto
 
 ```
 message Commit {
   google.protobuf.Duration rollback_duration = 1;
-  bool confirm = 2;
+  oneof id { 
+   string commit_id = 2;
+   string confirm_id = 3;
+   string cancel_id = 4;
+  }
 }
 ```
 
-## 2.2 SetRequest handling
+## 3.2 SetRequest handling                                                        
 
-### 2.2.1 Commit
-If the *rollback_duration* field is set in SetRequest RPC, the server shall commit the configuration and wait until the
-specified duration to initiate a rollback of the configuration unless there is another SetRequest RPC with *confirm* set
-to true. If the second call is not received with confirm set to true the server shall rollback the committed
-configuration.
+### 3.2.1 Commit
+A commit can be initiated by setting the `rollback_duration` field and `commit_id` in the extension.
+If `commit_id` is passed without `rollback_duration` a default duration of 10min is chosen.
 
-### 2.2.2 Confirm
+If the server is already waiting for a confirmation, the server returns with FAILED_PRECONDITION error.
 
-During the *confirm* call the client should send the same configuration in the SetRequest spec along with
-the *confirm* field set to true.
+If `rollback_duration` is passed without `commit_id`, an INVALID_ARGUMENT error is returned.
 
-If the confirm call is issued with a different configuration, a FAILED_PRECONDITION error is returned.
+If a SetRequest call is made without extension whilst the existing rollback counter is running then a
+FAILED PRECONDITION error is returned.
 
-The confirm call can only be issued if the server is waiting for confirmation. If a SetRequest RPC is received with the
-*confirm* field set to true but the server is not waiting for a confirmation then an FAILED_PRECONDITION error is
-returned.
+### 3.2.2 Confirm
 
-### 2.2.3 Multiple SetRequest
+Confirmation can be issued by setting the `confirm_id` to a value equivalent to the commit id of the
+on-going commit which needs confirmation.
 
-If a subsequent SetRequest RPC is received with the *rollback_duration* field set, whilst an existing rollback counter
-is running, the server shall return a FAILED_PRECONDITION error.
+If the server is not waiting for a confirmation or if the value doesn’t match the on-going commit then
+FAILED_PRECONDITION or INVALID_ARGUMENT error is returned respectively.
 
-If a SetRequest call is made without extension whilst the existing rollback counter is running then a
-FAILED PRECONDITION error is returned.
+### 3.2.3 Cancel
+Cancellation can be issued by setting the `cancel_id` to a value equivalent to the commit id of the
+on-going commit.
 
+If the server is not waiting for a confirmation or if the value doesn’t match the on-going commit
+then FAILED_PRECONDITION or INVALID_ARGUMENT error is returned respectively.