Closes #1374: Added NAPALM_ARGS and NAPALM_TIMEOUT configiuration parameters

docs/configuration/optional-settings.md

@@ -139,12 +139,44 @@ An API consumer can request an arbitrary number of objects by appending the "lim
 
 ## NAPALM_PASSWORD
 
-NetBox will use these credentials when authenticating to remote devices via the NAPALM library. Both parameters are optional.
+NetBox will use these credentials when authenticating to remote devices via the [NAPALM library](https://napalm-automation.net/), if installed. Both parameters are optional.
 
 Note: If SSH public key authentication has been set up for the system account under which NetBox runs, these parameters are not needed.
 
 ---
 
+## NAPALM_ARGS
+
+A dictionary of optional arguments to pass to NAPALM when instantiating a network driver. See the NAPALM documentation for a [complete list of optional arguments](http://napalm.readthedocs.io/en/latest/support/#optional-arguments). An example:
+
+```
+NAPALM_ARGS = {
+    'api_key': '472071a93b60a1bd1fafb401d9f8ef41',
+    'port': 2222,
+}
+```
+
+Note: Some platforms (e.g. Cisco IOS) require an argument named `secret` to be passed in addition to the normal password. If desired, you can use the configured `NAPALM_PASSWORD` as the value for this argument:
+
+```
+NAPALM_USERNAME = 'username'
+NAPALM_PASSWORD = 'MySecretPassword'
+NAPALM_ARGS = {
+    'secret': NAPALM_PASSWORD,
+    # Include any additional args here
+}
+```
+
+---
+
+## NAPALM_TIMEOUT
+
+Default: 30 seconds
+
+The amount of time (in seconds) to wait for NAPALM to connect to a device.
+
+---
+
 ## NETBOX_USERNAME (Deprecated)
 
 ## NETBOX_PASSWORD (Deprecated)