tools: nfdc help command
refs #3780
Change-Id: Ibd0e37bad127a38e582864fadd81afadc74baf48
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+nfdc-route
+==========
+
+SYNOPSIS
+--------
+| nfdc route [list]
+| nfdc fib [list]
+| nfdc register [-I] [-C] [-c <cost>] [-e <expiration>] [-o <origin>] <prefix> <faceId|faceUri>
+| nfdc unregister [-o <origin>] <prefix> <faceId>
+
+DESCRIPTION
+-----------
+In NFD, the routing information base (RIB) stores static or dynamic routing information
+registered by applications, operators, and NFD itself.
+Each *route* in the RIB indicates that contents under a name prefix may be available via a nexthop.
+A route contains a name prefix, a nexthop face, the origin, a cost, and a set of route inheritance flags;
+refer to NFD Management protocol for more information.
+
+The **nfdc route list** command shows a list of routes in the RIB.
+
+The **nfdc fib list** command shows the forwarding information base (FIB),
+which is calculated from RIB routes and used directly by NFD forwarding.
+
+The **nfdc register** command adds a new route.
+If a route with the same prefix, nexthop, and origin already exists,
+it is updated with the specified cost, expiration, and route inheritance flags.
+
+The **nfdc unregister** command removes a route with matching prefix, nexthop, and origin.
+
+OPTIONS
+-------
+-I
+ Unset CHILD_INHERIT flag in the route.
+
+-C
+ Set CAPTURE flag in the route.
+
+-c <cost>
+ The administrative cost of the route.
+ The default is 0.
+
+-e <expiration>
+ Expiration time of the route, in milliseconds.
+ When the route expires, NFD removes it from the RIB.
+ The default is infinite, which keeps the route active until the nexthop face is destroyed.
+
+-o <origin>
+ Origin of the route, i.e. who is announcing the route.
+ The default is 255, indicating a static route.
+
+<prefix>
+ Name prefix of the route.
+
+<faceUri>
+ An URI representing the remote endpoint of a face.
+ It can be used in **nfdc register** to create a new UDP or TCP face.
+
+<faceId>
+ A numerical identifier of the face.
+ It is displayed in the output of **nfdc face list** and **nfdc create** commands.
+
+SEE ALSO
+--------
+nfd(1), nfdc(1)