nlsr: discover Faces from NFD

refs: #2954

Change-Id: I072972d88bce0e1012e96f33577657048b7df1e1
diff --git a/nlsr.conf b/nlsr.conf
index 329a702..ef569ce 100644
--- a/nlsr.conf
+++ b/nlsr.conf
@@ -11,7 +11,7 @@
   ; lsa-refresh-time is the time in seconds, after which router will refresh its LSAs
   lsa-refresh-time 1800      ; default value 1800. Valid values 240-7200
 
-  ; router-dead-interval is the time in seconds after which an inactive router's
+  ; router-dead-interval is the time in seconds after which an inactive routers
   ; LSAs are removed
   ;router-dead-interval 3600 ; default value: 2*lsa-refresh-time. Value must be larger
                              ; than lsa-refresh-time
@@ -39,7 +39,7 @@
   ;log4cxx-conf /path/to/log4cxx-conf  ; path for log4cxx configuration file (Absolute path)
 }
 
-; the neighbors section contains the configuration for router's neighbors and hello's behavior
+; the neighbor's section contains the configuration for router's neighbors and hellos behavior
 
 neighbors
 {
@@ -65,6 +65,16 @@
 
   first-hello-interval  10   ; Default value 10. Valid values 0-10
 
+  face-dataset-fetch-tries 3 ; default is 3. Valid values 1-10. The FaceDataset is
+                             ; gotten from NFD, and is needed to configure NLSR
+                             ; correctly. It is recommended not to set this
+                             : variable too high, because it could cause
+                             ; congestion for NFD.
+
+  face-dataset-fetch-interval 3600 ; default is 3600. Valid values 1800-5400.
+                                   ; This controls how often (in seconds) NLSR will attempt to
+                                   ; fetch a FaceStatus dataset from NFD.
+
   ; neighbor command is used to configure router's neighbor. Each neighbor will need
   ; one block of neighbor command
 
@@ -105,7 +115,7 @@
 }
 
 
-; the fib section is used to configure fib entry's type to ndn FIB updated by NLSR
+; the fib section is used to configure fib entrys type to ndn FIB updated by NLSR
 
 fib
 {