3. Reply(P)   2. Reply(P)   1. Reply(P)
         +----+        +----+        +----+
         |    |        |    |        |    |
         v    |        v    |        v    |
+--------+    +--------+    +--------+    +--------+    +---------+
| CCNinfo|----| Router |----| Router |----| Router |----|Publisher|
|  user  |    |   A    |    |   B    |    |   C    |    |         |
+--------+    +--------+    +--------+    +--------+    +---------+
                                     ^
                                      \          +-------+
                           1. Reply(C) \         | Cache |
                                        \ +---------+    |
                                         \| Caching |----+
                                          |  router |
                                          +---------+