RG              UP                       CP             AAA
     |      RS       |                        |               |
    1|-------------->|                        |               |
     |               |  Relay the Router      |               |
     |               |    Solicit (RS)        |               |
     |              2|-----to CP via Si------>|      AAA      |
     |               |                        |    Req/Rep    |
     |               |                       3|<------------->|
     |               |  Create Subscriber     |               |
     |               |   Session Request      |               |
     |              4|<--------via Ci---------|               |
     |               |                        |               |
     |               |  Create Subscriber     |               |
     |               |   Session Response     |               |
     |              5|---------via Ci-------->|               |
     |               |                        |               |
     |               |  Send Router Advertise |               |
     |               |         (RA)           |               |
     |              6|<----to UP via Si-------|               |
     |      RA       |                        |               |
    7|<--------------|                        |               |
     |               |                        |               |
     |      NS       |                        |               |
    8|-------------->|                        |               |
     |               |  Relay the Neighbor    |               |
     |               |     Solicit (NS)       |               |
     |              9|-----to CP via Si------>|               |
     |               |                        |   Accounting  |
     |               |                      10|<------------->|
     |               |  Send a Neighbor       |               |
     |               |     Advertise (NA)     |               |
     |             11|<----to UP via Si-------|               |
     |      NA       |                        |               |
   12|<--------------|                        |               |
     |               |                        |               |