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RFC 4632, "Classless Inter-domain Routing (CIDR): The Internet Address Assignment and Aggregation Plan", August 2006

Source of RFC: grow (ops)

Errata ID: 1824
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT

Reported By: Dande Rajasekhar
Date Reported: 2009-08-05
Held for Document Update by: Ron Bonica

Section 6.1 says:

To make this example more realistic, assume that C4 and C5 are multi-
   homed through some other service provider, "PB".  Further assume the
   existence of a site, "C7", that was originally connected to "RB" but
   that has moved to "PA".  For this reason, it has a block of network
   numbers that are assigned out PB's block of (the next) 2048 x /24.

   o  C7.  Assign 10.32.0 through 10.32.15.  This block is described by
      the route 10.32.0.0/20 (mask 255.255.240.0).

For the multi-homed sites, assume that C4 is advertised as primary
   via "RA" and secondary via "RB"; and that C5 is primary via "RB" and
   secondary via "RA".  In addition, assume that "RA" and "RB" are both
   connected to the same transit service provider, "BB".

   Graphically, this topology looks something like this:

   10.24.0.0 -- 10.24.7.0__         __10.32.0.0 - 10.32.15.0
   C1: 10.24.0.0/21        \       /  C7: 10.32.0.0/20
                            \     /
                             +----+                              +----+
   10.24.16.0 - 10.24.31.0_  |    |                              |    |
   C2: 10.24.16.0/20       \ |    |  _10.24.12.0 - 10.24.15.0__  |    |
                            \|    | / C4: 10.24.12.0/20        \ |    |
                             |    |/                            \|    |
   10.24.8.0 - 10.24.11.0___/| PA |\                             | PB |
   C3: 10.24.8.0/22          |    | \__10.24.32.0 - 10.24.33.0___|    |
                             |    |    C5: 10.24.32.0/23         |    |
                             |    |                              |    |
   10.24.34.0 - 10.24.35.0__/|    |                              |    |
   C6: 10.24.34.0/23         |    |                              |    |
                             +----+                              +----+
                               ||                                  ||
   routing advertisements:     ||                                  ||
                               ||                                  ||
           10.24.12.0/22 (C4)  ||              10.24.12.0/22 (C4)  ||
           10.32.0.0/20 (C7)   ||              10.24.32.0/23 (C5)  ||
           10.24.0.0/13 (PA)   ||              10.32.0.0/13 (PB)   ||
                               ||                                  ||
                               VV                                  VV
                            +---------- BACKBONE NETWORK BB ----------+

It should say:

To make this example more realistic, assume that C4 and C5 are multi-
   homed through some other service provider, "PB".  Further assume the
   existence of a site, "C7", that was originally connected to "PB" but
   that has moved to "PA".  For this reason, it has a block of network
   numbers that are assigned out PB's block of (the next) 2048 x /24.

   o  C7.  Assign 10.32.0 through 10.32.15.  This block is described by
      the route 10.32.0.0/20 (mask 255.255.240.0).

For the multi-homed sites, assume that C4 is advertised as primary
   via "PA" and secondary via "PB"; and that C5 is primary via "PB" and
   secondary via "PA".  In addition, assume that "PA" and "PB" are both
   connected to the same transit service provider, "BB".

   Graphically, this topology looks something like this:

   10.24.0.0 -- 10.24.7.0__         __10.32.0.0 - 10.32.15.0
   C1: 10.24.0.0/21        \       /  C7: 10.32.0.0/20
                            \     /
                             +----+                              +----+
   10.24.16.0 - 10.24.31.0_  |    |                              |    |
   C2: 10.24.16.0/20       \ |    |  _10.24.12.0 - 10.24.15.0__  |    |
                            \|    | / C4: 10.24.12.0/20        \ |    |
                             |    |/                            \|    |
   10.24.8.0 - 10.24.11.0___/| PA |\                             | PB |
   C3: 10.24.8.0/22          |    | \__10.24.32.0 - 10.24.33.0___|    |
                             |    |    C5: 10.24.32.0/23         |    |
                             |    |                              |    |
   10.24.34.0 - 10.24.35.0__/|    |                              |    |
   C6: 10.24.34.0/23         |    |                              |    |
                             +----+                              +----+
                               ||                                  ||
   routing advertisements:     ||                                  ||
                               ||                                  ||
           10.24.12.0/22 (C4)  ||              10.24.12.0/22 (C4)  ||
           10.32.0.0/20 (C7)   ||              10.24.32.0/23 (C5)  ||
           10.24.0.0/13 (PA)   ||              10.32.0.0/13 (PB)   ||
                               ||                                  ||
                               VV                                  VV
                            +---------- BACKBONE NETWORK BB ----------+

Notes:

All the reference of "RA" and "RB" to be replaced with "PA" and "PB".

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