Re: Request for Comments on a topological address block for N. Calif.

[Sean Doran <smd () cesium clock org>]

The issue Andrew and Tony were raising was a bit more simple
and a bit more complicated on several fronts.  Let's start
with a picture:

        MAE-WEST        PBNAP                   MAE-EAST

        39.0/10         39.64/10                39.128/10

   A------|             S----|                  A--|
   S------|             M----|                  S--|
   M------|             N9---|                  M--|
   N9-----|             NE---|                  N9-|
   NE-----|             Y----|                  NE-|
   X------|                                     Z--|

In normal conditions:

        How does X get traffic to Y?
        How does Y get traffic to X?
        How does X get traffic to Z?
        How does Z get traffic to X?
        How does Y get traffic to Z?    
        How does Z get traffic to Y?

        How does A get traffic to Y?
        How does Y get traffic to A?

        Where can 39.0/9 be aggregated?
        Where can 39/8 be aggregated?

        What are the side-effects of both these aggregations
        when things are operating normally?

In failure conditions:

        If S falls off MAE-WEST, how does it get traffic
        to the customers of A, M, N9, NE and X that are 
        addressed by 39.0/10?

        How do A, M, N9, NE, and X get to S's customers
        that are addressed by 39.0/10?

        If A falls off MAE-WEST, how does it get traffic
        to the customers of A, M, N9, NE, and X
        that are in 39.0/10?  How does it get to all of 39.0/9?

        How does the rest of the world get to A's customers
        that are addressed in 39.0/10?

        What happens in both these cases to traffic between Z
        and everything in 39.0/9, in each direction?

These definitely are not hypothetical questions.

If geographical or stratum-based allocation that is not
_also_ provider-based is to fly, this is precisely the type
of thing that must be dealt with.

        Sean.