[6bone] 2001:478:: as /48

[Stephen Stuart]

> Provided if every ISP uses "next-hop-self" to their I-BGP peering, the
> addresses on an IX is used only for E-BGP peering. What we loose if
> nobody advertises the IX prefix globally (or even locally)?

We lose:

- In combination with RPF checking, we would lose the ability to see a
  traceroute through an exchange point (assuming that the ICMP
  feedback was sourced using the IX-connected address).

- The ability to ping the near and far sides of an exchange point
  boundary from a distance; this is sometimes useful for determining
  the character of asymmetric routing (when the RTTs for near and far
  side vary greatly).

I would prefer to keep these as diagnostic tools.

Stephen