Babel in Bird 1.6.0

[Juliusz Chroboczek]

> Also now it seems to me that even the current code is not valid as it
> implicitly assumes that the prefix length is 128 with this flag.
> As the spec says 'low-order 8 octets of the advertised prefix' then
> if one advertise 2001:DB8:1020:3040:5060:7080::/96, then low-order
> 8 octets of this *prefix* are 1020:3040:5060:7080 and not
> 5060:7080:0000:0000.

Right.  The spec is imprecise here -- what is meant is the address
advertised within the update TLV, after compression.  So a router can
advertise

  2001:db8:1020:3040:5060:7080:dead:beef/96

which advertises 2001:db8:1020:3040:5060:7080::/96 and sets the router-id
to 50:60:70:80:de:ad:be:ef.
  
> It seems that when used outside of the scope of obvious application (full
> IPv6 address), this flag is not really well specified (and does not make
> much sense).

Agreed, compression is underspecified in quite a few ways.  Mea culpa.

-- Juliusz