Thu, Apr 28, 2016 at 12:47:45PM +0000, Laszlo Hanyecz wrote:
> Once you eliminate the ~160k superfluous prefixes (last time I
> checked)... This is a none issue.
> Some work on some sort summary function would keep those devices
> alive... but we all know there is more money to be made the faster the
> device become obsolete
Can you explain how this works? How can a router determine which prefix
is superfluous? How does it cope when a suppressed prefix is withdrawn
or a more specific prefix is added? Is this just one of those 'it works
some of the time' solutions or is this something that can be done safely
with an appropriate algorithm?
A fair chunk of the routing table is aggregable. If multiple
aggregable prefixes share the same nexthop, the HW entries can be
summarised accordingly, reducing the HW resource footprint.
Should one of the smaller prefixes be withdrawn or best path
change to another nexthop, the control plane needs to be smart
enough to adapt and reprogram the HW accordingly. It is a fairly
logical and reasonable algorithm to construct