To default or to not to default that is the problem ;)

Daniel Roesen dr at
Sat Jan 28 16:42:15 CET 2006

On Sat, Jan 28, 2006 at 12:45:45AM +0100, Jeroen Massar wrote:
> As an exercise for the readers, why would a "Tier X Transit" send on a
> default route it receives from another network ? :)

If it's a default route received from their upstream(s), it's a quite
sensible thing actually.

> Other question is of course why networks accept defaults in the first place.

If from upstream: why not? Doesn't hurt and can be used to provide a
more stable and sensible default route to downstream customers.
"default-originate" doesn't cover things like isolated aggregation
router, broken IGP etc. - a passed default route from the uplinks has
a much better chance to disappear if something is going wrong. :-)

Best regards,

CLUE-RIPE -- Jabber: dr at -- dr at IRCnet -- PGP: 0xA85C8AA0

More information about the ipv6-ops mailing list