On 3 sep 2008, at 1:45, Kai Chen wrote:
Just want to ask a direct question. Will an AS export all it gets from
its customers and itself to its providers? Or even under valley-free,
the BGP export policy is also selective?
I get the valley-free but not the selective. :-)
Iljitsch
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Le 08-09-03 à 11:08, Iljitsch van Beijnum a écrit :
On 3 sep 2008, at 1:45, Kai Chen wrote:
Just want to ask a direct question. Will an AS export all it gets
from
its customers and itself to its providers? Or even under valley-free,
the BGP
I think that yes, the valley-free property is a necessary but not
sufficient criteria for generating the set of in-reality-valid paths
on the Internet.
i assure you that the actual topology is not valley free. e.g. there
are many backup or political hack transit paths [0] between otherwise
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On 08-09-03 at 11:40, Randy Bush on holiday and should not be
reading nanog, let alone responding wrote :
i assure you that the actual topology is not valley free. e.g. there
are many backup or political hack transit paths
On 3 sep 2008, at 11:40, Randy Bush wrote:
I think that yes, the valley-free property is a necessary but not
sufficient criteria for generating the set of in-reality-valid paths
on the Internet.
i assure you that the actual topology is not valley free. e.g. there
are many backup or
On Wed, Sep 3, 2008 at 4:29 AM, William Waites [EMAIL PROTECTED] wrote:
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Le 08-09-03 à 11:08, Iljitsch van Beijnum a écrit :
On 3 sep 2008, at 1:45, Kai Chen wrote:
Just want to ask a direct question. Will an AS export all it gets from
its
On Wed, 03 Sep 2008 10:36:52 +0200, William Waites said:
Valley-free is a property of AS mesh models that says that, where edges
are classified as peering (p2p) or transit (c2p) that a valid path
contains zero or one peering link and that the peering link occurs
adjacent to the top of the
i assure you that the actual topology is not valley free. e.g. there
are many backup or political hack transit paths [0]
Sorry to further impinge on your vacation, but was there a footnote there?
apologies. one publicly known (because someone used traceroute) example
is mentioned in
On Wed, 03 Sep 2008 19:42:34 +0200, William Waites said:
Cases of partial transit, where B might repeat C's routes to peers but not
to upstrem providers are not, AFAIK treated in the model.
Ahh... that's the part I was missing. Thanks... (All the scenarios I though
of were basically different
On 3 sep 2008, at 23:08, [EMAIL PROTECTED] wrote:
Cases of partial transit, where B might repeat C's routes to peers
but not
to upstrem providers are not, AFAIK treated in the model.
Ahh... that's the part I was missing. Thanks... (All the scenarios
I though
of were basically different
Kai,
That's correct. A network purchasing transit will advertise its
internally-originated prefixes, as well as those it's learning from
downstream customers, to its provider.
(At least that's the theory. It's not terribly uncommon for transit
purchasers to advertise a full table, or for their
On Tue, Sep 2, 2008 at 4:45 PM, Kai Chen [EMAIL PROTECTED] wrote:
Just want to ask a direct question. Will an AS export all it gets from
its customers and itself to its providers? Or even under valley-free,
the BGP export policy is also selective?
that's the idea. but your use of valley-free
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