Damien,
That is completely incorrect. BGP keeps (and may use locally) as
many paths as it receives from it's iBGP and eBGP peers.
well, with vanilla BGP, at one given router you have only one exit
per prefix.
No. EBGP multipath and IBGP multipath are clear examples where in
vanilla BGP you install more then one BGP path to RIB.
In the paper, we consider vanilla BGP, of course multipath BGP allows
several exits per prefix, and you can use add path to iBGPed announce
multiple routes internally
I am talking about vanilla BGP. No add-path is required for multipath.
Please note that there are commercial deployed products doing just
that for the last 10 years or so already.
sure, but as far as I know, they are black boxes and there is no
standard method for them. is there?
They are not that black. They in fact work by influencing BGP best path
decision.
Also multipath considers link-bw which results in non equal traffic
spread.
you are right that the phrasing was not ideal. It is obviously
possible to have no equal traffic spread when combined with TE, but
it is not BGP itself that allow this.
Of course this is BGP itself. Nothing to do with TE. Please see:
http://tools.ietf.org/html/draft-ietf-idr-link-bandwidth-04
The tunneling to deflection point in the upstream can be done, but
it guarantees nothing. Till you have at least a minimal assurance
what is the view of the world of the peers of the upstream any
decision you make from stub AS point of view will be quite blind.
Sorry, I am not sure I understand this sentence. With the tunnels, we
can select the exit point exactly, however, of course, the selection
of this exit point is based on partial information.
You select it exactly but only in your peer. The point is that it buys
you very little as avrage AS distance today is 3.4 - You have completely
no control what happens after the deflection point.
Assuming that LMDs are just a bit extended RRs normal EBGP with
add-paths could be used. I see no need for new protocol.
I thought add path was limited to iBGP. If we can use add-path in
eBGP and if we can use any selection mode we want, then yes it would
make it.
Today it is limited to iBGP, but not that it can not be extended if you
provide valid case for it.
Thx,
R.
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