No. EBGP multipath and IBGP multipath are clear examples where in vanilla BGP 
you install more then one BGP path to RIB.


in which RFC is this defined? I looked for but not found it. I am not looking
for multiple routes in the RIB but in the FIB. If you can point me to the
correct RFC, I am interested.

http://tools.ietf.org/html/draft-ietf-idr-bgp-issues-06
Section 2.11.3

It does not require protocol extension so this is a BGP implementation thing. IETF RFCs are not to describe implementations, but protocol.

And of course multipaths are installed both in RIB and FIB.

Of course this is BGP itself. Nothing to do with TE. Please see:
http://tools.ietf.org/html/draft-ietf-idr-link-bandwidth-04

Well, I had the impression that this extended community was used
to announce the link capacity more than its usage.

True.

Do you know if someone is using this community to adapt the load
> balancing according to the link load?

I do not know if this would be a good idea in the first place.

R.
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