🚀 go-pugleaf

A question on BGP announces.
On a WORLD EBGP4 router, I will see the followning announcements.

CARRIER1 = AS4
CARRIER1 announce 192.168.0.0/16 path 1 2 3 4
CARRIER1 announce 192.168.100.0/24 path 1 2 3 4 5

CARRIER2 = AS6
CARRIER2 announce 192.168.100.0/24 path 11 2 8 6 5

CARRIER3 = AS7
CARRIER3 announce 192.168.100.0/24 path 12 10 7 5

The first /16 announce, given by CARRIER1, contains the more specific
one given by CARRIER1,2,3.
Which announce will other BGP routers consider? I think it's the most
specific announce, so everyone will get the /24 announce with 3
different paths, EVEN if the /16 announce contains that network, and its
path is shorter than other ones.
If AS5 link to CARRIER1 is down, WORLD will consider announces given by
CARRIER2,3.
The first announce (192.168.0.0/16) will be considered ONLY if all
CARRIERS withdraw /24 announces.

Is it a fair explanation? Or, excluding all those BGP routers which do
not accept small announcement, there may be situations in which the /16
announcement is taken as the best path one?

Thanks in advance.

-- 
Marco Meinardi

<marcom@inrete.it>
MM7443-RIPE
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