algorithm used by (RIPE region) ISPs to generate automatic BGP prefix filters

Martin T m4rtntns at
Thu Feb 4 11:14:36 UTC 2016


am I correct that ISPs (in RIPE region), who update their BGP prefix
filters automatically, ask their IP transit customer or peering
partner to provide their "route"/"route6" object(s) or "as-set" object
in order to find all the prefixes which they should accept? If the IP
transit customer or peering partner provides an "as-set", then ISP
needs to ensure that this "as-set" belongs to this IP transit customer
or peering partner because there is no automatic authentication for
this, i.e. anybody can create an "as-set" object to database with
random "members" attributes? This is opposite to "route"/"route6"
objects which follow a strict authentication scheme. In addition, in
case of "as-set", an ISP needs to recursively find all the AS numbers
from "members" attributes because "as-set" can include other
"as-sets"? Quite a lot of question, but I would simply like to be sure
that I understand this correctly.


More information about the NANOG mailing list