Hi,
one of my goals is to track traffic flowing through a particular AS-
path. For traffic flowing to destinations behind that path (outbound
for us) this is easy to do by matching the AS-path that we get from
BGP RIB lookups. However, for traffic flowing from sources behind that
path (inbound for us), how would one go about doing just that?
This is quite similar in concept to the mechanics of calculating the
source peer AS: an RPF lookup would be required again, which should
return the AS-path instead of the next-hop. Of course once again we
have the assumption that routing is symmetric, which however in
internet environments is far from the truth, but it's still better
than nothing. How difficult would it be to implement this so that we
could have a src_as_path aggregation primitive?
Best regards,
Z.
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