Destination Preference Attribute for BGP
Mark Tinka
mark at tinka.africa
Fri Aug 18 21:20:41 UTC 2023
On 8/18/23 09:38, Robert Raszuk wrote:
> Jakob,
>
> With AS-PATH prepend you have no control on the choice of which ASN
> should do what action on your advertisements.
My comprehension of DPA would have been more directed than the "spray &
pray" approach AS_PATH prepending provides.
> However, the practice of publishing communities by (some) ASNs along
> with their remote actions could be treated as an alternative to the
> DPA attribute. It could result in remote PREPEND action too.
>
> If only those communities would not be deleted by some transit
> networks ....
Even then, communities have best efficacy at the closest interconnect
with the network that is using them. Since community values are
generally not coordinated Internet-wide, it would take a laborious
effort to construct the right set of communities to achieve the desired
outcome for an end-to-end source or destination path, assuming those
communities were not mangled in flight.
Mark.
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