[ixpmanager] How is Peering policy handled in the backend?

[Nick Hilliard (INEX)]

Haider Ali wrote on 03/08/2019 12:06:
> How is selective peering being handled at the backend?

It isn't.  The participants at the IXP determine how they want their 
prefixes to be exchanged.

If they have bilateral BGP sessions, then this is entirely a matter for 
them, and the IXP has no way of interfering with this.  If they choose 
to use the route servers, then:

outgoing prefixes: they can use the standard community tags if they want 
their prefixes to be sent or blocked for other RS clients.

incoming prefixes: they can use standard BGP as path filters or prefix 
lists to filter out what they don't want to see.

The IXP doesn't control any of this.  The control is solely in the hands 
of the IXP participants because they are better at deciding what's most 
appropriate for their routing policy.

Nick