Hello, Everyone! Many SFP agreements include terms that the peering link will not be used as an upstream with static defaults. A few examples are provided below. *h. must agree not to abuse the peering relationship by engaging in activities such as but not limited to: pointing a default route at the other or otherwise forwarding traffic for destinations not explicitly advertised, resetting next-hop, selling or giving next-hop to others;* Source: http://www.level3.com/en/legal/ip-traffic-exchange-policy/ *2.6. Neither Network shall point default into or transit the other Network where that network has* *not advertised a route for the destination in question.* Source: http://www.zayo.com/wp-content/uploads/2017/02/ZayoPeeringPolicy.pdf How is this monitored and tracked? Are ACLs applied to help enforce this (seems to be limited at scale)? Flow export and alarming? Analytics and anomalous behavior detection? Common professional courtesy? Thanks so much for any insight you may have. I'd like to ensure I'm following all best practices when in IX and peer situations. -Raymond Beaudoin