How does AAPT use BGP communities?
AAPT uses BGP communities to control routing announcements, i.e. the routes we send to customers as well as the routes we send to our peers and providers. These communities are divided into two groups: public communities these can be set by customers to influence how AAPT treats a route, either internally or externally. private communities are used to classify routes. Customers should not try setting these communities as we will clear all customer set communities if a private community is present in a routing announcement. Public communities These communities allow customers to modify AAPT’s routing system behaviour in some way. The current communities are: 2764:4 Modify the local preference of a route so that it is lower than a route received from a peer but not lower than a transit provider. 2764:5 Modify the local preference of a route so that it is lower than a route received from a normal customer announcement but not lower than one received from a peer.
