MLPE BGP communities
MLPE route servers support the ability for participants to more granularly control outbound announcements of their
routes using BGP communities.
The base actions are to allow or deny all routes, with exceptions for both, and to allow the prepending of your ASN up to three times.
There is no requirement to use BGP communities in conjunction with the MLPE service, however they are commonly used by large peers to avoid taking traffic from other large peers over the MLPE.
|Default Open (Announce to All)||24115:24115|
|Default Open Except AS12345||24115:24115 0:12345|
|Default Closed (Announce to None)||0:24115|
|Default Closed Except AS12345||0:24115 24115:12345|
|Include AS24115 in BGP
Path to all participants
|Prepend 1x to AS12345||65501:12345|
|Prepend 2x to AS12345||65502:12345|
|Prepend 3x to AS12345||65503:12345|
32 bits ASN
The use of 4-byte ASNs with the BGP community attribute has a risk of collision due to the truncation from 4-byte to 2-byte.