BGP Community Filtering

Speed-IX route server peers are able to manipulate outbound routing policies via an in-band mechanism using BGP communities.

Currently, we offer the following options:

• Do not announce a prefix to a certain peer: 0:peer-as
• Announce a prefix to a certain peer: 41441:peer-as
• Do not announce a prefix to any peer: 0:41441

For destination peers employing a 32-bit ASN, you can use the large BGP community as follows:

• do not announce a prefix to a certain peer: 41441:0:peer-as
• announce a prefix to a certain peer: 41441:1:peer-as
• do not announce a prefix to any peer: 41441:0:0

For destination peers employing a 32-bit ASN, you also can use the route target extended BGP community as follows:

• do not announce a prefix to a certain peer: RT:0:peer-as
• announce a prefix to a certain peer: RT:41441:peer-as
• do not announce a prefix to any peer: RT:41441:0

AS path prepending

Speed-IX route server peers are able to add one or more AS numbers to the left side of the AS path and advertise it only to a certain member(s) by using below large BGP communities:

• prepend with one AS number to a certain peer: 41441:101:peer-as
• prepend with two AS numbers to a certain peer: 41441:102:peer-as
• prepend with three AS numbers to a certain peer: 41441:103:peer-as