Large BGP Communities playground

Lately, in the IETF Inter-Domain Routing (idr) area, various efforts are going on to push a (IMHO) winning idea to solve a 32-bits-wide problem: standard BGP communities are no longer enough to describe routing policies which involve 4-byte ASNs. For example, how can I tell my transit provider to not announce my prefixes to AS65551 (a 4-byte ASN) using a schema like 65500:nnn do not announce to peer nnn? Well, draft-heitz-idr-large-community proposes a simple and quick solution to this problem: Large BGP Communities ( for more info).

Many vendors seem to like the idea, some of them have already published a working implementation, others plan to work on it in the (hopefully) near future.

In order to test current implementations and see them with my own eyes I wanted to build a Large BGP community playground, just a way to have the new code up & running quickly. Hopefully I will keep it up to date as soon as more vendors release their code.


# gobgp neighbor adj-in
Network Next Hop AS_PATH Age Attrs 65536 00:14:49 [{Origin: i} {LargeCommunity: [ 65536:1:2]}]


Thu, 15 Sep 2016 14:15:18 5 routes peer ASN 65537 << UPDATE (1) ( 4) attributes origin incomplete as-path [ 65537 ] large-community 65537:3:4

It’s on GitHub: comments or suggestions would be greatly appreciated.

The following two tabs change content below.
Italian, born in 1980, I started working in the IT area in the late '90s; I'm now a system and network administrator with a deep knowledge of the global Internet and its core architectures.

Leave a Reply