On 17/Mar/15 11:59, David Wilkinson wrote:
I assume I would have make sure those communities are removed from the upstream and downstream announcements like I would for private ASNs?
Even though BGP communities are transitive, they are generally harmless since each AS has its own routing policy. Some networks strip foreign BGP communities, others allow them through transparently.
However, if every new ISP is obtaining 32-bit ASN's, it stands to reason that without any kind of global co-ordination, BGP communities based on private ASN's have a remote (but likely) chance of clashing between disparate AS's.
Mark.
