On 17/03/15 12:43, Mark Tinka wrote:
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.
Then we prolong the problem until we run out of private ASNs to use.
Making communities 64-bit instead of 32-bit would solve the issue,
making it backwards compatible is going to be hard.
