On 4/10/2017 1:15 PM, Faisal Imtiaz wrote:
hint... not sure who are your ISP's but in some cases, you can use bgp communities for their upstream (as long as they do not filter or overwrite the communities) to have the desired affect.
Unfortunately that isn't an option, because of the topology. The issue is that a significant amount of the traffic comes from a source directly connected to an intermediary network, before it reaches Tier 1 Internet; and that intermediary network is the one that is declining to offer support for BGP communities.

It's the same reason that path pre-pending isn't working well either.

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