On 26/10/11 13:28, Gert Doering wrote:
This is a FAQ... BGP only forward-announces the best prefix it knows.
So if you have:
ExtA - Ra - Rb - Extb
and "Ra" thinks that 150k prefixes are "best via Rb/ExtB", then it will only
announce the rest (190k via ExtA) to Rb.
Prefixes preferred over Rb will never be announced back to Rb, and since
BGP will only ever announce the*best* path, you'll see less-than-full
tables on Rb.
Thanks, that make sense. I'm just having some routing issues with some
ASes after installing second border. And though maybe this is related.
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