Internet routing table "completeness" monitoring?
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> I have cacti graph the amount of prefixes announced and withdrawn from a BGP peer on each BGP router.
Note that not all router OSs support fetching data like that via SNMP.
needed on a particularly troublesome peer.
> Subject: Internet routing table "completeness" monitoring?
> Has anyone put in place a method to identify if one their BGP peers suddenly withdraws X% of their prefixes?
> e.g I should expect ~420k prefixes in a "complete" routing table from a transit peer today.  If suddenly I'm only getting 390k prefixes I'd guess a major network was depeered or similiar.
> If so how are people doing this? SNMP MIB, screen scrape?
>  Varying levels of completeless apply.