Internet routing table "completeness" monitoring?
William F. Maton Sotomayor
wmaton at ottix.net
Wed Oct 3 14:16:48 UTC 2012
On Wed, 3 Oct 2012, Joseph Jackson wrote:
> I have cacti graph the amount of prefixes announced and withdrawn from a BGP peer on each BGP router.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.
We use a custom built thing internally that does this two, which we then
tack on an alert threshold for. So if a downstream peer sends us less
than that, we get an alert. Handy for those times when they call and ask
us what we did to their network. :-)
Prior to that, we had a script which whould login, munge the 'show ip bgp
summary' table output, figure out the deltas and graph or report as
needed on a particularly troublesome peer.
> -----Original Message-----
> From: ML [mailto:ml at kenweb.org]
> Sent: Tuesday, October 02, 2012 11:43 PM
> To: North American Networking and Offtopic Gripes List
> 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.
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