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I have cacti graph the amount of prefixes announced and withdrawn from a BGP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.
+1
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:m...@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"[1] 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?
[1] Varying levels of completeless apply.
wfms
