Internet routing table "completeness" monitoring?

Joseph Jackson jjackson at aninetworks.net
Wed Oct 3 14:01:15 UTC 2012


Not sure I don't have any non-cisco BGP routers.  Sorry!



-----Original Message-----
From: Neil Robst [mailto:neil.robst at kit-digital.com] 
Sent: Wednesday, October 03, 2012 8:54 AM
To: Joseph Jackson; ml at kenweb.org; North American Networking and Offtopic Gripes List
Subject: RE: Internet routing table "completeness" monitoring?

This is still only possible on Cisco routers, isn't it - Foundry/Brocade gear doesn't currently include an SNMP OID for this info, does it?

-----Original Message-----
From: Joseph Jackson [mailto:jjackson at aninetworks.net] 
Sent: 03 October 2012 14:51
To: ml at kenweb.org; North American Networking and Offtopic Gripes List
Subject: RE: Internet routing table "completeness" monitoring?

I have cacti graph the amount of prefixes announced and withdrawn from a BGP peer on each BGP router.



-----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"[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.





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