[c-nsp] Monitoring some minimal prefix count from specific eBGP neighbor

[Andris Zarins]

Hi,

 

I'm tryin to figure out a way how to monitore if some specific eBGP
neighbor is announcing some minimal prefix count.

 

Generally - task is pretty obvious - we have several (3) upstream
providers, and we run a full-BGP with each of them. For several times we
have run into situation, when some of those peers, who should advertise
us fullBGP, advertise only some small subset of prefixes
(misconfiguration at upstream side etc), so even if eBGP session stays
UP, we are receiving some or maybe even none prefixes, so in reality -
no traffic is passing that way and we could say that peer is dead. 

 

If task would be to monitor if prefix count is not exceeded (maximum) -
everything would be simple, configure max-prefix-count for some peer,
and if its exceeded - SNMP trap is generated and we can monitor that.
Same way we can monitor if some BGP peers lay down, there are also SNMP
traps in that case. But I can't think of a way how to monitor if
neighbor is advertising, for example, some 10000 prefixes (if number is
less than 10k - this should be considered as violation of some kind and
we should get some trap or something like that). 

 

Any ideas or solutions would be greatly appreciated :-)

 

Andris