Receive/export route limit behaviour?

[Ondrej Zajicek]

On Tue, Apr 03, 2018 at 10:52:14PM +0200, Guillaume LUCAS wrote:
> Hellow,
> 
> On my BIRD router, I have two IPv4 BGP upstream neighbors. From them, my
> router receive 678,000 and 681,000 routes. On these BGP sessions, I have
> configured "receive limit 700000 action block".
> 
> On this same router, I have one IPv4 BGP downstream neighbor. On this
> one, I have configured "export where proto = "static_allocations" ||
> proto = "bgp_upstream1" || proto = "bgp_upstream2";" and "export limit
> 700000 action disable". "static_allocations" always contains only one route.
> 
> BIRD frequently disables downstream neighbor's BGP session because the
> export limit has been exceeded. I can understand this behaviour:
> upstream1 may distribute routes that upstream2 does not have, but I see
> the same behavior with "export limit 750000 action disable". However, my
> upstreams do not provide me more than 50,000 different routes:
> 
>   # birdc sh route protocol bgp_upstream1 | grep -Po "[0-9./]+(?=[
> ]+via)" | sort -n > bgp_upstream1
>   # birdc sh route protocol bgp_upstream2 | grep -Po "[0-9./]+(?=[
> ]+via)" | sort -n > bgp_upstream2
>   # diff -b -w -y --suppress-common-lines bgp_upstream1 bgp_upstream2 |
> wc -l
>   3503
> 
> How is it possible to export more routes than I receive?

Hi

What do you see in 'show protocols all' in import/export statistics?
Do they make sense?

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."