I've done some more digging and I believe it is an issue that AS path
updates are added added to the RIB rather than replacing the current
entry in the RIB. When I dump the RIB from one neighbor:
> $ bgpctl show rib neighbor $ciscoip > cisco
Then count the entries with and without duplicate prefixes I get
different prefix counts:
> $ cat cisco | wc -l
> 212066
> $ cat cisco | sort -u -k2 | wc -l
> 179908
Any insight would be appreciated.
Thanks,
Dustin Lundquist
Dustin Lundquist wrote:
> We have a rather mysterious issue with our OpenBGPD box. We use it to
> inject a bogon BGP feed and as a router monitor. We recently upgrade
> from 3.6 to 4.0 and bgpd keeps closing the session because max-prefix
> has been reached. I configured MRTG to generate graphs of prefixes on
> each of our BGP session and can see the prefix count slowly growing from
> about 160000 to 250000 over an 18 hour period. The Cisco router in
> question would hit hardware limitations before it could announce 250k
> prefixes, so I'm wondering if this could be an incompatibility or bug.
> The same configuration was working under 3.6.
>
> Cisco config except:
> neighbor --openbsdbox-- remote-as --ourasn--
> neighbor --openbsdbox-- description iBGP with OpenBGPD
> neighbor --openbsdbox-- password 7 --md5 password removed--
> neighbor --openbsdbox-- version 4
> neighbor --openbsdbox-- next-hop-self
> neighbor --openbsdbox-- route-map bogons in
> neighbor --openbsdbox-- maximum-prefix 1000 70
>
> /etc/bgpd.conf except:
> group "iBGP" {
> remote-as --ourasn--
> announce all
> max-prefix 250000 restart 5
> multihop 3
>
> neighbor --cisco-- {
> descr "iBGP with cisco"
> tcp md5sig password --md5 password removed--
> }
> neighbor --anothercisco-- {
> descr "iBGP with anothercisco"
> tcp md5sig password --md5 password removed--
> }
> }
