Can you check the actual FIB usage? With 2m IPv4 divided into v4 and v6 * Fast ReRoute could hit the limit.
Baldur Norddahl <baldur.nordd...@gmail.com> schrieb am Mi., 15. Mai 2019, 20:24: > Hello > > On Wed, May 15, 2019 at 3:56 PM Mike Hammett <na...@ics-il.net> wrote: > >> What is the most common platform people are using with such limitations? >> How long ago was it deprecated? >> >> >> > We are a small network with approx 10k customers and two core routers. The > routers are advertised as 2 million FIB and 10 million RIB. > > This morning at about 2 AM CET our iBGP session between the two core > routers started flapping every 5 minutes. This is how long it takes to > exchange the full table between the routers. The eBGP sessions to our > transits were stable and never went down. > > The iBGP session is a MPLS multiprotocol BGP session that exhanges IPv4, > IPv6 and VRF in a single session. > > We are working closely together with another ISP that have the same > routers. His network went down as well. > > Nothing would help until I culled the majority of the IPv6 routes by > installing a default IPv6 route together with a filter, that drops every > IPv6 route received on our transits. After that I could not make any more > experimentation. Need to have a maintenance window during the night. > > These routers have shared IPv4 and IPv6 memory space. My theory is that > the combined prefix numbers is causing the problem. But it could also be > some IPv6 prefix first seen this night, that triggers a bug. Or something > else. > > Regards, > > Baldur > > >
