Yes, it is between routers. BFD seems promising. Ole, Neale, thanks. Andrej
-----Original Message----- From: Ole Troan [mailto:[email protected]] Sent: Sunday, July 16, 2017 5:45 PM To: Andrej Mak <[email protected]> Cc: [email protected] Subject: Re: [vpp-dev] Neighbor unreachability detection in vpp Andrej, What use case do you have in mind for NUD? NUD is typically more useful in the host -> router direction, in case there are multiple routers on the link. If this is between two routers, BFD offers a much quicker and lower overhead detection option. Best regards, Ole > On 13 Jul 2017, at 15:00, Andrej Mak <[email protected]> wrote: > > Hi, > > I would need help with vpp IPv6 neighbor unreachability detection in vpp. > I have a running vpp instance. Vpp has an interface with ip 2001::3, which is > connected to linux network interface with ip 2001::5. > When I ping 2001::5 from vpp, neighbor solicitation and advertisement runs > and I can see a record in neighbor table. > vpp# show ip6 neighbors > Time Address Flags Link layer > Interface > 23973.4355 2001::5 D 08:00:27:ba:84:9e > GigabitEthernet0/9/0 > > Then I down linux interface 2001::5. When I try ping 2001::5 in vpp, no reply > is received, but neighbor entry is still present in the table when I run show > ip6 neighbors. > > When I try it other way round (down vpp's 2001::3 interface, ping6 2001:3 > from linux) ping receive no reply and neighbor entry is marked as FAILED. > $ip -6 neigh > 2001::3 dev eth2 FAILED > > Is there some way how to get such unreachability info also from vpp? > > Thanks for help > Andrej > > Andrej Mak > Software Developer > > PANTHEON technologies s.r.o. > Janka Kráľa 9, 974 01 Banská Bystrica > Slovakia > Tel / +421 220 665 111 > > MAIL / [email protected] > WEB / https://pantheon.tech > > > _______________________________________________ > vpp-dev mailing list > [email protected] > https://lists.fd.io/mailman/listinfo/vpp-dev Andrej Mak Software Developer PANTHEON technologies s.r.o. Janka Kráľa 9, 974 01 Banská Bystrica Slovakia Tel / +421 220 665 111 MAIL / [email protected] WEB / https://pantheon.tech _______________________________________________ vpp-dev mailing list [email protected] https://lists.fd.io/mailman/listinfo/vpp-dev
