Hi Andrej, VPP does not run IPv6 neighbour unreachability detection (NUD) so, in the absence of an interface down signal, VPP will not be aware that the endpoint is no longer reachable.
/neale From: <[email protected]> on behalf of Andrej Mak <[email protected]> Date: Thursday, 13 July 2017 at 14:00 To: "[email protected]" <[email protected]> Subject: [vpp-dev] Neighbor unreachability detection in vpp 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
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