bgpd: "Interface does not have a v6 LL address associated" observed in logs – looking for clarification

[poorniiima]

I am observing the following log repeatedly in bgpd:

Jan  5 21:19:30 route-views.fortaleza bgpd[32568]: [ZM2F8-MV4BJ][EC 33554509] Interface: em2.1988 does not have a v6 LL address associated with it, waiting until one is created for it
Jan  5 21:19:36 route-views.fortaleza bgpd[32568]: [ZM2F8-MV4BJ][EC 33554509] Interface: em2.1988 does not have a v6 LL address associated with it, waiting until one is created for it
Jan  5 21:21:30 route-views.fortaleza bgpd[32568]: [ZM2F8-MV4BJ][EC 33554509] Interface: em2.1988 does not have a v6 LL address associated with it, waiting until one is created for it
Jan  5 21:21:36 route-views.fortaleza bgpd[32568]: [ZM2F8-MV4BJ][EC 33554509] Interface: em2.1988 does not have a v6 LL address associated with it, waiting until one is created for it
Jan  5 21:23:30 route-views.fortaleza bgpd[32568]: [ZM2F8-MV4BJ][EC 33554509] Interface: em2.1988 does not have a v6 LL address associated with it, waiting until one is created for it
Jan  5 21:23:36 route-views.fortaleza bgpd[32568]: [ZM2F8-MV4BJ][EC 33554509] Interface: em2.1988 does not have a v6 LL address associated with it, waiting until one is created for it

Please find the complete logs here: https://archive.routeviews.org/bgpstatus/2023-01/05-routeviews-bgpd-status.txt

What I would like to understand:

1. Why does this issue occur?
   1.1 What could prevent an interface from automatically receiving a link-local address?
   1.2Is this likely a configuration issue, kernel/OS behaviour, or something specific to FRR?
2. Potential Impact:
   2.1What problems might this cause regarding BGP operation or overall network behaviour?
   2.2Are there specific scenarios where this would fail to establish BGP sessions?
3. Resolving: Should a link-local address always be manually assigned in such cases?

[ton31337]

This should be fixed in recent versions, what version do you use?

[TheEnbyperor]

Hi there! This is one of my students. I'll try and provide a bit more context on what they're trying to do here.

The research project is in essence looking at inconsistencies within RouteViews and RIPE RIS data. Part of this has necessitated parsing the logs from RouteViews to discover possible reasons for these inconsistencies.

Its a little unclear to us what this message means, and what its effect on the RIB and Updates would be; could you help us here?

[ton31337]

Without the configuration, version, and a bit of topo(?) we can't help you much.

[Jafaral]

What version are you running?