IPv6 BGP & kernel 4.19

Robert Sander r.sander at heinlein-support.de
Wed Jun 19 09:10:53 CEST 2019


our routers run on Debian stretch with bird 1.6.4 from

Yesterday I tried kernel 4.19 from backports.debian.org and ran into a
weird issue with IPv6 BGP sessions:

All Peerings reported "Error: Hold timer expired" ca. every 40 minutes.

IPv6 forwarding was flapping all the time.

After rebooting into kernel 4.9 everything worked again.

IPv4 BGP was not affected and also OSPF (v4 and v6). I could disable all
IPv6 BGP peerings on this router and then it forwarded to another router
learned via OSPF for IPv6 without issues.

Has anyone seen such a behaviour?

Robert Sander
Heinlein Support GmbH
Schwedter Str. 8/9b, 10119 Berlin


Tel: 030 / 405051-43
Fax: 030 / 405051-19

Amtsgericht Berlin-Charlottenburg - HRB 93818 B
Geschäftsführer: Peer Heinlein - Sitz: Berlin

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