Direct routes and OSPF

Alasdair Muckart alasdairmuckart at catalyst.net.nz
Thu Nov 26 21:17:31 CET 2020


I've got a question about importing direct routes and interaction with BGP & OSPF.

We have an issue with BIRD (1.6.3) when we do a 'configure soft' we end up with
linknet routes being learned via indirect paths over OSPF which breaks BFD and BGP.

It only happens with IPv6, not IPv4.

Given routers A, B, C and D:

A----B
|    |
C----D

Doing a 'birdc6 configure soft' on router A will sometimes end up with the
linknet for A-C being put in the kernel table by OSPF learned from B.

Not all interfaces are part of OSPF and I'm wondering if importing direct routes
into BIRD for all interfaces would stop OSPF from trying to insert the routes
into the kernel table?

Any ideas would be greatly appreciated.

Thanks.
-- 
Alasdair Muckart (he/him)
Network Engineer
Catalyst IT - Expert Open Source Solutions
Mobile: +64 22 638 5141 | DDI: +64 4 897 7794 | www.catalyst.net.nz

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