Route redistribution between OSPF instances

[Ondrej Zajicek]

On Mon, Mar 04, 2019 at 04:54:10PM +0300, Yaroslav Dronskii wrote:
> Hello, I need some help in understanding bird. Route redistribution between
> ospf instances doesn't work for me.
> I tried everything I could think of short of debugging source code, and
> narrowed it down to route type.
> If it's RTS_OSPF_IA, ospf_metric2 is set to LSINFINITY.

Hello

This seems like a bug in BIRD. OSPF generated routes other than E2 (type
2 external) have attribute ospf_metric2 set to LSINFINITY, but when a
route is exported to OSPF and have ospf_metric2 set (even to LSINFINITY),
then it is generated as E2 with given metric. We should generate
ospf_metric2 attribute only for E2 routes.

There is a simple workaround: In OSPF export filter, use this command:

  unset(ospf_metric2);

That would generate E1 routes from IA routes. Or just set ospf_metric2 to
a sane value to generate E2 routes.


> How route is seen:
> Imported from other vm host via ospf:
> bird> show route table table_ospf_0 10.20.5.135/32 all
> Table table_ospf_0:
> 10.20.5.135/32       unicast [ospf_vm 13:52:53.209] IA (150/20)
> [10.255.10.129]
>         via 10.133.146.12 on ospf0-br
>         Type: OSPF-IA univ

This seems like another bug, there should be list of OSPF attributes.

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."