OSPF: Route attribute "ospf_tag" lost between different OSPF instances

[markus/grundmann]

I tried to use this "variable" ;-) *lol*

[snip]
        if ospf_rcv_tag = 510 then {
           ospf_metric1 = SEC_M1_VPN;
           ospf_metric2 = SEC_M2_VPN;
           accept;
        }
[/snap]


Reading configuration from /usr/local/etc/bird.conf
/usr/local/etc/bird.conf, line 275: ospf_rcv_tag: variable expected.

That's the feature I want. Where can I post a feature request??? :-)

Regards,
Markus

On 28.12.2016 00:01, Ondrej Zajicek wrote:
> On Tue, Dec 27, 2016 at 07:38:35PM +0100, markus/grundmann wrote:
>> Hello!
>>
>> I believe that I'm a user with BIRD experiences but current I have no
>> idea why the attribute "ospf_tag" from one OSPF instance to another is
>> unavailable.
> Hello
>
> The issue here is that route export to OSPF is a bit counterintuitive.
> Instead of keeping the attributes (like e.g. when route is reexported
> between BGP protocols), OSPF attributes are reset before export filters
> are executed. So both tag and metric is lost when an OSPF route is
> propagated between OSPF instances. There is a hardcoded exception for
> static routes, so you could set OSPF attributes for them directly for
> static protocols.
>
> The origin of this behavior is probably intentional (i am not sure), but
> it seems to me that it is confusing, i would assume that a route
> attribute would keep existing unless explicitly modified. It is one
> behavior i would like to change in the future.
>
> Question is what is a good default behavior when route is propagated
> between OSPF instances. Should routes keep their tags and metrics? That
> might be confusing as the metric may have different interpretations. Also
> received Ext2 route has both metric2 and metric1 part, but the second one
> have to be forgotten during reexport. Or should we have two different
> classes of OSPF route attributes (say ospf_tag and ospf_rcv_tag) to avoid
> such automatic attribute reexport without attribute modification magic?
>


-- 

Best regards,
Markus

Better Privacy with PGP encrypted Mail: http://markusgrundmann.com/pgp/
Fingerprint: 15DE 06CA 3683 C004 0A26 7086 CD81 E5D6 7D2D 4E31
Threema ID: 7ZRET2JY

„Wer die Freiheit aufgibt um Sicherheit zu gewinnen, 
 der wird am Ende beides verlieren.“ -- Benjamin Franklin

loc: 40.43153,-111.933092


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: OpenPGP digital signature
URL: <http://trubka.network.cz/pipermail/bird-users/attachments/20161228/cf0798be/attachment.asc>