[Babel-users] babel export routes from bird to routing table?

[Christof Schulze]

Hi Juliusz,

Thank you very much for your response.

>> * I am aware that babel 1.8 is not stable yet.
>
>It's stable -- I just need to take the time to do a release.
Great to hear! :) I have not seen any weird behavior in my tests with 
a small amount of nodes.

> > As Babel 1.8 will be incompatible to 1.7 

>Babeld 1.8 will be fully compatible with 1.7. It's babeld 1.9 which 
>will change the source-specific routing extension, and that extension 
>only.  If you're not using source-specific routing (SADR), you won't 
>see any incompatibilities. 
This is also great to hear, I took this from the changelog that is 
mentioning incompatible changes. 

> > So babel actually is placing a route in table 10 but not the default 
> > route that bird has placed in table 12. How would I achieve that? 

>I think there's a misunderstanding. Babeld will not copy routes from 
>import-table into export-table. It will: 

> - announce routes found in export-table over the Babel protocol; - 
> install any routes learned over the Babel protocol into import-table. 

>If there's an unfiltered default route in table 12 (your import-table), 
>it will be announced to neighbouring nodes, and will prevent babeld 
>from learning any default routes (since redistributed routes take 
>priority over routes being learned). 

>The solution to your problem is to use both tables when forwarding 
>packets, something like: 

> ip rule add prio 10 from all lookup 10
> ip rule add prio 11 from all lookup 11
> ip rule add prio 12 from all lookup 12

>If you really need the routes to be copied between the tables, please 
>let us know why, and we'll see if it's really a needed feature. 

Thank you, this solution works. At a later stage I would like to 
announce different default-routes at different places in the mesh 
network. It seems to me like I might be better off not using table 12 as 
an import-route so any static default routes on the gateway-side will 
not interfere with whatever babeld is announcing. What do you think?

Christof

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