Unreachable next-hop over bgp

[Adrian Czapek]

W dniu 2011-08-17 19:45, Alex Bligh pisze:
>
>
> --On 17 August 2011 18:38:09 +0100 Alex Bligh <alex at alex.org.uk> wrote:
>
>> The only reason for this I can see is because bird is determining
>> reachability on the basis of its FIB only (as opposed to the kernel
>> routing table) and there is no FIB entry for 10.255.199.0/24
>> (from show route).
>>
>> How are such interface routes meant to get into the FIB?
>
> 2 further bits of information:
>
> 1. bird version 1.3.2-1 (Ubuntu Oneiric)
>
> 2. gateway-direct fixes this, but I don't understand why. If a direct
> lookup succeeds, then surely a recursive lookup must always succeed?
>


That changed in bird 1.3.0 iirc - add 'gateway direct' to your BGP 
configuration in bird (it is set to recursive by default in iBGP, and 
for some reason, it is not working in trivial iBGP setups, always 
marking routes as unreachable :)).

Regards
-- 
Adrian