BIRD 1.4.2 - some strange things

[Javor Kliachev]

Dear Ondrej,

Thanks a lot for your prompt and detailed explanation.

I've just tried your solution and it seems to work fine.

*# RS2:*
/bird> show route where proto !="R0_100" table T65535 count//
//*4086*//of 8552 routes for 3388 networks/

*# RS1:*
/root at rs1-bird:~# birdc show bgp su | grep //*R0_200*//
//desc                             proto              ip            
AS           state                    rcv / adv / limit //
//0.200_iBGP_RS2          R0_200     10.0.0.200        65535 2014-04-23 
//*4085*///4466/10000 Established/

Best~

On 04/25/2014 12:27 AM, Ondrej Zajicek wrote:
> On Wed, Apr 23, 2014 at 04:31:50PM +0300, Javor Kliachev wrote:
>> Hello,
>>
>> After upgrade from 1.3.9 to 1.4.2, we're observing following things:
>>
>> *1) Testing ADD-PATH feature on iBGP:**
>> *
>> With AS-PATH functionality everything looks fine but:
>>
>> How we may see all exported routes to given iBGP member with "add paths
>> on" enabled.
>>
>> I have tried with:
>>
>> root at rs2-nix-bird:~# birdc show route export R0_100 count
>> *2796* of 3377 routes for 3377 networks
> Yes, 'show route export' shows bad information here, it ignores
> the fact that 'add paths' is enabled.
>
> BIRD does not store information whether the route was exported to the
> protocol, it just computes whether it would be exported during 'show
> route export', so it may show different information because of bugs or
> reconfiguring.
>
>> *So my question is*: Is there any other command to see all exported
>> prefixes when as-path is enabled.
> Not really, but 'show route export' should be fixed.
>
> You could just use 'show route where proto != "R0_100"' if you have
> 'export all' or something similar.
>
>
>> *2) BGP Route limit - strange thing:*
>>
>> With the new version, today I observed that when "BGP protocol" has
>> configured limit to 1, every time
>> when we run "birdc configure" the session from UP goes DOWN and back to
>> UP and then stay ESTABLISHED
>> with following reason:
>>
>> It is happen absolutely everytime when we run "birdc configure".
> Seems like when route is received, the limit is perceived as less or
> equal, while during reconfigure it is perceived as strictly less. The
> documentation is not unambiguous w.r.t. this issue, but i would guess
> that understanding limits as less or equal is probably what users
> expect.
>
>

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*Javor Kliachev*
IP Engineer

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