case & string

[Mikhail Mayorov]

Hi!

I try make route reflector using bird for 20 BGP routers in my network. 
4 of them have many RIB and have fullview with over millions routes. But 
over needs only local ASN's routes and default.

I was try configure dynamic peers . But I can't known context of which 
the filter is executed. I need to identify the neighbor with whom I have 
a session.

To do this, I was forced to abandon dynamic neighbors and create a 
separate config for each neighbor. This is certainly not difficult, but 
very inconvenient. Moreover, the filtering process is also very 
important for marking routes by different communities. I didn't find any 
mechanisms to do this with dynamic neighbors. Probably this option is 
not very popular with the community and it is rarely used. Or maybe I'm 
just being stupid. :)

10.10.2024 00:13, Alexander Zubkov пишет:
> Hi,
>
> There is "from" attribute that should contain the IP address of a 
> remote router received via bgp protocol. But if you want to know the 
> router ID - I do not know about such attribute.
>
> On Wed, Oct 9, 2024 at 12:38 PM Mikhail Mayorov <mm at tagan.ru> wrote:
>
>     Hi
>
>     Thank you for explain. Of course you are right, I replace string
>     with int and got similar functionality. For me it doesn't matter.
>
>     I already wrote about dynamic BGP protocols and a import/export
>     filter in which I need to understand with whom I have a session
>     for correct filtering. It would be very useful to add to route
>     attributes "routerid", "source ip" or "BGP.hostname". This
>     functionality is similar to the "proto" route attribute, but if
>     use bgp dynamic protocols creating attribute "proto" is meaningless.
>
>     I find сustom attributes have to be first declared by "attribute"
>     global option. This suits me, but I can't find ways to assign the
>     required value.
>
>     Also, name of dynamic proto will be more filled with meaning if
>     use hostname or routerid.
>
>     08.10.2024 18:07, Ondrej Zajicek пишет:
>>     On Tue, Oct 08, 2024 at 12:16:42PM +0300, Mikhail Mayorov wrote:
>>>     Hi!
>>>
>>>     I try use CASE and string variable and a have error.... I checked User's
>>>     guide 2.0<https://bird.network.cz/?get_doc&f=bird.html&v=20> <https://bird.network.cz/?get_doc&f=bird.html&v=20>.... CASE use
>>>     operator ~.  This operator applies to string variables. What am I doing
>>>     wrong?
>>     Hi
>>
>>     Seems like a discrepancy between functionality and documentation.
>>     The description of 'case' [1] says:
>>
>>         The expression after case can be of any type which can be on the left
>>         side of the ~ operator and anything that could be a member of a set is
>>         allowed
>>
>>     But in fact, only the second part is true, only values that could be
>>     members of sets are allowed (with the exception of prefixes, as prefix
>>     sets are implemented in a different way). According to [2], that are:
>>
>>     int | pair | quad | ip | prefix | ec | lc | enum
>>
>>     We probably should fix 'case' for prefixes. Looking at it now, there is
>>     also vpnrd, which is allowed in set, but undocumented, and not in switch.
>>
>>     In principle, we could extend sets / case to contain strings / bytesrings,
>>     but i do not really see use case.
>>
>>     [1]https://bird.network.cz/?get_doc&v=20&f=bird-5.html#control-structures <https://bird.network.cz/?get_doc&v=20&f=bird-5.html#control-structures>
>>     [2]https://bird.network.cz/?get_doc&v=20&f=bird-5.html#type-set <https://bird.network.cz/?get_doc&v=20&f=bird-5.html#type-set>
>>
>>
>>>     [root at wine etc]# cat 123.conf && bird -c ./123.conf -p
>>>     function teststring(string myvar) -> bool
>>>        {
>>>        case myvar {
>>>          "text A" : print "A"; return true;
>>>          "text B" : print "B"; return true;
>>>          "text C" : print "C"; return true;
>>>          else : print "unknown"; return false;
>>>          }
>>>        }
>>>     bird: ./123.conf:4:12 syntax error, unexpected TEXT
>>>
>>>     -- 
>>>
>>>     Regards,
>>>     Mikhail Mayorov
>     -- 
>
>     Regards,
>     Mikhail Mayorov
>     PG19, founder and inspirer
>     B.Bulvarnaya 11, Taganrog, Russia, 347913
>     tel work: +7 8634 431431 (ext 101)
>     tel mobile: +7 905 4309006
>
>     pg19.ru
>
-- 

Regards,
Mikhail Mayorov
PG19, founder and inspirer
B.Bulvarnaya 11, Taganrog, Russia, 347913
tel work: +7 8634 431431 (ext 101)
tel mobile: +7 905 4309006

pg19.ru
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