BGP communities

[Fabiano D'Agostino]

and how these kind of checks are handled?
if (myas,peeras) ~ bgp_community  what is bgp_community?

Thanks,

Il giorno lun 6 apr 2020 alle ore 15:32 Fabiano D'Agostino <
fabiano.dagostino96 at gmail.com> ha scritto:

> Thank you, but "if the route does not come from BGP then false"
> here I have:
> protocol pipe a {
>     table master;
>     mode transparent;
>     peer table a;
>     import all;
>     export where bgp_out(x); => this becomes false, what does this mean?
>     #export all;
> }
>
> Thanks,
>
> Il giorno lun 6 apr 2020 alle ore 10:50 Bernd Naumann <
> bena at spreadshirt.net> ha scritto:
>
>> On 05.04.20 23:08, Fabiano D'Agostino wrote:
>> > Good evening,
>> > could someone explain me the meaning of these lines?
>> >
>> > function bgp_out(int peeras)
>> > {
>> > if ! (source = RTS_BGP ) then return false;
>> > if peeras > 65535 then return true; ### communities do not support AS32
>> > if (0,peeras) ~ bgp_community then return false;
>> > if (myas,peeras) ~ bgp_community then return true;
>> > if (0, myas) ~ bgp_community then return false;
>> > return true;
>> > }
>> >
>> > Thanks,
>> >
>> > Fabiano
>> >
>>
>> Morning,
>>
>> I can not cover the whole section but as a start...
>>
>> * if the route does not come from BGP then false (routing table source?)
>> * if the remote AS Number is greater 65535 (16 Bit) then "just" return
>> true (see AS 32 Bit Numbers, and the non-support of older
>> devices/implementations)
>> * For the next 3 I'm not 100% sure how to read but I found
>>
>> https://bird-users.network.narkive.com/3uDbo6H9/any-ix-willing-to-share-their-config
>>
>> ```
>> 0:XXXXX - Do not announce route to peer XXXXX
>> 0:MyASN - Do not announce route to all peers
>> MyASN:XXXXX - Announce route to peer XXXXX only
>> MyASN:MyASN - Announce routes to all peers. This community is
>> automatically added to all routes that are not
>> tagged with any of MyASN:XXXXX communities.
>> ```
>>
>> Maybe this helps a little bit.
>>
>> Bernd
>>
>
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