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@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-thei...
``` 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