Hello again, After checking the code I answered my first question, leaving the solution here: Bird returns an error if you define anything else than 0 after the network mask. aaaa:bbbb:0100:00ff:: defines 64 bits, so you cannot set a mask bigger than 64. Though it is not standard behaviour, it is understandable. Remains my second question, how can I handle the case where the prefix-set is empty ? Regards, On 15/08/17 10:33 AM, Damien Clabaut wrote:

Hello,

I am trying to use prefix-set inside a filter in IPv6:

filter my_filter6 prefix set my_prefixset6; { my_prefixset6 = [aaaa:bbbb:100:ff::/56]; if (net ~ my_prefixset6) then { bgp_local_pref = 104; }

accept;

}

But I get the following error:

birdc6 BIRD 1.6.3 ready. bird> configure check

Invalid network prefix: aaaa:bbbb:100:ff::/56.

Am I doing anything wrong ?

Also, the prefix set is dynamically updated via script, is there a correct way to handle the case where it is empty ?

Or should the scripts comment the definition of prefix-set and the complete "if" block ?

Regards,

-- Damien Clabaut R&D vRouter ovh.qc.ca