On February 5, 2020 8:44:54 PM GMT+01:00, "Alex D." <listensammler@gmx.de> wrote:

Hi,
does anybody know something about the behavior observed ?
Regards,
Alex

-------- Original-Nachricht --------

Betreff:	BGP session closed after receipt of flowspec route without destination prefix
Datum:	Fri, 24 Jan 2020 21:33:17 +0100
Von:	Alex D. <listensammler@gmx.de>
An:	bird-users@network.cz

Hi,

i configured the following flowspec route on a Juniper router:
route v6test {
    match {
        source 2a02:xxxx:xxxx:xxxx::1/128;
    }
    then discard;
}

The route was accepted on my Juniper router and blocked all traffic from src ip 2a02:xxxx:xxxx:xxxx::1 as expected. After advertising the route, BIRD closed the BGP session. Is this an expected behaviour, means does is it necessary, that a dst prefix for a flowspec route must exist ?

Log:
2020-01-24 09:52:26.750 <RMT> vs_dis_r1_6838: No dst prefix at first pos
2020-01-24 09:52:26.750 <RMT> vs_dis_r1_6838: Error: Malformed attribute list
2020-01-24 09:52:26.750 <TRACE> vs_dis_r1_6838: BGP session closed

BIRD accepted the route after changing to:
route v6test {
    match {
        destination ::/0;
        source 2a02:xxxx:xxxx:xxxx::1/128;
    }
    then discard;
}

Regards,
Alex