BGP Flowspec VPNv4/VPNv6

[Vincent Bernat]

On 2024-10-26 02:14, Ondrej Zajicek wrote:

>> I would be interested in implementing BGP Flowspec for VPNv4/VPNv6. Hacking
>> flow4/flow6 to be VPNv4/VPNv6 instead of IPv4/IPv6 instead is easy, but I am
>> unsure of the right way to *add* VPNv4/VPNv6. Should I add flowvpn4/flowvpn6
>> tables or reuse flow4/flow6 and only add "vpn4/vpn6 flow" channels to the
>> BGP protocol?
> 
> Hi
> 
> I think you would need to add flowvpn4/flowvpn6 tables and also new
> net_addr subtypes to lib/net.h, as it is a new route type with a slightly
> different semantic (specifically RD is a part of the table key). That is
> mostly a copy-and-paste job from the regular flowspec nettypes.
> 
> Well, alternatively one could add RD to regular net_addr_flowX, keep it
> zero for regular flowspec with the argument that flowspec NLRI are huge
> anyways, so unused u64 for RD does not matter. But for the uniformity i
> would prefer the first approach.
> 
> Different net type leads naturally to different rtables.

Thanks. Should I wait for BIRD 3 or it is OK to start on BIRD 2?