Enabling BGP FlowSpec routes export

[Maria Matějka]

Hello!

You won't advertise anything else than basic IPv4 routes with capabilities off
as the flowspec SAFI needs to be advertised and negotiated by a BGP Capability Advertisement.

Maria

On 1/21/20 2:05 PM, posta at davidepucci.it wrote:
> Hi.
> I'm setting up Bird (2.0.7) as a BGP FlowSpec controller and it has to send out FS routes to two (FRR-based) neighbors.
> Actual configuration is defined as below:
> 
> flow4 table flowtab4;
> protocol static {
>         flow4 {
>         import all;
>         export all;
>     };
> 
>         route flow4 {
>                 src x.x.y.y/32;
>                 dst x.x.z.z/32;
>         } {
>                 bgp_ext_community.add( (generic, 0x80060000, 0x0) );
>         };
> }
> template bgp bgp_fs {
>     local x.x.x.x as ABCDG;
>     capabilities off;
> 
>         flow4 {
>         table flowtab4;
>                 import all;
>                 export all;
>         };
> 
>     ipv4 {
>         import all;
>         export all;
>     };
> }
> protocol bgp bgp_svc01 from bgp_fs {
>     neighbor y.y.y.y as ABCDE;
> }
> protocol bgp bgp_svc02 from bgp_fs {
>      neighbor z.z.z.z as ABCDF;
> }
> 
> The FS is properly assigned to the BGP protocol instances, but flowtab4 table is only UP as a channel for static1 protocol,
> while for bgp_svc01/02 is not (hence, no FS routes advertised BGP-side):
> 
> bird> show protocol all static1
> Name       Proto      Table      State  Since         Info
> static1    Static     flowtab4   up     13:02:42.987
>   Channel flow4
>     State:          UP
>     ==================
>     Table:          flowtab4
>     Preference:     200
>     Input filter:   ACCEPT
>     Output filter:  ACCEPT
>     Routes:         1 imported, 0 exported, 1 preferred
>     Route change stats:     received   rejected   filtered    ignored   accepted
>       Import updates:              1          0          0          0          1
>       Import withdraws:            0          0        ---          0          0
>       Export updates:              0          0          0        ---          0
>       Export withdraws:            0        ---        ---        ---          0
> 
> bird> show protocol all bgp_svc01
> Name       Proto      Table      State  Since         Info
> bgp_svc01  BGP        ---        up     13:00:17.256  Established
>   BGP state:          Established
>     Neighbor address: y.y.y.y
>     Neighbor AS:      ABCDE
>     Local AS:         ABCDG
>     Neighbor ID:      whateverID
>     Local capabilities
>     Neighbor capabilities
>     Session:          external
>     Source address:   x.x.x.x
>     Hold timer:       4.820/9
>     Keepalive timer:  2.054/3
>   Channel flow4
>     State:          DOWN
>     ====================
>     Table:          flowtab4
>     Preference:     100
>     Input filter:   ACCEPT
>     Output filter:  ACCEPT
>   Channel ipv4
>     State:          UP
>     Table:          master4
>     Preference:     100
>     Input filter:   ACCEPT
>     Output filter:  ACCEPT
>     Routes:         13 imported, 2 exported, 13 preferred
>     Route change stats:     received   rejected   filtered    ignored   accepted
>       [...]
>     BGP Next hop:   x.x.x.x
> 
> Looking forward to get some clarifications.
> Thank you.
> 
> Kind regards,
> Davide Pucci.

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