[BFD] BFD is Not working after system reboot.

[Kees Meijs | Nefos]

Hi Seunghwan,

Sorry for my late response (had two weeks of holiday).

Your BFD protocol block doesn't mention any interfaces. The
documentation states (see
https://bird.network.cz/?get_doc&v=20&f=bird-6.html#ss6.2) that
shouldn't be needed however:

> Note that contrary to the behavior of interface definitions of other
> protocols, BFD protocol would accept sessions (in default
> configuration) even on interfaces not covered by such definitions. 

That would suggest your configuration is valid (as far as I can tell) so
you're either hitting a bug or I misinterpreted the documentation.

What you might do is adding the interfaces carrying the BGP packets
anyway. Feels a little like a workaround, but it might help you.

Adding could be as simple as:

> protocol bfd {
>         interface "eth0" {
>         };
> }

(In this example your multihop configuration should be added again,
obviously.)

Regards,
Kees

On 03-08-2020 03:56, seunghwan hwang wrote:
> Hello K.
>
> Sorry, I'm late.
> Here is my full configuration
>
> ===================================================================
>
> log "/var/log/bird/bird.log"  { debug, trace, info, remote, warning,
> error, auth, fatal, bug };
> debug protocols all;
>
> # Loopback IP
> router id [bird-server lo ip];
>
>
> protocol kernel {
>         persist;                # Don't remove routes on bird shutdown
>         scan time 20;           # Scan kernel routing table every 20
> seconds
>         import none;            # Default is import all
>         export all;             # Default is export none
>         merge paths on;         # Enable ECMP Multi path.
> }
>
> protocol direct {
>         interface "lo";
> }
>
> protocol device {
>         scan time 10;           # Scan interfaces every 10 seconds
> }
>
> protocol bfd {
>         multihop {
>             min rx interval 300 ms;
>             min tx interval 300 ms;
>             multiplier 3;
>         };
> }
>
> protocol static {
>
>         route [swich A router-id] via [interface IP to switch A];
>         route [swich B router-id] via [interface IP to switch B] ;
> }
>
> # BGP Configuration
> protocol bgp as1 {
>         import all;
>         export all;
>
>         # local Loopback IP
>         # neighbor (tchy loopback ip)
>         local [bird-server lo ip] as 65001;
>         neighbor [swich A router-id] as 65001;
>         hold time 30;
>         enable route refresh off;
>         bfd on;
> }
>
> protocol bgp as2 {
>         import all;
>         export all;
>
>         local [bird-server lo ip] as 65001;
>         neighbor [swich B router-id] as 65001;
>         hold time 30;
>         enable route refresh off;
>         bfd on;
> }
>
> ===================================================================  
>
> Please check  it.
>
> Regards.
>
> 2020년 7월 29일 (수) 오후 4:46, Kees Meijs | Nefos <kees at nefos.nl
> <mailto:kees at nefos.nl>>님이 작성:
>
>     Hi,
>
>     Yes we have; multiple times.
>
>     Could you please provide a full configuration? (Feel free to remove
>     passwords and such, obviously.)
>
>     Cheers,
>     Kees
>
>     On 29-07-2020 09:45, seunghwan hwang wrote:
>     > Is not working.
>     > Have you ever rebooted(# shutdown -r now) with your settings?
>     > Still, only the BGP is established and the BFD state remains in
>     Init.
>     >
>

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