[FROG] BFD peer changes logging

[Donald Sharp]

`debug bfd peer`  should turn on bfd peer debugging which will include
state change notifications.  I assume though that you really are
interested in `info` like messages ala what bgp does with `bgp
log-neighbor-change`?

donald

On Wed, Dec 9, 2020 at 12:04 PM Operations <operations at redmatter.com> wrote:
>
> Hi,
>
> We are trying to set up BFD in our current FRR setup, but we seem to be stuck on BFD not logging anything useful, particularly when peer sessions are coming up or going down.
>
> We have simply added some BFD peers (not added BFD under BGP); when we run show bfd peers brief we can see the BFD session gets established:
>
> # show bfd peers brief
> Session count: 2
> SessionId  LocalAddress                             PeerAddress                             Status
> =========  ============                             ===========                             ======
> 3339805329 xxx.xxx.xxx.194                          xxx.xxx.xxx.193                         up
> 856217853  yyy.yyy.yyy.13                           yyy.yyy.yyy.11                          up
>
> Logging is enabled:
>
> # show logging
> ...
> Logging configuration for bfdd:
> Syslog logging: level debugging, facility daemon, ident bfdd
> Stdout logging: level debugging
> File logging: level debugging, filename /var/log/frr/bfdd.log
> Protocol name: BFD
> Record priority: disabled
> Timestamp precision: 0
>
> We've expected that this will be enough to test the setup and were expected to see log lines when the session goes up or down, but get nothing. Also I couldn't find anything in the documentation that would hint that we might be missing something...
>
> Any help / pointers would be much appreciated!
>
> Best regards,
>
> Zsolt Gurmai
> NOC
> Red Matter Ltd.
>
> Operations Team  +44 333 150 2890
>                  +1 646 586 2159
>                  +61 282 443 020
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>
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