Failed to Delete Interval Settings from BFD Profile

[HollyGurza]

Description

The reload configuration fails when attempting to remove the echo transmit-interval or echo receive-interval parameters from a bfd profile. However, if the configuration is initially applied without these parameters, the reload is successful. Afterward, the parameters can be added, but they cannot be deleted.

# sudo /usr/lib/frr/frr-reload.py --reload --daemon bfdd tmp_config
Failed to execute bfd  profile internal   no echo transmit-interval 700  exit exit
"bfd --  profile internal --   no echo transmit-interval 700 --  exit -- exit" we failed to remove this command
% Unknown command:   no echo transmit-interval 700

Failed to execute bfd  profile internal   no echo receive-interval 700  exit exit
"bfd --  profile internal --   no echo receive-interval 700 --  exit -- exit" we failed to remove this command
% Unknown command:   no echo receive-interval 700

[7719|mgmtd] sending configuration
[7720|zebra] sending configuration
[7721|ripd] sending configuration
[7722|ripngd] sending configuration
[7723|ospfd] sending configuration
[7724|ospf6d] sending configuration
[7725|ldpd] sending configuration
[7726|bgpd] sending configuration
[7727|isisd] sending configuration
[7720|zebra] done
MGMTD: No changes found to be committed!
[7721|ripd] done
[7722|ripngd] done
[7719|mgmtd] done
[7723|ospfd] done
[7724|ospf6d] done
[7731|babeld] sending configuration
[7725|ldpd] done
[7733|fabricd] sending configuration
[7727|isisd] done
[7734|watchfrr] sending configuration
[7726|bgpd] done
[7736|staticd] sending configuration
[7737|bfdd] sending configuration
Waiting for children to finish applying config...
[7731|babeld] done
[7740|pim6d] sending configuration
[7734|watchfrr] done
[7733|fabricd] done
[7736|staticd] done
[7737|bfdd] done
[7740|pim6d] done
[7744|mgmtd] sending configuration
[7745|zebra] sending configuration
[7746|ripd] sending configuration
[7747|ripngd] sending configuration
[7748|ospfd] sending configuration
[7749|ospf6d] sending configuration
[7750|ldpd] sending configuration
[7751|bgpd] sending configuration
[7752|isisd] sending configuration
[7756|babeld] sending configuration
[7758|fabricd] sending configuration
[7759|watchfrr] sending configuration
[7745|zebra] done
[7747|ripngd] done
[7748|ospfd] done
MGMTD: No changes found to be committed!
[7751|bgpd] done
[7750|ldpd] done
[7746|ripd] done
[7744|mgmtd] done
[7749|ospf6d] done
[7752|isisd] done
[7759|watchfrr] done
[7761|staticd] sending configuration
[7762|bfdd] sending configuration
[7758|fabricd] done
[7756|babeld] done
Waiting for children to finish applying config...
[7765|pim6d] sending configuration
[7762|bfdd] done
[7761|staticd] done
[7765|pim6d] done

Version

vtysh -c "show version"
FRRouting 9.1.1 (vyos) on Linux(6.6.49-amd64-vyos).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
configured with:
    '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--disable-option-checking' '--disable-silent-rules' '--libdir=${prefix}/lib/x86_64-linux-gnu' '--libexecdir=${prefix}/lib/x86_64-linux-gnu' '--disable-maintainer-mode' '--localstatedir=/var/run/frr' '--sbindir=/usr/lib/frr' '--sysconfdir=/etc/frr' '--with-vtysh-pager=/usr/bin/pager' '--libdir=/usr/lib/x86_64-linux-gnu/frr' '--with-moduledir=/usr/lib/x86_64-linux-gnu/frr/modules' '--disable-dependency-tracking' '--enable-rpki' '--enable-scripting' '--enable-pim6d' '--with-libpam' '--enable-doc' '--enable-doc-html' '--enable-snmp' '--enable-fpm' '--disable-protobuf' '--disable-zeromq' '--enable-ospfapi' '--enable-bgp-vnc' '--enable-multipath=256' '--enable-user=frr' '--enable-group=frr' '--enable-vty-group=frrvty' '--enable-configfile-mask=0640' '--enable-logfile-mask=0640' 'build_alias=x86_64-linux-gnu' 'PYTHON=python3'

How to reproduce

I have two config files as examples:
first:

!
frr version 9.1.1
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
ip route 0.0.0.0/0 192.168.122.1 eth0 tag 210 210
!
rpki
exit
!
bfd
 profile internal
  echo-mode
 exit
 !
 peer 45.86.210.211 interface tun1
  profile internal
 exit
 !
exit
!
end

second:

!
frr version 9.1.1
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
ip route 0.0.0.0/0 192.168.122.1 eth0 tag 210 210
!
rpki
exit
!
bfd
 profile internal
  echo-mode
  echo transmit-interval 700
  echo receive-interval 700
 exit
 !
 peer 45.86.210.211 interface tun1
  profile internal
 exit
 !
exit
!
end

steps to reproduce:

1. apply first config:
   /usr/lib/frr/frr-reload.py --reload --daemon bfdd first
2. apply the second cofig with additional interval params
   /usr/lib/frr/frr-reload.py --reload --daemon bfdd second
3. apply first config again to delete interval params
   /usr/lib/frr/frr-reload.py --reload --daemon bfdd first

Expected behavior

Both configurations are applied successfully regardless of the calling sequence.

Actual behavior

can't delete information about interval setting:

Failed to execute bfd  profile internal   no echo transmit-interval 700  exit exit
"bfd --  profile internal --   no echo transmit-interval 700 --  exit -- exit" we failed to remove this command
% Unknown command:   no echo transmit-interval 700

Failed to execute bfd  profile internal   no echo receive-interval 700  exit exit
"bfd --  profile internal --   no echo receive-interval 700 --  exit -- exit" we failed to remove this command
% Unknown command:   no echo receive-interval 700

Additional context

No response

Checklist

• I have searched the open issues for this bug.
• I have not included sensitive information in this report.