When configuring BFD from VyOS CLI, defined values are not correctly applied to the FRRouting configuration, causing incorrect operation:
vyos@VyOS-RR1:~$ show version Version: VyOS 1.4-rolling-202111160742 Release train: sagitta Built by: autobuild@vyos.net Built on: Tue 16 Nov 2021 07:42 UTC Build UUID: 87f482f0-189a-4b17-8397-dd927f9ff955 Build commit ID: 22a1b786c3c17c Architecture: x86_64 Boot via: installed image System type: KVM guest Hardware vendor: QEMU Hardware model: Standard PC (i440FX + PIIX, 1996) Hardware S/N: Hardware UUID: 0526ae76-b6b2-41e6-ac7a-5fd184a3f9bb Copyright: VyOS maintainers and contributors vyos@VyOS-RR1:~$ show configuration commands | match bfd set protocols bfd peer 10.0.0.1 multihop set protocols bfd peer 10.0.0.1 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.1 source address '10.0.0.11' set protocols bfd peer 10.0.0.2 multihop set protocols bfd peer 10.0.0.2 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.2 source address '10.0.0.11' set protocols bfd peer 10.0.0.3 multihop set protocols bfd peer 10.0.0.3 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.3 source address '10.0.0.11' set protocols bfd peer 10.0.0.4 multihop set protocols bfd peer 10.0.0.4 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.4 source address '10.0.0.11' set protocols bfd peer 10.0.0.111 multihop set protocols bfd peer 10.0.0.111 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.111 source address '10.0.0.11' set protocols bfd peer 10.0.0.112 multihop set protocols bfd peer 10.0.0.112 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.112 source address '10.0.0.11' set protocols bfd peer 10.1.11.0 profile 'BFD_OSPF' set protocols bfd peer 10.2.11.0 profile 'BFD_OSPF' set protocols bfd profile BFD_OSPF interval multiplier '3' set protocols bfd profile BFD_OSPF interval receive '300' set protocols bfd profile BFD_OSPF interval transmit '300' set protocols bfd profile BFD_iBGP interval multiplier '3' set protocols bfd profile BFD_iBGP interval receive '3000' set protocols bfd profile BFD_iBGP interval transmit '3000' set protocols bgp peer-group iBGP bfd set protocols ospf interface eth1 bfd set protocols ospf interface eth2 bfd vyos@VyOS-RR1:~$ vtysh Hello, this is FRRouting (version 7.5.1-20210619-12-g3f8a74e70). Copyright 1996-2005 Kunihiro Ishiguro, et al. VyOS-RR1# show running-config Building configuration... Current configuration: ! frr version 7.5.1-20210619-12-g3f8a74e70 frr defaults traditional hostname VyOS-RR1 log syslog log facility local7 service integrated-vtysh-config ! interface eth1 ip ospf bfd ip ospf network point-to-point ! interface eth2 ip ospf bfd ip ospf network point-to-point ! router bgp 65000 bgp router-id 10.0.0.11 no bgp ebgp-requires-policy no bgp default ipv4-unicast bgp cluster-id 10.0.0.0 no bgp network import-check neighbor iBGP peer-group neighbor iBGP remote-as internal neighbor iBGP bfd neighbor iBGP update-source 10.0.0.11 neighbor 10.0.0.1 peer-group iBGP neighbor 10.0.0.2 peer-group iBGP neighbor 10.0.0.3 peer-group iBGP neighbor 10.0.0.4 peer-group iBGP neighbor 10.0.0.111 peer-group iBGP neighbor 10.0.0.112 peer-group iBGP ! address-family ipv4 vpn neighbor 10.0.0.1 activate neighbor 10.0.0.1 addpath-tx-all-paths neighbor 10.0.0.1 route-reflector-client neighbor 10.0.0.2 activate neighbor 10.0.0.2 addpath-tx-all-paths neighbor 10.0.0.2 route-reflector-client neighbor 10.0.0.3 activate neighbor 10.0.0.3 addpath-tx-all-paths neighbor 10.0.0.3 route-reflector-client neighbor 10.0.0.4 activate neighbor 10.0.0.4 addpath-tx-all-paths neighbor 10.0.0.4 route-reflector-client neighbor 10.0.0.111 activate neighbor 10.0.0.111 addpath-tx-all-paths neighbor 10.0.0.111 route-reflector-client neighbor 10.0.0.112 activate neighbor 10.0.0.112 addpath-tx-all-paths neighbor 10.0.0.112 route-reflector-client exit-address-family ! router ospf ospf router-id 10.0.0.11 log-adjacency-changes auto-cost reference-bandwidth 10000 timers throttle spf 200 1000 10000 passive-interface dum0 network 0.0.0.0/0 area 0 ! line vty ! bfd profile BFD_OSPF ! profile BFD_iBGP transmit-interval 3000 receive-interval 3000 ! peer 10.1.11.0 ! peer 10.2.11.0 ! peer 10.0.0.1 multihop local-address 10.0.0.11 ! peer 10.0.0.2 multihop local-address 10.0.0.11 ! peer 10.0.0.3 multihop local-address 10.0.0.11 ! peer 10.0.0.4 multihop local-address 10.0.0.11 ! peer 10.0.0.111 multihop local-address 10.0.0.11 ! peer 10.0.0.112 multihop local-address 10.0.0.11 ! ! end
As it's visible from the output, there are 2 BFD profiles created with different tx/rx intervals: BFD_OSPF 300/300 x3, and BFD_iBGP 3000/3000 x3. Each of them has been applied to the different protocols OSPF and BGP accordingly. Looking for the FRR configuration, we can see the following issues:
- BFD_OSPF was created but didn't apply any parameter from the defined through the VyOS CLI:
VyOS
set protocols bfd profile BFD_OSPF interval multiplier '3' set protocols bfd profile BFD_OSPF interval receive '300' set protocols bfd profile BFD_OSPF interval transmit '300'
FRR
bfd profile BFD_OSPF !
Instead, FRR should have the following lines:
bfd profile BFD_OSPF transmit-interval 300 receive-interval 300 !
- Under the OSPF interface peers BFD profile has not been added. It should include the following lines:
VyOS
set protocols bfd peer 10.1.11.0 profile 'BFD_OSPF' set protocols bfd peer 10.2.11.0 profile 'BFD_OSPF'
FRR
bfd peer 10.1.11.0 ! peer 10.2.11.0 !
Instead, FRR should have the following lines:
bfd peer 10.1.11.0 profile BFD_OSPF ! peer 10.2.11.0 profile BFD_OSPF !
- BFD profile not applied under the FRR BGP configuration:
VyOS
set protocols bgp peer-group iBGP bfd set protocols bfd peer 10.0.0.1 multihop set protocols bfd peer 10.0.0.1 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.1 source address '10.0.0.11' set protocols bfd peer 10.0.0.2 multihop set protocols bfd peer 10.0.0.2 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.2 source address '10.0.0.11' set protocols bfd peer 10.0.0.3 multihop set protocols bfd peer 10.0.0.3 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.3 source address '10.0.0.11' set protocols bfd peer 10.0.0.4 multihop set protocols bfd peer 10.0.0.4 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.4 source address '10.0.0.11' set protocols bfd peer 10.0.0.111 multihop set protocols bfd peer 10.0.0.111 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.111 source address '10.0.0.11' set protocols bfd peer 10.0.0.112 multihop set protocols bfd peer 10.0.0.112 profile 'BFD_iBGP' set protocols bfd peer 10.0.0.112 source address '10.0.0.11'
FRR
router bgp 65000 neighbor iBGP peer-group neighbor iBGP remote-as internal neighbor iBGP bfd neighbor iBGP update-source 10.0.0.11 neighbor 10.0.0.1 peer-group iBGP neighbor 10.0.0.2 peer-group iBGP neighbor 10.0.0.3 peer-group iBGP neighbor 10.0.0.4 peer-group iBGP neighbor 10.0.0.111 peer-group iBGP neighbor 10.0.0.112 peer-group iBGP
Instead, FRR should have the following lines:
router bgp 65000 neighbor iBGP peer-group neighbor iBGP remote-as internal neighbor iBGP bfd profile BFD_iBGP neighbor iBGP update-source 10.0.0.11 neighbor 10.0.0.1 peer-group iBGP neighbor 10.0.0.2 peer-group iBGP neighbor 10.0.0.3 peer-group iBGP neighbor 10.0.0.4 peer-group iBGP neighbor 10.0.0.111 peer-group iBGP neighbor 10.0.0.112 peer-group iBGP
After adding those statements under the FRR configuration and restarting BFD process all intervals are shown correctly under the BFD peering status information:
Before the changes
vyos@VyOS-RR1:~$ show protocols bfd peer 10.0.0.111
BFD Peer:
peer 10.0.0.111 multihop local-address 10.0.0.11 vrf default
ID: 915215337
Remote ID: 2021107414
Active mode
Minimum TTL: 254
Status: up
Uptime: 30 minute(s), 1 second(s)
Diagnostics: ok
Remote diagnostics: ok
Peer Type: configured
Local timers:
Detect-multiplier: 3
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 50ms
Remote timers:
Detect-multiplier: 3
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 50msAfter the changes
vyos@VyOS-RR1:~$ vtysh
Hello, this is FRRouting (version 7.5.1-20210619-12-g3f8a74e70).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
VyOS-RR1# configure
VyOS-RR1(config)# router bgp 65000
VyOS-RR1(config-router)# neighbor iBGP bfd profile BFD_iBGP
VyOS-RR1(config-router)# end
VyOS-RR1# exit
vyos@VyOS-RR1:~$ show protocols bfd pe
peer peers
vyos@VyOS-RR1:~$ show protocols bfd peer 10.0.0.111
BFD Peer:
peer 10.0.0.111 multihop local-address 10.0.0.11 vrf default
ID: 915215337
Remote ID: 2021107414
Active mode
Minimum TTL: 254
Status: up
Uptime: 32 minute(s), 4 second(s)
Diagnostics: ok
Remote diagnostics: ok
Peer Type: configured
Local timers:
Detect-multiplier: 3
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 50ms
Remote timers:
Detect-multiplier: 3
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 50ms
vyos@VyOS-RR1:~$ restart bfd
WARNING: This is a potentially unsafe function!
You may lose the connection to the router or active configuration after
running this command. Use it at your own risk!
Continue? [y/N] y
vyos@VyOS-RR1:~$ show protocols bfd peer 10.0.0.111
BFD Peer:
peer 10.0.0.111 multihop local-address 10.0.0.11 vrf default
ID: 578382690
Remote ID: 2021107414
Active mode
Minimum TTL: 254
Status: init
Diagnostics: ok
Remote diagnostics: neighbor signaled session down
Peer Type: configured
Local timers:
Detect-multiplier: 3
Receive interval: 3000ms
Transmission interval: 3000ms
Echo transmission interval: 50ms
Remote timers:
Detect-multiplier: 3
Receive interval: 1000ms
Transmission interval: 1000ms
Echo transmission interval: 50msIn the case of BFD_OSPF, when it's deleted from the VyOS configuration and reconfigured from the scratch, the same result appears and it's being added to the FRR configuration without defined values.