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Maniphest T2616

BFD Configuration causes flapping
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Description

The following BFD configuration causes the 10.0.10.12 peer to flap constantly:

admin@edge# show protocols bfd
 peer 10.0.10.11 {
     source {
         address 10.0.10.1
     }
 }
 peer 10.0.10.12 {
     source {
         address 10.0.10.1
     }
 }

It works perfectly with either this config:

admin@edge# show protocols bfd
 peer 10.0.10.11 {
     source {
         address 10.0.10.1
     }
 }
 peer 10.0.10.12 {
     source {
         interface eth0.10
     }
 }

or this config:

peer 10.0.10.11 {
    source {
        interface eth0.10
    }
}
peer 10.0.10.12 {
    source {
        interface eth0.10
    }
}

This is the example of the error from the VyOS side:

Jun 19 03:35:09 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:09 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:09 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:09 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:09 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] up -> down reason:neighbor-down
Jun 19 03:35:10 edge bfdd[1222]: state-change: [mhop:no peer:10.0.10.12 local:0.0.0.0 vrf:default ifname:eth0.10] down -> up

And this is what it looks like from the peer side:

jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection closed 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection opened by remote host 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection closed 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection opened by remote host 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection closed 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection opened by remote host 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection closed 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection opened by remote host 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1 
jun/18 22:35:10 route,bgp,info Connection closed 
jun/18 22:35:10 route,bgp,info     RemoteAddress=10.0.10.1

Details

Version
1.3
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

Related Objects

Event Timeline

kroy created this task.Jun 19 2020, 3:44 AM
pasik subscribed.Oct 19 2020, 12:18 PM
erkin set Issue type to Bug (incorrect behavior).Aug 30 2021, 5:11 AM
erkin removed a subscriber: Global Notifications.
syncer edited projects, added VyOS 1.3 Equuleus (1.3.0); removed VyOS 1.3 Equuleus.Nov 6 2021, 11:24 AM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.3); removed VyOS 1.3 Equuleus (1.3.0).Aug 29 2022, 7:05 AM
m1nus mentioned this in T4891: BFD flapping loop.Dec 23 2022, 1:22 PM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.4); removed VyOS 1.3 Equuleus (1.3.3).Jul 12 2023, 9:41 PM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.5); removed VyOS 1.3 Equuleus (1.3.4).Aug 25 2023, 9:30 PM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.6); removed VyOS 1.3 Equuleus (1.3.5).Dec 17 2023, 11:37 PM
dmbaturin triaged this task as High priority.Jan 9 2024, 4:55 PM
dmbaturin added a project: VyOS 1.4 Sagitta.
Viacheslav changed the task status from Open to Needs testing.Jan 15 2024, 6:33 PM
Viacheslav assigned this task to a.hajiyev.
syncer edited projects, added VyOS 1.3 Equuleus (1.3.7); removed VyOS 1.3 Equuleus (1.3.6).Feb 10 2024, 9:17 AM
Viacheslav subscribed.Apr 18 2024, 11:06 AM

@kroy can you re-test this case?

Viacheslav changed the task status from Needs testing to Needs reporter action.Apr 18 2024, 11:06 AM
syncer edited projects, added VyOS 1.4 Sagitta (1.4.0-GA); removed VyOS 1.4 Sagitta.May 7 2024, 8:02 AM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.8); removed VyOS 1.3 Equuleus (1.3.7).May 13 2024, 7:32 PM
dmbaturin edited projects, added VyOS 1.3 Equuleus (1.3.9); removed VyOS 1.3 Equuleus (1.3.8).Jun 20 2024, 10:17 AM
dmbaturin edited projects, added VyOS 1.4 Sagitta (1.4.1); removed VyOS 1.3 Equuleus (1.3.9), VyOS 1.4 Sagitta (1.4.0-GA).Jul 2 2024, 7:28 PM
dmbaturin added a project: Bugs.Sep 15 2024, 5:03 PM
syncer added a subscriber: Global Notifications.Nov 1 2024, 9:16 PM
dmbaturin edited projects, added VyOS 1.4 Sagitta (1.4.2); removed Bugs, VyOS 1.4 Sagitta (1.4.1).Dec 3 2024, 4:34 PM
dmbaturin reassigned this task from a.hajiyev to natali-rs1985.Jan 23 2025, 4:07 PM
dmbaturin added projects: VyOS Rolling, VyOS 1.5 Circinus.
dmbaturin added a subscriber: a.hajiyev.
natali-rs1985 added a comment.Jan 24 2025, 1:58 PM

Tested in VyOS 1.4.1:

set interfaces ethernet eth0 address '10.0.10.1/24'

set protocols bfd peer 10.0.10.11 source address '10.0.10.1'
set protocols bfd peer 10.0.10.12 source address '10.0.10.1'

set protocols bgp neighbor 10.0.10.11 address-family ipv4-unicast
set protocols bgp neighbor 10.0.10.11 bfd
set protocols bgp neighbor 10.0.10.11 remote-as '65002'
set protocols bgp system-as '65001'

set protocols bgp neighbor 10.0.10.12 address-family ipv4-unicast
set protocols bgp neighbor 10.0.10.12 bfd
set protocols bgp neighbor 10.0.10.12 remote-as '65002'

vyos@vyos# run show bfd peers
BFD Peers:
        peer 10.0.10.11 vrf default
                ID: 1185970066
                Remote ID: 3173933257
                Active mode
                Status: up
                Uptime: 23 minute(s), 24 second(s)
                Diagnostics: ok
                Remote diagnostics: ok
                Peer Type: configured
                RTT min/avg/max: 0/0/0 usec
                Local timers:
                        Detect-multiplier: 3
                        Receive interval: 300ms
                        Transmission interval: 300ms
                        Echo receive interval: 50ms
                        Echo transmission interval: disabled
                Remote timers:
                        Detect-multiplier: 3
                        Receive interval: 300ms
                        Transmission interval: 300ms
                        Echo receive interval: 50ms

        peer 10.0.10.12 vrf default
                ID: 4073700334
                Remote ID: 2039101274
                Active mode
                Status: up
                Uptime: 23 minute(s), 24 second(s)
                Diagnostics: ok
                Remote diagnostics: ok
                Peer Type: configured
                RTT min/avg/max: 0/0/0 usec
                Local timers:
                        Detect-multiplier: 3
                        Receive interval: 300ms
                        Transmission interval: 300ms
                        Echo receive interval: 50ms
                        Echo transmission interval: disabled
                Remote timers:
                        Detect-multiplier: 3
                        Receive interval: 300ms
                        Transmission interval: 300ms
                        Echo receive interval: 50ms

Tested many times to shutdown and connect peers. Works good

dmbaturin closed this task as Not Applicable.Jan 24 2025, 3:37 PM
dmbaturin removed projects: VyOS 1.5 Circinus, VyOS Rolling, VyOS 1.4 Sagitta (1.4.2).
dmbaturin changed Is it a breaking change? from Unspecified (possibly destroys the router) to Perfectly compatible.