One of our NorthernLights Gigapop routers that has BFD configured also had the neighbors bounce. Our other router doesn't have BFD configured and has stayed up. Perhaps some delay with the route server sending BFD packets?

RP/0/RP0/CPU0:Sep 7 11:46:16.328 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 206.108.255.2 Down - BFD (Bidirectional forwarding detection) session down (VRF: default; AFI/SAFI: 1/1) (AS: 53679)
RP/0/RP1/CPU0:Sep 7 11:46:16.330 CDT: bgp[1088]: %ROUTING-BGP-5-NBR_NSR_DISABLED_STANDBY : NSR disabled on neighbor 206.108.255.2 on standby RP due to BFD (Bidirectional forwarding detection) session down (VRF: default)
RP/0/RP0/CPU0:Sep 7 11:46:16.545 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 2001:504:27::d1af:0:2 Down - BFD (Bidirectional forwarding detection) session down (VRF: default; AFI/SAFI: 2/1) (AS: 53679)
RP/0/RP1/CPU0:Sep 7 11:46:16.548 CDT: bgp[1088]: %ROUTING-BGP-5-NBR_NSR_DISABLED_STANDBY : NSR disabled on neighbor 2001:504:27::d1af:0:2 on standby RP due to BFD (Bidirectional forwarding detection) session down (VRF: default)
RP/0/RP0/CPU0:Sep 7 11:47:24.925 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 2001:504:27::d1af:0:2 Up (VRF: default; AFI/SAFI: 2/1) (AS: 53679)
RP/0/RP0/CPU0:Sep 7 11:47:28.850 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 206.108.255.2 Up (VRF: default; AFI/SAFI: 1/1) (AS: 53679)
RP/0/RP0/CPU0:Sep 8 07:29:45.568 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 206.108.255.2 Down - BFD (Bidirectional forwarding detection) session down (VRF: default; AFI/SAFI: 1/1) (AS: 53679)
RP/0/RP1/CPU0:Sep 8 07:29:45.564 CDT: bgp[1088]: %ROUTING-BGP-5-NBR_NSR_DISABLED_STANDBY : NSR disabled on neighbor 206.108.255.2 on standby RP due to BFD (Bidirectional forwarding detection) session down (VRF: default)
RP/0/RP0/CPU0:Sep 8 07:29:45.637 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 2001:504:27::d1af:0:2 Down - BFD (Bidirectional forwarding detection) session down (VRF: default; AFI/SAFI: 2/1) (AS: 53679)
RP/0/RP1/CPU0:Sep 8 07:29:45.633 CDT: bgp[1088]: %ROUTING-BGP-5-NBR_NSR_DISABLED_STANDBY : NSR disabled on neighbor 2001:504:27::d1af:0:2 on standby RP due to BFD (Bidirectional forwarding detection) session down (VRF: default)
RP/0/RP0/CPU0:Sep 8 07:30:45.038 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 206.108.255.2 Up (VRF: default; AFI/SAFI: 1/1) (AS: 53679)
RP/0/RP0/CPU0:Sep 8 07:31:04.707 CDT: bgp[1088]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 2001:504:27::d1af:0:2 Up (VRF: default; AFI/SAFI: 2/1) (AS: 53679)

Thanks,

Colin Murphy
Sr. Network Engineer
Office of Information Technology
University of Minnesota
Northern Lights Gigapop
Desk: 612-626-0870

On Fri, Sep 8, 2023 at 1:19 PM Jay Hanke <[log in to unmask]> wrote:

Looking solid to both RS. This comes in via MN VoIP not via the SFN remote switch.

jayhanke@SFN-IA-Davenport-BDR4> show bgp summary | grep 53679
206.108.255.1 53679 4568167 259883 0 4 12w1d 12:45:36 1079/114642/114642/0 0/0/0/0
206.108.255.2 53679 4505457 256891 0 2 12w0d 13:07:26 62/114624/114624/0 0/0/0/0
2001:504:27::d1af:0:1 53679 3200405 259714 0 4 12w1d 12:45:40 Establ
2001:504:27::d1af:0:2 53679 3107665 256724 0 2 12w0d 13:07:10 Establ

Note we're not running BFD.

On Fri, Sep 8, 2023 at 1:13 PM Tom Krenn <[log in to unmask]> wrote:

Hi all,

Anyone else noticing the route server at 206.108.255.2 / 2001:504:27::d1af:0:2 dropping out for a second or so the last few days? I’m seeing similar from both of my routers.

LC/0/0/CPU0:Sep 8 07:29:45.717 CDT: bfd_agent[173]: %L2-BFD-6-SESSION_STATE_DOWN : BFD session to neighbor 2001:504:27::d1af:0:2 on interface HundredGigE0/0/0/20 has gone down. Reason: Control timer expired

RP/0/RSP0/CPU0:Sep 8 07:29:45.718 CDT: bgp[1065]: %ROUTING-BGP-5-ADJCHANGE : neighbor 2001:504:27::d1af:0:2 Down - BFD (Bidirectional forwarding detection) session down (VRF: default) (AS: 53679)

LC/0/0/CPU0:Sep 8 07:29:45.795 CDT: bfd_agent[173]: %L2-BFD-6-SESSION_STATE_DOWN : BFD session to neighbor 206.108.255.2 on interface HundredGigE0/0/0/20 has gone down. Reason: Control timer expired

RP/0/RSP0/CPU0:Sep 8 07:29:45.797 CDT: bgp[1065]: %ROUTING-BGP-5-ADJCHANGE : neighbor 206.108.255.2 Down - BFD (Bidirectional forwarding detection) session down (VRF: default) (AS: 53679)

LC/0/0/CPU0:Sep 8 07:29:50.384 CDT: bfd_agent[173]: %L2-BFD-6-SESSION_STATE_UP : BFD session to neighbor 2001:504:27::d1af:0:2 on interface HundredGigE0/0/0/20 is up

LC/0/0/CPU0:Sep 8 07:29:50.384 CDT: bfd_agent[173]: %L2-BFD-6-SESSION_STATE_UP : BFD session to neighbor 206.108.255.2 on interface HundredGigE0/0/0/20 is up

RP/0/RSP0/CPU0:Sep 8 07:30:58.517 CDT: bgp[1065]: %ROUTING-BGP-5-ADJCHANGE : neighbor 206.108.255.2 Up (VRF: default) (AS: 53679)

RP/0/RSP0/CPU0:Sep 8 07:31:01.850 CDT: bgp[1065]: %ROUTING-BGP-5-ADJCHANGE : neighbor 2001:504:27::d1af:0:2 Up (VRF: default) (AS: 53679)

Tom Krenn

Network Architect

Enterprise Architecture - Information Technology

Office: 612-596-8994
[log in to unmask] | hennepin.us

Hennepin County Government Center
300 South 6th Street, A-190
Minneapolis, MN, 55487

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