Hello Georg,
have you configured 'channel-group min-link' under the port channel? No showrun Po12 shared below.
MODEL-ASR903
TNCHNPERNER03#show run int Po12
Building configuration...
Current configuration : 513 bytes
!
interface Port-channel12
description CHN-CHN;TNCHNPERNER03;TNCHNPERNER04;A1;010000M;XXXXXXXXXXXXXXXXXXXX;Port-channel12;Port-channel12;
dampening
mtu 9192
ip address 10.163.22.5 255.255.255.252
no ip proxy-arp
ip ospf authentication key-chain IDEA
ip ospf network point-to-point
ip ospf bfd
ip ospf 100 area 0.0.0.0
load-interval 30
carrier-delay up msec 200
carrier-delay down msec 500
shutdown
mpls ip
mpls traffic-eng tunnels
mpls traffic-eng attribute-flags 0x100000
bfd template IDEA
end
Observation.
We observed one link between TNCHNPERNER03 to KKBNGBTPNCR02 has flapped at the same time observed route flapped between source to destination.
We observed destination Ip is taking path via Po12 but observed less traffic , for now we have shut the Po12 and outage got restored.
Link flapped observed :
TNCHNPERNER03 to BNG-CHN;KKBNGBTPNCR02;TNCHNPERNER03;W1;020000M;NBGLCHNNG4XXXXXXXH01;Bundle-Ether18;Port-channel16;
9367778: .May 7 13:15:35.646 ist: %OSPF-5-ADJCHG: Process 100, Nbr 10.160.7.238 on Port-channel16 from LOADING to FULL, Loading Done
9367779: .May 7 13:15:35.646 ist: %BFD-6-BFD_SESS_CREATED: BFD-SYSLOG: bfd_session_created, neigh 10.163.22.1 proc:OSPF, idb:Port-channel16 handle:7 act
9374621: .May 7 14:13:39.577 ist: %EC-5-MINLINKS_NOTMET: Port-channel Port-channel16 is down bundled ports (0) doesn't meet min-links
9374765: .May 7 14:13:40.108 ist: %LINK-3-UPDOWN: Interface Port-channel16, changed state to down
9374829: .May 7 14:13:40.171 ist: %IFDAMP-5-UPDOWN: interface Port-channel16 update IP Routing state to DOWN, interface is not suppressed
9374830: .May 7 14:13:40.171 ist: %OSPF-5-ADJCHG: Process 100, Nbr 10.160.7.238 on Port-channel16 from FULL to DOWN, Neighbor Down: Interface down or detached
9375226: .May 7 14:13:40.908 ist: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel16, changed state to down
9375895: .May 7 14:13:44.804 ist: %LINK-3-UPDOWN: Interface Port-channel16, changed state to up
9375896: .May 7 14:13:44.828 ist: %IFDAMP-5-UPDOWN: interface Port-channel16 update IP Routing state to UP, interface is not suppressed
9375916: .May 7 14:13:45.546 ist: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel16, changed state to up
9376031: .May 7 14:13:54.899 ist: %OSPF-5-ADJCHG: Process 100, Nbr 10.160.7.238 on Port-channel16 from LOADING to FULL, Loading Done
9376032: .May 7 14:13:54.899 ist: %BFD-6-BFD_SESS_CREATED: BFD-SYSLOG: bfd_session_created, neigh 10.163.22.1 proc:OSPF, idb:Port-channel16 handle:7 act
9379075: .May 7 14:38:22.663 ist: %EC-5-MINLINKS_NOTMET: Port-channel Port-channel16 is down bundled ports (0) doesn't meet min-links
9379078: .May 7 14:38:23.166 ist: %LINK-3-UPDOWN: Interface Port-channel16, changed state to down
9379079: .May 7 14:38:23.176 ist: %IFDAMP-5-UPDOWN: interface Port-channel16 update IP Routing state to DOWN, interface is not suppressed
9379080: .May 7 14:38:23.176 ist: %OSPF-5-ADJCHG: Process 100, Nbr 10.160.7.238 on Port-channel16 from FULL to DOWN, Neighbor Down: Interface down or detached
9379510: .May 7 14:38:24.007 ist: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel16, changed state to down
9380137: .May 7 14:38:27.726 ist: %LINK-3-UPDOWN: Interface Port-channel16, changed state to up
9380138: .May 7 14:38:27.740 ist: %IFDAMP-5-UPDOWN: interface Port-channel16 update IP Routing state to UP, interface is not suppressed
9380191: .May 7 14:38:28.461 ist: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel16, changed state to up
9380285: .May 7 14:38:38.850 ist: %OSPF-5-ADJCHG: Process 100, Nbr 10.160.7.238 on Port-channel16 from LOADING to FULL, Loading Done
9380286: .May 7 14:38:38.850 ist: %BFD-6-BFD_SESS_CREATED: BFD-SYSLOG: bfd_session_created, neigh 10.163.22.1 proc:OSPF, idb:Port-channel16 handle:7 act
Link made Down:
TNCHNPERNER03 to CHN-CHN;TNCHNPERNER03;TNCHNPERNER04;A1;010000M;XXXXXXXXXXXXXXXXXXXX;Port-channel12;Port-channel12;
