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TRAFFIC CONVERGENCE ISSUE||ASR9k

vinayjaiswal
Participant
Participant

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;

4 Replies 4

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

 

what device/model is this on ? Do you have 'channel-group min-link' configured under the port channel ?

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;

 

paul driver
VIP Expert VIP Expert
VIP Expert

Hello
Try disabling BFD on that particular PC and see if the flapping stops, if it does then it may be that your BFD timers are too aggressive towards a link flap also make sure the BFD timers have parity to the other side of that connection.


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Hi Paul,

 

Here issue is not related to Link flapping we had concern that traffic is showing routes from PO12 but it doesn’t have high amount of traffic & when Po12 made shut & no-shut issue got resolved.

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