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Cisco Bug: CSCvt68789 - ISIS Adj flap notification was not shown in ios_msg even when log adjacency changes is configured

Last Modified

Apr 20, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.4.2.BASE

Description (partial)

Symptom:
To debug the reasons why ISIS Adj flap notification was not shown in ios_msg aka syslog

Conditions:
To debug the reasons why ISIS Adj flap notification was not shown in ios_msg aka syslog 

Mar 31 00:26:56 frki02-p-c2 7597836: RP/0/RP0/CPU0:2020 Mar 31 00:26:50.581 UTC: te_control[1065]: %ROUTING-MPLS_TE-5-FRR_STATE : tunnel-te206 source 63.130.117.214 (signalled-name: A0:PRAI05-PE-L2:TPEN01-PE-L1::dyn, LSP Id: 32656, Dest: 63.130.117.40) FRR state changed to Unprotected.

00:26:50.585  WARN01-PE-L2    Te0/1/0/3          u -> d  BFD session DOWN
                                                         IPv4 Unicast Down  
00:26:50.701  WARN01-PE-L2    Te0/1/0/3          d -> i
00:26:50.728  WARN01-PE-L2    Te0/1/0/3          i -> u  New adjacency

And there is no seq number broken as below

Mar 31 00:26:56 frki02-p-c2 7597832: RP/0/RP0/CPU0:2020 Mar 31 00:26:50.581 UTC: te_control[1065]:
Mar 31 00:26:56 frki02-p-c2 7597834: RP/0/RP0/CPU0:2020 Mar 31 00:26:50.581 UTC: te_control[1065]:
Mar 31 00:26:56 frki02-p-c2 7597836: RP/0/RP0/CPU0:2020 Mar 31 00:26:50.581 UTC: te_control[1065]:
Mar 31 00:26:56 frki02-p-c2 7597838: RP/0/RP0/CPU0:2020 Mar 31 00:26:51.306 UTC: te_control[1065]:
Mar 31 00:26:56 frki02-p-c2 7597840: RP/0/RP0/CPU0:2020 Mar 31 00:26:51.307 UTC: te_control[1065]:
Mar 31 00:26:56 frki02-p-c2 7597842: RP/0/RP0/CPU0:2020 Mar 31 00:26:51.307 UTC: te_control[1065]:
Mar 31 00:26:56 frki02-p-c2 7597844: RP/0/RP0/CPU0:2020 Mar 31 00:26:51.307 UTC: te_control[1065]:

rest of the details in the thread attached
                                                         IPv4 Unicast Up 

Mar 31 00:26:56 frki02-p-c2 7597838: RP/0/RP0/CPU0:2020 Mar 31 00:26:51.306 UTC: te_control[1065]: %ROUTING-MPLS_TE-5-FRR_STATE : tunnel-te100 source 63.130.100.114 (signalled-name: A0:MADN09-PE-L1:PTHN01-PE-L1::dyn, LSP Id: 17984, Dest: 63.130.112.10) FRR state changed to FRR-Active, backup tunnel (tunnel-te2027, LSP Id: 159), protection type (link).

Log adjacency changes is configured:

RP/0/RP0/CPU0:FRKI02-P-C2#show run formal router isis | i log
Wed Apr  1 09:32:48.814 UTC
router isis 4445 log adjacency changes
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