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Frequent ISIS Adjacency State Changes While Link Remains Physically Up

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TitleFrequent ISIS Adjacency State Changes While Link Remains Physically Up
Symptoms
  • NNI connected ERS 4850GTS-PWR+ lost ISIS adjacency to its respective pair of VSP 8284XSQ switches for approximately 15 minutes
  • All ports involved have remained physically up for last 116 days
  • CPU utilization at normal levels on all devices
  • No indications of congestion or packet drops at interface level
  • ERS log events
2020-04-22 13:12:18 GMT-04:00 21429 SPBM detect adj DOWN on unit/port 3/50, neighbor xxxx.xxxx.xxxx
2020-04-22 13:13:31 GMT-04:00 21431 SPBM detect adj INIT on unit/port 3/50, neighbor xxxx.xxxx.xxxx

2020-04-22 13:13:32 GMT-04:00 21432 SPBM detect adj INIT on unit/port 1/50, neighbor yyyy.yyyy.yyyy

2020-04-22 13:13:32 GMT-04:00 21433 SPBM detect adj UP on unit/port 3/50, neighbor xxxx.xxxx.xxxx
2020-04-22 13:13:32 GMT-04:00 21434 SPBM detect adj INIT on unit/port 3/50, neighbor xxxx.xxxx.xxxx
2020-04-22 13:13:37 GMT-04:00 21437 SPBM detect adj UP on unit/port 3/50, neighbor xxxx.xxxx.xxxx

2020-04-22 13:13:37 GMT-04:00 21438 SPBM detect adj UP on unit/port 1/50, neighbor yyyy.yyyy.yyyy

2020-04-22 13:16:31 GMT-04:00 21510 SPBM detect adj INIT on unit/port 3/50, neighbor xxxx.xxxx.xxxx

2020-04-22 13:17:34 GMT-04:00 21518 SPBM detect adj INIT on unit/port 1/50, neighbor yyyy.yyyy.yyyy

2020-04-22 13:19:13 GMT-04:00 21531 SPBM detect adj UP on unit/port 3/50, neighbor xxxx.xxxx.xxxx
2020-04-22 13:19:13 GMT-04:00 21532 SPBM detect adj INIT on unit/port 3/50, neighbor xxxx.xxxx.xxxx

2020-04-22 13:19:13 GMT-04:00 21533 SPBM detect adj UP on unit/port 1/50, neighbor yyyy.yyyy.yyyy
  • Log events from VSP pair
2020-04-22T13:12:39.834-04:00 VSP_A CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:13:36.342-04:00 VSP_A CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:14:02.826-04:00 VSP_A CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:19:11.844-04:00 VSP_A CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:19:38.895-04:00 VSP_A CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:26:57.611-04:00 VSP_A CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)

2020-04-22T13:12:43.297-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:13:31.897-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj INIT on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:13:31.898-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:14:02.290-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:17:34.391-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:18:01.283-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:19:12.918-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:19:40.312-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:22:59.964-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:23:26.292-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj DOWN on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)
2020-04-22T13:26:58.684-04:00 VSP_B CP1 - 0x00004726 - 00000000 GlobalRouter SNMP INFO SPBM detected adj UP on Port1/7 , neighbor zzzz.zzzz.zzzz (ERS)


 
Environment
  • ERS 4800
  • Release 5.12.1.027
  • VSP 8284XSQ
  • Release 6.1.4.0
Cause
External devices with firewall connected to the stacks were sending PDU storms
Resolution
External device was isolated and ISIS adjacencies stabilized
Additional notes
VLACP not configured on ports involved

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