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Switch Not Forming SPB Adjacency

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TitleSwitch Not Forming SPB Adjacency
Symptoms
  • switches do not form SPB adjacency
  • MSTP configDigest does not match
Switch A (su)->show spantree mstcfgid
MST Configuration Identifier:
Format Selector: 0
Configuration Name: spbv1
Revision Level: 0
Configuration Digest: b7:8c:05:df:5c:b8:a2:ff:f8:9c:28:32:71:22:84:c4

Switch B

Switch B (su)->show spb neighbors
Switch B(su)->show spantree mstcfgid
MST Configuration Identifier:
Format Selector: 0
Configuration Name: spbv1
Revision Level: 0
Configuration Digest: 98:e9:a4:85:c9:75:c6:d3:f9:b3:6d:92:7b:09:44:8f
Environment
  • S-series
  • 7100-Series
  • K-Series
Cause
MSTI mapping not identical on both switches
Resolution
MAP the msti identically on all switches
Additional notes

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