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titleDebugging STP with MLAG

Running net show <interface> spanning-tree displays MLAG information that can be useful when debugging:

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cumulus@switch:~$ net show bridge spanning-tree
bridge:peerlink CIST info
  enabled            yes                     role                 Designated
  port id            8.002                   state                forwarding
  ..............
  bpdufilter port    no                     
  clag ISL           yes                     clag ISL Oper UP     yes
  clag role          primary                 clag dual conn mac   00:00:00:00:00:00
  clag remote portID F.FFF                   clag system mac      44:38:39:FF:40:90

Best Practices for STP with MLAG:

  • The STP global configuration must be the same on both the switches.
  • The STP configuration for dual-connected ports should be the same on both peer switches.
  • The STP priority must be the same on both peer switches. You set the priority with this command:

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    languagetext
    cumulus@switch:~$ net add bridge stp treeprio PRIORITY_VALUE
    cumulus@switch:~$ net commit
  • Use NCLU (net) commands for all spanning tree configurations, including bridge priority, path cost and so forth. Do not use brctl commands for spanning tree, except for brctl stp on/off, as changes are not reflected to mstpd and can create conflicts.

Troubleshooting

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Viewing the MLAG Log File

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