Spanning tree configuration for Cisco switches

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Home > Switch configuration notes > Spanning tree configuration for Cisco switches

  • Configure layer 3 switches as STP root
    Go to global configuration mode and use 'spanning-tree vlan <vlan_id> root primary'. Do this only for VLANs created in that switch (That is VLANs shown when you use 'show run')
  • Configure user ports on 2912-2924 switch with portfast and bpdufilter
    Use following commands for each interface
    'spanning-tree portfast'
    'spanning-tree bpdufilter enable'
  • Configure user ports on 2950+ switches with portfast, bpdufilter and bpduguard
    'spanning-tree portfast'
    'spanning-tree bpdufilter enable'
    'spanning-tree bpduguard enable'
  • Configure 2950+ switches to automatically recover from bpduguard after some fixed interval. That is, in global configuration mode use
    'errdisable detect cause bpduguard'
    'errdisable recovery interval 300'
    (Note: By default settings are same as being configured by above lines. Hence above lines will not appear in 'show run')


Note: Here by user ports we mean all ports in access mode.


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