Difference between revisions of "Spanning tree configuration for Cisco switches"
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[[Main Page|Home]] > [[Switch configuration notes]] > [[Spanning tree configuration for Cisco switches]] | |||
*Configure layer 3 switches as STP root | *Configure layer 3 switches as STP root | ||
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[[Main Page|Home]] > [[Switch configuration notes]] > [[Spanning tree configuration for Cisco switches]] | |||
Latest revision as of 02:41, 28 March 2022
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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