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Spanning Tree (STP) (Features (UplinkFast (Protects against direct…
Spanning Tree (STP)
Features
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BackboneFast
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BBFast: If BPDUs received on blocked port, skip max age
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RSTP (802.1w)
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Bypass BLK, LIS, LRN phases for faster convergence
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UDLD
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If keep-alive not received, err-disable the port
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Configuration
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#spanning-tree mst configuration
(config-mst)#name test
(config-mst)#revision 1
(config-mst)#instance 1 vlan 1-3
(config-mst)#instance 2 vlan 4-6
#spanning-tree mode mst
#spanning-tree vlan 1-3 root primary
#spanning-tree mst 2 root primary
#spanning-tree mst 1 root secondary
- Find Best Path to Root
(Root Port)
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Best Practices
- Use PVRST or MST
- Choose root and backup wisely
- BPDUGuard on all access ports
- RootGuard on downlinks on core/distros
- Do not exceed seven daisy-chained switches
- No VTP
- Don't disable STP