CCNA Notes
CompTIA LX103
Cisco ICND1
Cisco ICND2
- Topics
- To
- Be
- Added
Various
Labs
CompTIA LX103
Cisco ICND1
Cisco ICND2
Various
Labs
This is an old revision of the document!
Frame Loop Prevention Mechanism. Achieved by blocking all but one ROOT port to a ROOT switch. Redundant links are then blocked to create a loop-free environment.
SW1(config)#spanning-tree vlan 1 root primary SW1(config)#spanning-tree vlan 1 root secondary
SW2(config)#spanning-tree vlan 1 priority ? <0-61440> bridge priority in increments of 4096 SW2(config)#spanning-tree vlan 1 priority 4096 Hello Max Fwd Vlan Bridge ID Time Age Dly Protocol ---------------- --------------------------------- ----- --- --- -------- VLAN0001 4097(4096, 1) 0019.e86a.2280 2 20 15 ieee VLAN0002 32770(32768, 2) 0019.e86a.2280 2 20 15 ieee
SW2(config)#int fa0/1 SW2(config-if)#spanning-tree vlan 2 cost 1 SW2(config-if)# SW2(config-if)#do sh spann int fa0/1 Vlan Role Sts Cost Prio.Nbr Type ------------------- ---- --- --------- -------- -------------------------------- VLAN0001 Desg FWD 19 128.1 P2p VLAN0002 Root FWD 1 128.1 P2p <-- NOTICE THE COST! LOWER COST = ROOT PORT!