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How to Configure Spanning Tree root bridge


How to Configure Spanning Tree root bridge


Hi Today we going to talk about how to configure STP Root bridge, Root bridge election is happening with the switchers in the network, To become a root there should be some qualification among switchers, they are,
  • bridge priority
  • Lowest MAC 
default bridge priority is 32769  this is tie among switchers then root elect using lowest MAC

to change default root configure switch like below

Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#
Switch(config)#
Switch(config)#
Switch(config)#
Switch(config)#
Switch(config)#
Switch(config)#sp
Switch(config)#spanning-tree vl
Switch(config)#spanning-tree vlan 1 ?
priority Set the bridge priority for the spanning tree
root Configure switch as root
<cr>
Switch(config)#spanning-tree vlan 1 ro
Switch(config)#spanning-tree vlan 1 root ?
primary Configure this switch as primary root for this spanning tree
secondary Configure switch as secondary root
Switch(config)#spanning-tree vlan 1 root p
Switch(config)#spanning-tree vlan 1 root primary ?
<cr>
Switch(config)#spanning-tree vlan 1 root primary
Switch(config)#

for more details please refer this video


Happy Learning !!!!
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