D1(config)#spanning-tree vlan 101 root ?
  primary    Configure this switch as primary root for this spanning tree
  secondary  Configure switch as secondary root
D1(config)#spanning-tree vlan 101 root secondary
D1(config)#do show run
Building configuration...

Current configuration : 2803 bytes
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version 16.3.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
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hostname D1
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no ip cef
ip routing
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ipv6 unicast-routing
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no ipv6 cef
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no ip domain-lookup
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spanning-tree mode rapid-pvst
spanning-tree vlan 100,102 priority 24576
spanning-tree vlan 101 priority 28672
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interface Port-channel12
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interface GigabitEthernet1/0/1
 switchport trunk native vlan 999
 channel-group 12 mode active
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interface GigabitEthernet1/0/2
 switchport trunk native vlan 999
 channel-group 12 mode active
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interface GigabitEthernet1/0/3
 switchport trunk native vlan 999
 channel-group 12 mode active
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interface GigabitEthernet1/0/4
 switchport trunk native vlan 999
 channel-group 12 mode active
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interface GigabitEthernet1/0/5
 switchport trunk native vlan 999
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interface GigabitEthernet1/0/6
 switchport trunk native vlan 999
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interface GigabitEthernet1/0/7
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interface GigabitEthernet1/0/8
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interface GigabitEthernet1/0/9
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interface GigabitEthernet1/0/10
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interface GigabitEthernet1/0/11
 description connection to R1
 no switchport
 ip address 10.0.10.2 255.255.255.0
 duplex auto
 speed auto
 ipv6 address FE80::D1:1 link-local
 ipv6 address 2001:DB8:100:1010::2/64
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interface GigabitEthernet1/0/12
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interface GigabitEthernet1/0/13
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interface GigabitEthernet1/0/14
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interface GigabitEthernet1/0/15
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interface GigabitEthernet1/0/16
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interface GigabitEthernet1/0/17
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interface GigabitEthernet1/0/18
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interface GigabitEthernet1/0/19
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interface GigabitEthernet1/0/20
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interface GigabitEthernet1/0/21
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interface GigabitEthernet1/0/22
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interface GigabitEthernet1/0/23
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interface GigabitEthernet1/0/24
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interface GigabitEthernet1/1/1
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interface GigabitEthernet1/1/2
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interface GigabitEthernet1/1/3
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interface GigabitEthernet1/1/4
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interface Vlan1
 no ip address
 shutdown
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interface Vlan100
 mac-address 0001.43aa.1b01
 ip address 10.0.100.1 255.255.255.0
 ipv6 address FE80::D1:2 link-local
 ipv6 address 2001:DB8:100:100::1/64
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interface Vlan101
 mac-address 0001.43aa.1b02
 ip address 10.0.101.1 255.255.255.0
 ipv6 address FE80::D1:3 link-local
 ipv6 address 2001:DB8:100:101::1/64
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interface Vlan102
 mac-address 0001.43aa.1b03
 ip address 10.0.102.1 255.255.255.0
 ipv6 address FE80::D1:4 link-local
 ipv6 address 2001:DB8:100:102::1/64
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router ospf 4
 router-id 0.0.4.131
 log-adjacency-changes
 passive-interface default
 no passive-interface GigabitEthernet1/0/11
 no passive-interface Port-channel12
 network 10.0.10.0 0.0.0.255 area 0
 network 10.0.100.0 0.0.0.255 area 0
 network 10.0.101.0 0.0.0.255 area 0
 network 10.0.102.0 0.0.0.255 area 0
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ip classless
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ip flow-export version 9
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line con 0
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line aux 0
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line vty 0 4
 login
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end


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D1(config)