S1#sh running-config 
Building configuration...

Current configuration : 1586 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
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hostname S1
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enable secret 5 $1$mERr$5.a6P4JqbNiMX01usIfka/
!
!
!
!
!
spanning-tree mode pvst
spanning-tree vlan 1,10 priority 4096
spanning-tree vlan 2-9,11-100 priority 24576
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interface FastEthernet0/1
 switchport trunk allowed vlan 99
 switchport mode trunk
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interface FastEthernet0/2
 switchport trunk allowed vlan 1-100
 switchport mode trunk
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interface FastEthernet0/3
 switchport access vlan 10
 switchport mode access
 spanning-tree portfast
!
interface FastEthernet0/4
 switchport access vlan 20
 switchport mode access
 spanning-tree portfast
!
interface FastEthernet0/5
 switchport access vlan 99
 switchport mode access
 spanning-tree portfast
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interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
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interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
 no ip address
 shutdown
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interface Vlan99
 ip address 172.17.99.2 255.255.255.0
!
!
!
!
line con 0
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line vty 0 4
 password cisco
 login
line vty 5 15
 login
!
!
end