3750CORE_A#sh run
Building configuration...
Current configuration : 2948 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
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hostname 3750CORE_A
!
!
username admin privilege 15 password 7
no aaa new-model
switch 1 provision ws-c3750g-24ps
system mtu routing 1500
ip subnet-zero
ip routing
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
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vlan internal allocation policy ascendi
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interface GigabitEthernet1/0/1
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/2
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast trunk
no shutdown
!
interface GigabitEthernet1/0/3
switchport access vlan 10
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/4
switchport access vlan 10
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/5
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/6
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/7
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/8
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/9
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/10
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/11
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/12
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/13
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast trunk
!
interface GigabitEthernet1/0/14
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast trunk
!
interface GigabitEthernet1/0/15
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast trunk
!
interface GigabitEthernet1/0/16
!
interface GigabitEthernet1/0/17
switchport access vlan 20
!
interface GigabitEthernet1/0/18
switchport access vlan 20
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interface GigabitEthernet1/0/19
switchport access vlan 20
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interface GigabitEthernet1/0/20
switchport access vlan 20
!
interface GigabitEthernet1/0/21
!
interface GigabitEthernet1/0/22
!
interface GigabitEthernet1/0/23
!
interface GigabitEthernet1/0/24
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast trunk
!
interface GigabitEthernet1/0/25
!
interface GigabitEthernet1/0/26
!
!
interface GigabitEthernet1/0/27
!
interface GigabitEthernet1/0/28
!
interface Vlan1
ip address 192.168.146.212 255.255.255.0
standby 2 ip 192.168.146.211
standby 2 timers 5 15
standby 2 preempt
!
interface Vlan10
ip address 192.168.156.212 255.255.255.0
standby 3 ip 192.168.156.211
standby 3 timers 5 15
standby 3 preempt
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ip classless
ip route 0.0.0.0 0.0.0.0 192.168.146.150
ip http server
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!
control-plane
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line con 0
password 7 070E25414707
line vty 0 4
password 7 14161606050A
login
length 0
line vty 5 15
login
!
end
if it is enabled try using the VLAN 10 ip address as the gateway for the VOICE servers.
also try pinging the remote PC's from the 3750, and try a trace and see where it fails (from 3750 command prompt: trace remoteip)