Trunk connection not working

Hello Experts,
I setup a trunk connection between a cisco switch 4507 and 3750. However, I am not getting any communication between the two switchs.
This is the port on the 4507:

interface GigabitEthernet3/43
 description TRUNK
 switchport trunk encapsulation dot1q
 switchport mode trunk
 service-policy output VoipPolicy

and this is the port on the 3750:

interface GigabitEthernet1/0/48
 description TRUNK
 switchport trunk encapsulation dot1q
 switchport mode trunk

routes on 4507:

ip default-gateway 172.31.14.11
ip route 0.0.0.0 0.0.0.0 172.31.14.11
ip route 192.168.0.0 255.255.255.0 192.168.0.11
ip route 192.168.31.0 255.255.255.192 172.31.14.97

routes on the 3750:

ip default-gateway 172.31.14.11
ip classless
ip route 0.0.0.0 0.0.0.0 172.31.14.11
ip route 172.31.1.0 255.255.255.0 172.20.14.1
ip route 172.31.14.0 255.255.255.0 172.20.14.1
ip route 172.31.15.0 255.255.255.0 172.20.14.1
ip route 172.31.31.0 255.255.255.0 172.20.14.1
ip route 172.31.69.0 255.255.255.0 172.20.14.1
Admin73Asked:
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John MeggersNetwork ArchitectCommented:
How are you determining you don't have communication between the switches?  Do you have VLAN interfaces on both switches in the same VLAN (and subnet) that you could ping between?  Are VLANs up on the switches, and in an active state?  Are the trunk ports up?
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Admin73Author Commented:
Yes the trunk ports are up, I am trying to ping one vlan interface to the other switch but no replies
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Garry GlendownConsulting and Network/Security SpecialistCommented:
did you configure the vlans on the switches? Cisco switches usually ignore VLANs that are unknown locally ...
On the 3750, use either the "vlan database" command, followed by "vlan NUMBER" and "ex" (deprecated, if still available on your IOS version), or use the regular config mode with "vlan NUMBER"
Same on the 4500 ...
Once the VLANs are known, they should work.
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Admin73Author Commented:
All the vlans are configured on both switches and they are known so I don'y think the issue is there
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Garry GlendownConsulting and Network/Security SpecialistCommented:
can you post the configs?
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Admin73Author Commented:
which configs?
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Garry GlendownConsulting and Network/Security SpecialistCommented:
of the two switches ...
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Admin73Author Commented:
Thanks!
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