Native VLAN Mismatch while doing intervlan routing

[nor]

I am trying to configure a banking enterprise network. Just started. So, I put a switch in each department. A specific vlan for each. I have configured the layer 3 switch ports with vlan 10 and vlan 20. and given them ip addresses as well. And I am able to ping from vlan 10 to 20. However, I get native vlan mismatch error on both the switches and I cant seem to figure out how to fix it. Am I trying to do this wrong, or am I just missing a simple command?

Let me know if i should provide more information..

[Elliot Dierksen]

Please show the interface configuration from both the edge switches and the interface on the switch where they are uplinked. Are they configured as trunks? Is there a "switchport trunk native vlan X" on the trunk port? If it is a trunk, the native (untagged) vlan must the same on each side of the link.

[nor]

i have attached the file and replied to the person above as well. I dont know where to put native vlan since I configured layer 3 switch ports as access ports for the vlans.

[Jon Marshall]

As already requested please attach the configuration files of the switches not just a Packet Tracer file. 

Jon

[paul.driver]

Hello

Are your ports designated to tbe trunk or access ports on both sides of the switch interconnect, if you do not specify an administrative mode then by default they are dynamic ports with trunking enabled, so they really need to be the same on both ends of the connection.

Also on the Multilayer switch have you created the L2 vlans for the L3 svis and are these vlans also applied on the access switch's?

sh inter fa0/X switchport 
sh vlan brief

Example:
ML sw and access switch:
conf t
vlan 10
exit

int fa0/1
switchport access vlan 10
switchport mode access

[paul driver]

Hello

Are your ports designated to tbe trunk or access ports on both sides of the switch interconnect, if you do not specify an administrative mode then by default they are dynamic ports with trunking enabled, so they really need to be the same on both ends of the connection.

Also on the Multilayer switch have you created the L2 vlans for the L3 svis and are these vlans also applied on the access switch's?

sh inter fa0/X switchport 
sh vlan brief

Example:
ML sw and access switch:
conf t
vlan 10
exit

int fa0/1
switchport access vlan 10
switchport mode access