CISCO two differnet VLAN access from two differnet port in same switch / CDP Native VLAN mismatch

CISCO two differnet VLAN access from two differnet port in same switch and CDP Native VLAN mismatch problem
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Suppose I have a VLAN 50 declared from my network connected by trunk GigabitEthernet0/1
and
another Vendors  VALN 60 declared from vendor  connected by trunk GigabitEthernet0/2

Now I want to access  VLAN 50 with VLAN 60 with the same switch  two port fa0/20 and fa0/21


interface GigabitEthernet0/1
 description From-My-Switch
 switchport trunk allowed vlan 50
 switchport mode trunk
!
interface GigabitEthernet0/2
 description With-Other-Vendor
 switchport trunk allowed vlan 60
 switchport mode trunk
!

interface FastEthernet0/20

 description My-VLAN

 switchport access vlan 50

 switchport mode access

!

interface FastEthernet0/21

 description Vendor-Data-VLAN

 switchport access vlan 60

 switchport mode access

!

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Now  if we montor terminal by

Switch# terminal monitor 

then some error may found like bellow

1w0d: %CDP-4-NATIVE_VLAN_MISMATCH: 

Native VLAN mismatch discovered on FastEthernet0/21 (60), with Switch FastEthernet0/20 (50).

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Switch-tayab# conf t 

Switch-tayab (config)# no cdp run

Switch-tayab (config)#exit

Switch-tayab# wri

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