cdp 4 native vlan mismatch

[suvasish]

Respected All,

I want to know the meaning of the "4" in the message. I am aware of the meaning of the above notification.

Thanks and regards,

Suvasish Nag

[balaji.bandi]

You need to provide full log, we can not assumre here what log you looking ?

if you looking "cdp 4 native vlan mismatch"

here is the good reference :

https://community.cisco.com/t5/networking-documents/frequent-cdp-4-nvlanmismatch-or-cdp-4-native-vlan-mismatch/ta-p/3130899

[amikat]

Hi,

The number indicates severity of the condition. The lower the number, the more serious the situation.

"4" stands for WARNING.

Best regards,

Antonin

[Deepak Kumar]

Hi,

First of all, We need a full log message to provide better suggestions. But based on this massage there will two main reasons

1. Native VLAN mismatch on trunk port:  If trunk port is not configured properly and VLAN mismatch has been configured then you will this type of massage as an example:

Switches configuration:

Switch01:
interface gig0/0
switchport mode trunk
switchport trunk native vlan 2

Switch02:
interface gig0/0
switchport mode trunk
switchport trunk native vlan 3 ---------> Native VLAN mistach 

Make it correct as:

Switch01:
interface gig0/0
switchport mode trunk
switchport trunk native vlan 2

Switch02:
interface gig0/0
switchport mode trunk
switchport trunk native vlan 2

2. If both switches are running on different CDP version. Check the CDP version with "Show CDP" command on both switches.