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Native Vlan Missmatch message

Hi All,

I am connecting 2950 switch port to 6505 switch port, both ports are in trunking mode and allowing only one vlan on the both.

On 6505 switch I set as follows:-

enable> set trunk 2/23 700

enable> set trunk 2/23 nonegotiate dot1q.

On 2950 I set it as follows:

(conf)int f0/23

switchport mode trunk

switchport trunk Native vlan 700

switchport nonegotiate.

when I issue the show logging, I noticed the (Native Vlan missmatch).

when I chang the switch port config on 2950 to the following it doesn't work:-

int f0/23

switchport mode trunk

switchport trunk allowed vlan 700

switchport nonegotiate

when I did the above, the traffic is discarded and subnets 0n the Core 6505 couldn't access subnets on their remote locations.

Could any body tell me the reason of that, and why I am getting Native Message? as well as why it works only if I set 2950 swith port to (trunk Native vlan ,,,, or ,,,, access mode).

thanks...

3 REPLIES

Re: Native Vlan Missmatch message

Hi

U getting this message due to the mismatch of native vlan on the trunking ports.as on 2950 the native vlan will be vlan1 trying changing the native vlan on 2950 by using this command

switchport mode trunk

switchport trunk allowed vlan 700

switchport trunk native vlan 700

hope this helps

Thanks

Mahmood

Re: Native Vlan Missmatch message

Hi Friend,

On cat6k though you have configured it as trunk and allowed only vlan 700 but still the native vlan is 1 by default.

And you have configured on 2950 native vlan as 700.

So what I will suggest you is to change the native vlan on cat6k switch also to vlan 700

How you can do this on catos is

set vlan 700 2/23

Now what this will do is on cat6k it will make vlan 700 as native on trunk and you can keep the conig on 2950 same

(conf)int f0/23

switchport mode trunk

switchport trunk Native vlan 700

switchport nonegotiate.

or if you just waan a get rid of the error message and keep the config as it was earlier you can also disable CDP on the interface level.

HTH, if yes please rate the post.

Ankur

Re: Native Vlan Missmatch message

You have only added trunk on 2/23 but still the native vlan is 1 and on 2950 you have added the native vlan 700, that's why you are getting that message.

Set the native vlan to 1 on 6500 using command:

set vlan 700 2/23

your configuration on 2950 is correct.

HTH,Please rate if it does.

-amit singh

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