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Community Member

what does this log mean?

4263: 8w0d: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to down

4 REPLIES
Cisco Employee

Re: what does this log mean?

Means device connected to fa 0/6 sent a link down signal to the switch. This is normal if the device connected to fa 0/6 was disconnected or rebooted.

PS: Remember to rate useful posts.

Community Member

Re: what does this log mean?

2006 Mar 24 14:11:34 utc +08:00 %CDP-4-NVLANMISMATCH:Native vlan mismatch detected

what about this?warning

Re: what does this log mean?

Hi,

CDP is generating that message and there is a native vlan mismatch found on the port. Native vlan is a vlan whose frames are sent as untagged. By default the native vlan is 1 on the cisco switches.

If someone has changed the native vlan to something else on one side of the link then you will get this kind of message. Now to check the native vlan on the port, use command " show interface x/y switchport ".

To change the native vlan on the switchport

conf t

int fa x/y

switchport native vlan

Or you can simply disable the CDP on the port and it will not log you that message.

conf t

int fa x/y

no cdp enable

HTH, Please rate if it does.

-amit singh

Community Member

Re: what does this log mean?

well each switch has a native vlan assigned to it with the Cisco default being 1.

Somehow either by you or someone else with access (or you installed a grey market switch that didnt have the defaults reset to it.) The default vlan was changed on this switch or an adjoining cisco switch. This would be seen by CDP CDP is proprietary cisco (Cisco Discovery Protocol))and unless specified by a 'no cdp' command on a switchport all cisco switches will look out all ports (maybe just all trunk ports Ill have to look that up) looking for CDP peers and if they see another peer with a different default vlan it will give this error. To correct this either change the default vlan on the offending switch or do a no cdp on the port that the offending switch connects to on this switch.

Please rate this post if it helps :)

-WM

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