12-24-2007 04:55 AM - edited 03-05-2019 08:08 PM
hi ,
Can any one let me know when does Native Vlan mis match issue occurs .
any help on this would be appreciated.
Thanks,
Akber.
12-24-2007 05:26 AM
you will have the mismatch whenever you have configured dot1q trunks and have different native vlans on either side of the trunk.
http://www.cisco.com/warp/public/473/176.html#subtopic1a
HTH
Narayan
12-26-2007 03:53 AM
Hi,
cr1-hy:-
interface GigabitEthernet3/5
description cs103-hy ge1/1
switchport
switchport access vlan 999
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 14,485
no ip address
logging event spanning-tree status
logging event bundle-status
logging event trunk-status
load-interval 30
storm-control broadcast level 0.35
end
=================================
#module 1 : 2-port 1000BaseX Supervisor
set vlan 999 1/1-2
set port disable 1/2
set port name 1/1 To-cr1-hy-gi3/5
set udld aggressive-mode enable 1/1
clear trunk 1/1 1-13,15-484,486-1005,1025-4094
set trunk 1/1 desirable dot1q 14,485,1006-1024
set trunk 1/2 off negotiate 1-4094
set spantree portfast 1/1-2 disable
set port lacp-channel 1/1-2 mode off
===========================================
based on the above config we are seeing the below error .
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet3/5 (1), with SMC0934007Z(cs103-hy2) 1/1 (999).
Please let us know why are we getting this error on cr1-hy
Thanks,
Akber.
12-24-2007 07:53 AM
I know on older switches like the 2924's you would get this message on the distribution boxes even when the link is not a trunk, in that case it is just a informational message and doesn't hurt anything.
12-26-2007 06:12 AM
Hi,
cr1-hy:-
interface GigabitEthernet3/5
description cs103-hy ge1/1
switchport
switchport access vlan 999
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 14,485
no ip address
logging event spanning-tree status
logging event bundle-status
logging event trunk-status
load-interval 30
storm-control broadcast level 0.35
end
=================================
#module 1 : 2-port 1000BaseX Supervisor
set vlan 999 1/1-2
set port disable 1/2
set port name 1/1 To-cr1-hy-gi3/5
set udld aggressive-mode enable 1/1
clear trunk 1/1 1-13,15-484,486-1005,1025-4094
set trunk 1/1 desirable dot1q 14,485,1006-1024
set trunk 1/2 off negotiate 1-4094
set spantree portfast 1/1-2 disable
set port lacp-channel 1/1-2 mode off
===========================================
based on the above config we are seeing the below error .
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet3/5 (1), with SMC0934007Z(cs103-hy2) 1/1 (999).
Please let us know why are we getting this error on cr1-hy
Thanks,
Akber.
12-26-2007 08:03 AM
Hi Akber,
From your cr1-hy can you post the output of "sh interface gig3/5 switchport" I believe it will show you native vlan as 1 and your switch running CATOS has native vlan 999 and that is the reason it is showing native vlan mismatch.
On CATOS switch when you configure "set vlan 999 1/1-2" as you see in your config , this will make vlan 999 as native on port 1/1 which is also a trunk port and IOS switch you have not defined any native vlan and is the reason default is vlan 1 on trunk ports and therefore you see native vlan mismatch.
HTH
Ankur
*Pls rate all helpfull post
12-26-2007 01:19 PM
Ankhasi is correct , the IOS side is native vlan 1 because you did not set it as anything else so the default is 1 . On the catos side the native vlan is whatever vlan you set the port into which is 999 in your case thus the mismatch , to correct on the IOS side add "switchport trunk native vlan 999" .
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