02-20-2006 04:36 PM - edited 03-03-2019 01:55 AM
All,
I have investigated and made sure the speed/duplex have been changed between both devices attached to int-faces.
here is my error.
02-ext-liv FastEthernet0/20 (40).
Feb 20 16:22:18.711 PST: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/xx
2900 series switch.
What other approach shall I take to pin point the issue since this is only informational on the error log.
-fz
Thanks in advance!
02-20-2006 04:51 PM
Hi,
The 'error' message is simply because you have used different VLAN IDs on the access ports at either end. CDP discovers this and logs a warning. The message is pretty harmless in itself.
There are a couple of options to get rid of it:
- configure the access port to be the same VLAN on the two switches at either end of the link
--- OR ----
- enable CDP version 1 on your switches. YOu can do this using: 'no cdp advertise-v2'.
The latter option is simpler and you don't really lose much...
Hope that helps - pls rate the post if it does.
Paresh
02-20-2006 04:58 PM
This will not hurt anything , if you want to get rid of it you'll have to match the vlan id on both ends of the link . Say the far end of the link is in vlan 20 , then you have to put your switchports on the 2900 inot vlan 20 also along with the layer3 SVI that you manage the switch with , this would get rid of the message . The switch will work fine even with this message in the log if you do nothing to the switch .
02-20-2006 06:11 PM
If your native VLAN on opposite ends of a trunk, you can change it by entering the same command on each end of the trunk:
switchport trunk native vlan XX. Make sure that the native VLAN is significant to your network.
02-22-2006 10:28 AM
Thanks to all!! Ialways go by a few rules. No major changes on a FRIDAY and don't it if it's not broken!! lol
-fz
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