The old native vlan question.....

Answered Question
Apr 1st, 2012

Two switches, both connected to each other via e1/0.  Why am I getting a native vlan mismatch error when they are both access ports?

BTW, this is not live equipment, but a simulator.

DLS1#sh run int e1/0
Building configuration...

Current configuration : 106 bytes
!
interface Ethernet1/0
switchport
switchport access vlan 100
switchport mode access
duplex auto
end

DLS1#
*Apr  1 19:19:58.507: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on Ethernet1/0 (1), with ALS1 Ethernet1/0 (100).
DLS1#


ALS1#sh run int e1/0
Building configuration...

Current configuration : 106 bytes
!
interface Ethernet1/0
switchport
switchport access vlan 100
switchport mode access
duplex auto
end

ALS1#
*Apr  1 19:20:51.063: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on Ethernet1/0 (100), with DLS1 Ethernet1/0 (1).
ALS1#

Sh cdp fro ALS1:

ALS1#sh cdp nei det
-------------------------
Device ID: Router1
Entry address(es):
  IP address: 100.1.1.11
Platform: Linux Unix,  Capabilities: Router
Interface: Ethernet0/0,  Port ID (outgoing port): Ethernet0/0
Holdtime : 168 sec

Version :
Cisco IOS Software, Linux Software (I86BI_LINUX-ADVENTERPRISEK9-M), Experimental Version 12.4(20090407:185408) [yuiu-redbuild-V124_24_5_6_PIC1 177]
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Wed 08-Apr-09 02:09 by yuiu

advertisement version: 2
Duplex: half
Management address(es):

-------------------------
Device ID: DLS1
Entry address(es):
  IP address: 100.1.1.1
Platform: Linu,  Capabilities: Router Switch
Interface: Ethernet1/0,  Port ID (outgoing port): Ethernet1/0
Holdtime : 170 sec

Version :
Cisco IOS Software, Linux Software (LINUXL2-UPK9-M), Experimental Version 12.2(20100802:165548) [mtimm-mtrosel2iol 102]
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Mon 02-Aug-10 10:05 by mtim

advertisement version: 2
VTP Management Domain: ''
Native VLAN: 1 (Mismatch)
Management address(es):
  IP address: 100.1.1.1

ALS1#

ALS1#
ALS1#ping 100.1.1.1
% Unrecognized host or address, or protocol not running.

ALS1#

100.1.1.1 is a SVI on DLS1.

I have this problem too.
0 votes
Correct Answer by jszapipes about 2 years 1 week ago

Would imagine that vlan 100 exists on only one of the switches. Also as mentioned above you must set your ports to trunk when connecting switches together utilizing a cross over cable.

Sent from Cisco Technical Support iPhone App

Correct Answer by misterhaq about 2 years 2 weeks ago

Hi There,

First of all, configure both switchports as

Switchport mode trunk.

This should rectify your problem as both devices will have a default native vlan of vlan 1

Regards

Imran

  • 1
  • 2
  • 3
  • 4
  • 5
Average Rating: 5 (2 ratings)
Correct Answer
misterhaq Mon, 04/02/2012 - 14:20

Hi There,

First of all, configure both switchports as

Switchport mode trunk.

This should rectify your problem as both devices will have a default native vlan of vlan 1

Regards

Imran

Correct Answer
jszapipes Thu, 04/05/2012 - 15:29

Would imagine that vlan 100 exists on only one of the switches. Also as mentioned above you must set your ports to trunk when connecting switches together utilizing a cross over cable.

Sent from Cisco Technical Support iPhone App

jimmysands73_2 Fri, 04/06/2012 - 07:13

It was a lab I was doing, plus on a simulator, so who knows where the issue was.  Thanks for the replies.

Actions

Login or Register to take actions

This Discussion

Posted April 1, 2012 at 12:29 PM
Stats:
Replies:4 Avg. Rating:5
Views:1052 Votes:0
Shares:0
Tags: No tags.

Discussions Leaderboard