Native trunk vlan mismatch

I'm having issues with a 2960 saying native trunk mismatch. The 2960 is trunked to a 3750. I check the configs on both ports and both are set to the same native vlan. Only the 2960 is complaining of this issue and not the 3750. The 2960 is passing internet traffic, but I am unable to ping the IP of the 2960 or telnet. From the 2960 console, I am unable to ping our gateway. Already tried rebooting. I'm at a lose. HELP!

3750 Interface:
interface GigabitEthernet2/0/1
description uplink to BLDG 13
switchport trunk encapsulation dot1q
switchport trunk native vlan 3
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust cos
macro description cisco-switch | cisco-switch | cisco-switch
auto qos voip trust
2960 Interface:
interface GigabitEthernet0/2
description uplink to BLDG 1
switchport trunk native vlan 3
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust cos
macro description cisco-switch | cisco-switch | cisco-switch
auto qos voip trust

Similar Messages

LMS4.1 wrong shown Trunk VLAN mismatch Discrepancies

shown Trunk VLAN mismatch Discrepancies are wrong:
C3650G-12S 12.2(46)SE IPService-K9
C2960-24TC-L 12.2(35)SE5 LANBase-M
As asked from CLI (sh int trunk, sh vlan) VLAN-Indexes and VLAN-Names are excactly the same at both sites.
Same as with duplex false positives, its hard to pick up the fiew real Trunk Vlan missmatches if you see much more false positives in that category.
Trunk VLANs Mismatch
Severity Medium
First Found 13 Oct 2011, 04:01:32 CEST
Description [PDMSW020012,GigabitEthernet1/0/10], [PDMTK_SWITCH_3,GigabitEthernet0/1]
Detail This Trunk Link has ports with mismatching active VLAN sets.
Port GigabitEthernet1/0/10 on device PDMSW020012 trunks following VLANs:Device type and OS version of PDMSW020012:
Cisco IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(46)SE, RELEASE SOFTWARE (fc2)VLAN_ZEIT present in VTP domain NULL_x(T) and having index 51
VLAN_GMA present in VTP domain NULL_x(T) and having index 55
VLAN_TK present in VTP domain NULL_x(T) and having index 50
default present in VTP domain NULL_x(T) and having index 1
Port GigabitEthernet0/1 on device PDMTK_SWITCH_3 trunks following VLANs:Device type and OS version of PDMTK_SWITCH_3:
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Port GigabitEthernet0/1 on device PDMTK_SWITCH_3 does not trunk the following VLAN indices:Device type and OS version of PDMTK_SWITCH_3:
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)Index:55
Index:1
Index:50
Index:51Note: This discrepancy does not hold good if devices on either end of the trunk support different number of vlans.

Hi Afroz,
i tried this, but it didn´t help.
i also have connected a 3750x in the same way to the N7K´s, there is no issue.
the only difference of the configuration is, that i have to enter "switchport trunk encapsulation dot1q" for the Uplink Ports / Portchannel.
for the same switch (2960s) and the same ports i have also the discrepancy "Trunk negotiation across VTP boundary"
anyhow, vtp is turned off:
VTP Version capable             : 1 to 3
VTP version running             : 3
VTP Domain Name                 : Access-XYZ
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : 1ce6.c788.e400
Feature VLAN:
VTP Operating Mode                : Off
Number of existing VLANs          : 11
Number of existing extended VLANs : 0
Maximum VLANs supported locally   : 255
Feature MST:
VTP Operating Mode                : Transparent
Feature UNKNOWN:
VTP Operating Mode                : Transparent
is there really a configuration issue, or that are only wrong messages from LMS?
kind regards,
Michael

CW: Trunk VLANs Mismatch

Both switches are configured with the same allowed vlans
switchport trunk allowed vlan 2-4094
Can anyone explain why I get this result?
The fix from CiscoWorks says:
You can resolve this by modifying the list of allowed VLANs between the two ends of a trunk and ensuring that there is no mismatch. You cannot fix this discrepancy through Campus Manager.

this could be CSCsq79950
have a look at this thread https://supportforums.cisco.com/message/656304#656304
and the bugID to see if it matches:
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?caller=pluginredirector&method=fetchBugDetails&bugId=CSCsq79950

Native Vlan Mismatch on Switch LD connected to

I am running 3 switches each with the same 3 vlans. I also have 2 local directors in failover mode. The primary has interfaces connected to switch one and the secondary has interfaces to switch two. Trunking is disabled on all device ports but enabled on a dedicated fiber connection between the 2 switches
The first vlan is vlan 1 for management
The second is vlan 2 for the gateway side of the local directors
The third is vlan 3 for the server side of the local directors
On the primary switch I am logging CDP messages telling me i have a native vlan mismatch on the 2 local director ports. The secondary switch I dont get these messages.
Any ideas what is going on here and why? Thanks, Art.

You mention above " but trunking is enabled on a dedicated fiber connection between the two switches", therefore trunking is enabled.
Because trunked ports need to be assigned to the same native vlan, I would do a "show trunk" and verify that the port used for trunking on each switch, are assigned to the same native vlan, I've seen the mismatch if the are not. That command above is if your switch is using CatalystOS, otherwise, use this command for NativeOS - sh int fast 0/1 switchport and look for the "trunking native mode vlan" number. They must match on each side. To correct the problem, do set vlan 1 4/10 to assign port 4/10 to vlan 1 which, is your management vlan which I assume you've choosen to be your native vlan.
Hope this helps.

%CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface fa1.

I am getting the following message in my logs on SF300-8
"%CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface fa1."
What is causing the error, see VLAN setup below:

Hi,
Yes, in this case you can change the native vlan on the that switch with the command (config-if)#switchport trunk native vlan #, there is no need to reboot the switch in order for the change to take effect.
Regards,

%CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi26.

Hell everyone,
I have a sonicwall firewall with 6 vlan and 3 cisco sg28 switches connected to it, everything is working fine, but I se I have these waring the the log files of all three switches.
I just need to know the best way to resolve this..
the firsrt switch is the "core" switch and the other two are connect to it in a star pattern.
Sonicwall--switch1.101.1----switch 101.10
|
|
switch 101.20
So core switch 101.1 has default vlan set to 100 which is the default lan on the sonicwall that it is connected to. There are no devices in .100
switch 101.10 has devault vlan set to 1
switch 101.20 has default vlan set to 1
switch 101.1 is seeing these warnings..
2147483643
2014-Apr-01 19:33:08
Warning
%CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi27.
2147483644
2014-Apr-01 19:30:52
Warning
%CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi26.
switch 101.10 is seeing these warnings;
%CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi52.
port gi52 is connecting to switch 101.1
switch 101.20 is seeing these warings;
%CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi27.
portgi27 is connected to switch 101.1
Thanks!

Hi,
Yes, in this case you can change the native vlan on the that switch with the command (config-if)#switchport trunk native vlan #, there is no need to reboot the switch in order for the change to take effect.
Regards,

How one Switch identify the Native vlan mismatch

Dear All,
I am using two cisco L2 switches. Both are connected by a trunk link. Unfortunately I configured different native vlan between two switches. Suddenly I got an error that native vlan mismatch. When I changed the configuration Now it's working fine. My question is that how one switch identify that native vlan mismatch(either by Bpdu, cdp or packet). Please mention which of the following used by switch to identify native Vlan mismatch.
Regards,
Sanjib

Sanjib, Karsten,
It's CDP.
Yes, and STP as well if you run a trunk between the two switches. PVST+ and RPVST+ BPDUs have a TLV in their trailer that carries the VLAN number for which the BPDU was originated. If the BPDU is received in a different VLAN (caused by a native VLAN mismatch), the receiving switch will be able to detect it.
Wireshark 1.12.x will be capable of displaying this TLV field in captured PVST+ and RPVST+ BPDUs. Until 1.12.x is released, you may want to try daily builds from:
http://www.wireshark.org/download/automated/
They already incorporate the enhancement.
Best regards,
Peter

Vlan mismatch on a non-trunk port?

I have a 6500, running CatOS 7.6(2), directly connected to a 3500xl (running IOS 12.0(5)) with Cat5. I am *not* trunking between them. Each port is running under a different native VLANs, which I wouldn't think was an issue since they aren't trunking. The connection works fine, and packets flow between them as expected, but my 6500 complains about a native VLAN mismatch on that port. Is this a bug on the CatOS side? The 3500xl doesn't seem to complain about the native vlans being different.

Yes, these are CDP messages:
%CDP-4-NVLANMISMATCH:Native vlan mismatch detected on port 4/39
I am sure the port is not trunking:
Commons_6506_1> show trunk 4/39
Port Mode Encapsulation Status Native vlan
4/39 off dot1q not-trunking 54
Each port is in a different access VLAN. I just thought it odd that the 6500 cared about the native vlans since there was no trunking, and thus, no native vlan (just the active vlan).

WLC - Native VLAN mismatch

Can anyone tell me or point me in the proper direction for the method to set the native vlan on the WLC? I have a 3750 that is showing a native vlan mismatch going to the 4402.

hello - have a look at this link
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a008070ba8f.shtml
explains config for WLC and uplink switch.
hth
andy

Native vlan mismatch

Dear all,
I am getting the following message in our VSS.
Sep 2 05:56:18.501: %CDP-SW1-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch
discovered on GigabitEthernet1/2/29 (304), with HQ-DC-CSW-VSS.abc.com
GigabitEthernet2/2/28 (300).
interface GigabitEthernet2/2/28
description *** F5 Load Balancer Port 2 Primary ***
switchport
switchport access vlan 300
switchport mode access
interface GigabitEthernet1/2/29
description *** F5 Load Balancer Port 5 Primary ***
switchport
switchport access vlan 304
switchport mode access
Can anyone explain me how I get this message although g2/2/28 and gi 1/2/29 are access ports.?How to fix this issue?Is this interrupt the network(loop)?
Thanks

Could u try this:
sw1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
sw1(config)#no cdp advertise-v2
regards
Inayath

Connect additional switch to existing switch, receiving vlan mismatch, also want to configure same VLAN's

Hello! I have a network in with a i have a switch stack configured for voice and data. Particularly, both are configured to pass over the same port.
I want to add a temporary switch (different model) to the network and configure it the same way. In particular, I want to see that I can set up the voice/data VLAN's on this new switch and test to confirm all is working. I need an uplink though back to the original switches so that this new switch can get a proper connection.
When I connect the new switch in, I can't seem to get an IP and the CLI keeps showing a "Native VLAN mismatch error" and shows the hostname of the original switch.
So my questions are:
How can I add this temporary switch to the existing switch to get a connection, not as another stacked switch?
How can I configure the voice/data VLAN's on the switch so as to be able to test the voice/data traffic over the same port?

Hi! Yes I did change the native vlan for that particular port on "Sw2" (New switch) to match "Sw1" (existing switch). The Sw2 port shows native vlan inactive though.
Below is an output from them on that port.
(SW1)
Name: Gi3/0/5
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 100 (VLAN0100)
Administrative Native VLAN tagging: enabled
Voice VLAN: 10 (VLAN0010)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
SW2
Name: Gi3/0/5
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 100 (Inactive)
Administrative Native VLAN tagging: enabled
Voice VLAN: 10 (Voice)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

VLAN mismatch question

Hi,
My setup is:
switcha(vlan 1) <-> router <-> switchb(vlan2)
Switcha and switchb are on different subnets. Why do I get a vlan mismatch in this case? The vlan assigned to the connecting ports are irrelevant because these switches are in different subnets.

HI
Are this switches connected with each other.if they are then i think they are configured as trunk ports.so the native vlan should be same on both the swithes.
Thanks
Mahmood

Vlan Mismatch WS-C6506 & 2950

Hi guys,
I am having problem. I am not sure about this issue. Recently, I have new switch(2950) plugin into the Core switch. However, it keep generating log every 30 mins on my core switch. any idea about this problem?
2005 Jul 01 22:51:15 GMT+2 +07:00 %CDP-4-NVLANMISMATCH:Native vlan mismatch dete
cted on port 3/22
Core> (enable) show port 3/22
* = Configured MAC Address
Port Name Status Vlan Duplex Speed Type
3/22 2950 connected 210 full 100 100BaseFX MM
Core> (enable) show trunk 3/22
* - indicates vtp domain mismatch
# - indicates dot1q-all-tagged enabled on the port
Port Mode Encapsulation Status Native vlan
3/22 off negotiate not-trunking 210
Port Vlans allowed on trunk
3/22 1-1005,1025-4094
Port Vlans allowed and active in management domain
3/22 210
Port Vlans in spanning tree forwarding state and not pruned
3/22
core#show ver
WS-C6506 Software, Version NmpSW: 7.6(7)
Copyright (c) 1995-2004 by Cisco Systems
NMP S/W compiled on May 6 2004, 23:21:07
System Bootstrap Version: 7.1(1)
System Boot Image File is 'bootflash:cat6000-sup2k8.7-6-7.bin'
System Configuration register is 0x102
Core--->2950
2950#show vla
VLAN Name Status Ports
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Fa0/10, Fa0/11, Fa0/12
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20
Fa0/21, Fa0/22, Fa0/23, Fa0/24
Fa0/25, Fa0/26
2950#show vtp st
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 250
Number of existing VLANs : 5
VTP Operating Mode : Transparent
VTP Domain Name : access
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xB6 0x18 0x3A 0xBA 0xC7 0x54 0x71 0x55
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Hi guys,
Thanks for promptly replied. However I had tried to harded core on 2950 Vlan 210(every interfaces). No luck. The core switch still flooding the log. Correct If I am wrong. Since my 2950 is configured as transparent. It shouldn't broadcast the VLAN info. Am I right? This is not the switch connected to the VLAN 210. I have another switch 210 connected to Core. But it doesn't generate the log.
Core(enable) show vlan
VLAN Name Status IfIndex Mod/Ports, Vlans
1 default active 5 2/23-24
3/9,3/18,3/23-24
4/28,4/38-40
5/9-48
5 ServerFarm active 112 4/1-9,4/11-27,4/29-30,4/
33-37,4/43
5/1-8
20 External active 10 4/10,4/41,4/44-48
30 External2 active 11
80 DMZ active 114 4/42
100 User1 active 12
120 User2 active 13 2/1-21
3/1-8,3/10-17,3/19-21
210 VLAN0210 active 116 2/22
3/22
4/31-32
Core# (enable) show vlan 210
VLAN Name Status IfIndex Mod/Ports, Vlans
210 VLAN0210 active 116 1/1-2
2/22<<
3/22<<
4/31-32
15/1
Core> (enable) show port 2/22
* = Configured MAC Address
Port Name Status Vlan Duplex Speed Type
2/22 SwitchA connected 210 full 100 100BaseFX MM

Vlan mismatch error

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!

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

How can i disable cdp vlan mismatch message?

Hello,
I have some trouble with vlan mismatch using cdp message. because, port of main siwch configured vlan 100, but port of access switch configured vlan1. thus vlan mismatch message displayed using cdp message.
At this time, I'm usally try to change some value both of switches. for examlple, chaning vtp domain or disabling cdp or adjusting vlan information both of swiches.
Is there any other method to troubleshooting these issue?
regards,
John.

Hi joh,
Changing the vtp domain and all will not help you,It is clear that there is mismatch in the allowing vlan in the connected ports of both sitches.
Try to configure both ports in the same vlan, or else leave the port of the access switch in trunk mode without specifiying any vlan if it doesn't affect your traffic.
Rgs,

Native trunk vlan mismatch

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