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Question : Native VLAN mismatch
I have a switch who's log is showing Native VLAN mismatch discover <port> (0), with <switch> <port> (1).
So as I understand, the switch is showing it has a native VLAN of "0", and is mismatched with the other switch who's native vlan is "1".
I've tried conf t --> int fa0/24 --> switchport mode access vlan 1 with no success.
Here's config info:
interface VLAN1
ip address 10.2.2.160 255.255.255.0
no ip route-cache
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
description ToChipComTrans
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
ip default-gateway 10.2.2.5
snmp-server community private RW
snmp-server community public RO
snmp-server chassis-id 0x0F
!
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
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 1002 1003
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 0 - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0
Log:
%CDP-4-NATIVE_VLAN_MISMATC
H: Native VLAN mismatch discovered on FastEthernet0/24 (0), with ar191_2 FastEthernet0/1 (1).
%CDP-4-NATIVE_VLAN_MISMATC
H: Native VLAN mismatch discovered on FastEthernet0/23 (0), with ADP400B1 FastEthernet0/7 (1).
%CDP-4-NATIVE_VLAN_MISMATC
H: Native VLAN mismatch discovered on FastEthernet0/22 (0), with ADP400B12G GigabitEthernet0/11 (1).
%CDP-4-NATIVE_VLAN_MISMATC
H: Native VLAN mismatch discovered on FastEthernet0/24 (0), with ar191_2 FastEthernet0/1 (1).
%CDP-4-NATIVE_VLAN_MISMATC
H: Native VLAN mismatch discovered on FastEthernet0/23 (0), with ADP400B1 FastEthernet0/7 (1).
%CDP-4-NATIVE_VLAN_MISMATC
H: Native VLAN mismatch discovered on FastEthernet0/22 (0), with ADP400B12G GigabitEthernet0/11 (1).
what to do? is there a way to force switch to native vlan 1?
thanks,
Answer : Native VLAN mismatch
Oh- the reason that your command doesn't change anything is because by default, the ports are already on Vlan 1.
you may also- or first- need to enter the command
switchport trunk encapsulation dot1q
both that and the previous commands are on the interface, by the way.
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