Native vlan mismatch

Discussion in 'Cisco' started by wai, Sep 7, 2007.

  1. wai

    wai

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    Hi all,

    I would like to know what's causing the native vlan mismatch to happen ? Also, what's the impact to the performance or connectivity of the problem? So far, my network still running without any problem.

    FYI, both Fa0/7 and Fa0/27 are set to access mode and both trunking between the switches are configured correctly.

    I can't figure out what has caused these error message as shown below.

    Sep 7 17:14:36: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/7 (4), with Cat3550_SW4 FastEthernet0/27 (6).
    Sep 7 17:15:08: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/7 (4), with Cat3550_SW2 FastEthernet0/30 (2).

    Appreciate your advice.
     
    wai, Sep 7, 2007
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  2. wai

    gascan.jyy4

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    where is the trunk, that you configured ?
    the mismatch native will cause spanning tree loop and undesire result in some situation.
     
    gascan.jyy4, Sep 7, 2007
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  3. wai

    wai

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    The following is the trunk. I already used the same encapsulation and mode but still getting the same native vlan mismatch error.

    Could you advice?

    Cat3550_SW1#sh int trunk

    Port Mode Encapsulation Status Native vlan
    Gi0/1 on 802.1q trunking 1
    Gi0/2 on 802.1q trunking 1

    Port Vlans allowed on trunk
    Gi0/1 1-4094
    Gi0/2 1-4094


    Cat3550_SW4#sh int trunk

    Port Mode Encapsulation Status Native vlan
    Gi0/1 on 802.1q trunking 1
    Gi0/2 on 802.1q trunking 1

    Port Vlans allowed on trunk
    Gi0/1 1-4094
    Gi0/2 1-4094
     
    wai, Sep 10, 2007
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