RE: Need help in understanding STP logs

Ramesh,

What is your topology looks like? Where is your root switch? I saw you that you enable root guard feature on this port. What is the status of the port? Is it in the Inconsistent state? Use the command show spanning-tree for this interface g3/63 to give you more information.

Please post more information so we can help you further.

--
Mohammad Mousa
CCIE #36990
> Date: Mon, 11 Mar 2013 21:32:16 -0700
> From: rameshkumar123321_at_yahoo.com
> Subject: Need help in understanding STP logs 
> To: ccielab_at_groupstudy.com
> 
> Adding subject
> 
> Ramesh.
> 
> 
> ________________________________
>  From: ramesh Kumar
> <rameshkumar123321_at_yahoo.com>
> To: "ccielab_at_groupstudy.com"
> <ccielab_at_groupstudy.com> 
> Sent: Tuesday, March 12, 2013 10:00 AM
> Subject:
> Folks,
> 
> We are seeing this log in our switch. I am suspecting someone has
> connected a switch with native vlan mismatch to this port.  
> 
> 019109: Mar 12
> 03:26:55.293 UTC: %DTP-5-TRUNKPORTON: Port Gi3/36 has become dot1q trunk
> 019110: Mar 12 03:26:55.573 UTC: %SPANTREE-2-RECV_PVID_ERR: Received BPDU with
> inconsistent peer vlan id 1 on GigabitEthernet3/36 VLAN39.
> 019111: Mar 12
> 03:26:55.573 UTC: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking GigabitEthernet3/36
> on MST0. Inconsistent local vlan.
> 019112: Mar 12 03:26:55.793 UTC:
> %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet3/36, changed
> state to up
> 019113: Mar 12 03:27:09.793 UTC: %SPANTREE-2-UNBLOCK_CONSIST_PORT:
> Unblocking GigabitEthernet3/36 on MST0. Port consistency restored.
> 019114: Mar
> 12 03:27:11.612 UTC: %SPANTREE-2-RECV_PVID_ERR: Received BPDU with
> inconsistent peer vlan id 1 on GigabitEthernet3/36 VLAN39.
> 019115: Mar 12
> 03:27:11.612 UTC: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking GigabitEthernet3/36
> on MST0. Inconsistent local vlan.
> 
> interface GigabitEthernet3/36
>  switchport
> trunk native vlan 39
>  switchport trunk allowed vlan 64
>  switchport mode trunk
>  logging event link-status
>  logging event trunk-status
>  spanning-tree guard
> root
> end
> 
> Could it be possible that the other end has a non-cisco switch with
> a different native vlan configured?
> 
> 
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