Spaning Tree MST P2p Dispute

Unanswered Question
Oct 23rd, 2014
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hi

 

i have a pair of C3750X running IOS 15.2(1)E

 

they are connected over througt a WAN (Layer2 VPLS 802.1Q) connection.

the port on the Root Bridge is in a block state because there is a P2p Dispute. anyone got a clue to why this i happening

below is the port configuration, spanning tree configuration i have attached debug output from the Root Switch

 

 

Root Switch

spanning-tree mode mst
spanning-tree logging
spanning-tree extend system-id
spanning-tree mst 0 priority 4096

 

interface GigabitEthernet1/0/1
 description ** xxxxxxx **
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 276-281
 switchport mode trunk
 storm-control broadcast level 2.00

 

2nd switch

 

spanning-tree mode mst
spanning-tree logging
spanning-tree extend system-id
spanning-tree mst 0 priority 28672

 

interface GigabitEthernet1/0/1
 description ** xxxxx **
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 276-281
 switchport mode trunk

 

 

 

 

 

 

 

 

 


 

 

 

 

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houtan haddadla... Thu, 10/23/2014 - 09:17
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Hi,

 

The problem can be caused by  STP or EtherChannel misconfiguration, or by an uni-directional link.

1- You can check the bi-directional functionality of the link or MST configuration

2- if you configured  "vlan dot1q tag native" , remove it.

 

Houtan

danhed7400 Thu, 10/23/2014 - 10:49
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hi.

the link is is working when i filter off BPDU, and the vlan dot1q tag native is not enabled

 

houtan haddadla... Thu, 10/23/2014 - 11:42
User Badges:

Hi, 

 

Pruning VLAN 1 can be interupting  for some STP functionalities. change following link on both of your interfaces:

 switchport trunk allowed vlan 1,276-281

 

Houtan  

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