What is the mean "%STP-2-DISPUTE_DETECTED" ?

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Dec 23rd, 2009
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Hi.


We test the Nexus as daisy chain.


but When we attach the port to port in the same module, We got the following log :


"%STP-2-DISPUTE_DETECTED"


I had searched the log on CCO, but I can't find exactly what mean is.

If you know the log, Please let me know as soon as possibly


Thanks in advance.

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Jon Marshall Wed, 12/23/2009 - 15:51
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syjeon wrote:


Hi.


We test the Nexus as daisy chain.


but When we attach the port to port in the same module, We got the following log :


"%STP-2-DISPUTE_DETECTED"


I had searched the log on CCO, but I can't find exactly what mean is.

If you know the log, Please let me know as soon as possibly


Thanks in advance.


Error message -


1. %STP-2-DISPUTE_DETECTED: Dispute detected on port [chars] on [chars]. The spanning tree has detected a Dispute on this interface. The BPDU received from  the peer is Inferior with designated role and state as     learning and/or forwarding. Since this  condition could be caused by an     unidirectional link failure, the interface is put into blocking state  and marked as disputed in order to prevent possible loops from being created.


Recommended Action: Issue the show spanning-tree inconsistentports command to review the list  of interfaces with Dispute. Dispute is caused if the peer in not receiving the Superior BPDUs sent  by this interface. That is why the peer continues to send its own Inferior BPDUs. Determine why  devices connected to the listed ports are not receiving BPDUs. One reason could be a failure in the  cable: if the link has a failure that makes it unidirectional (you can not transmit but you can receive)  it should be replaced with a proper cable.

Related documents- No specific documents apply to this error message.


Jon

Krzysztof Zaleski Tue, 03/31/2015 - 02:44
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Hello,

I just wanter to refresh this issue. I understand the reason of dispute on a certain link, but recently I had a situation where dispute appeared on all links attached to N7K. There are two reasons I can think of. One is some kind of bug/instability on the N7K itself. Two, there was some STP inconsistency in the network, however all links are rather edge switches. This could point to some vPC issue, where one peer still sends superior BPDU, and the other does not (bug?).

Cheers,

Krzysztof

habadr Wed, 12/23/2009 - 19:02
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Hi


This is related to new feature called Spanning tree dispute mechanism in NX-OS and 6500 starting 12.2(33)SXI. The following link has more details anout it in Nexus 7K running NX-OS 4.2.


http://www.cisco.com/en/US/docs/switches/datacenter/sw/4_2/nx-os/layer2/configuration/guide/Cisco_Nexus_7000_Series_NX-OS_Layer_2_Switching_Configuration_Guide_Release_4.2_chapter6.html#con_1490082


Thanks


Hatim Badr

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