cisco nexus 9000 %STP-2-DISPUTE_DETECTED:

[shlomoi]

Hi ,

We recently connected a Maraki 9300L switch against our Nexus 9000.

A trunk al vlans is connected between them.
Nothing is connected to Maraki yet except the Nexus and we get error messages on the Nexus.

Does anyone have an idea what the problem is

error messages on nexus :

 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/10 on VLAN0012.
 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/11 on VLAN0013.
 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/23 on VLAN0014.

show spanning tree on nexus

n9k# show spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: VLAN0012, VLAN0013, VLAN0014,
L2 Gateway STP is disabled
Port Type Default is disable
Edge Port [PortFast] BPDU Guard Default is disabled
Edge Port [PortFast] BPDU Filter Default is disabled
Bridge Assurance is enabled
Loopguard Default is disabled
Pathcost method used is short
STP-Lite is disabled

spanning tree on meraki 9300L switch :

Thanks

[Flavio Miranda]

@shlomoi 

  The nexus is the root for the vlans and it is running RAPID-PVSTP with default priority of 32768.

Then, there is the 9300 running RSTP with the same priority. Nexus is probably receiving BPDU with same priority and is complaining about that.

Try to lower the priority on 9300 and make them run the same STP flavor.