Cisco DNA Center nodes lost network connectivity. Cannot SSH to nodes. Cluster and Enterprise port connected to Cisco Nexus Switches.
Cisco DNA Center kernel logs showing hung queue error messages. "sudo cat /var/log/kern.log"
Disable DCBX by configuring the below CLIs on the Cisco Nexus switch ports to which Cisco DNA Center appliances are connected prior to the Cisco DNA Center install
Configure below on all portsEnterprise port and Cluster port where Cisco DNA-Center is connected
no priority-flow-control mode auto
no lldp transmit
no lldp receive
Note: The first command that is shown above once applied doesn't show up in running-config for example when you execute "sh run int e1/1"
As a best practice, to avoid hitting the above problem we recommend that you configure above-mentioned CLIs on Cisco Nexus switch portsprior to the installation of Cisco DNA Center but if the Cisco DNA Center was already installed without applying the above CLIs and you are seeing the above symptom, in some cases above solution plus the reboot of the Cisco DNA Center nodes will fix the network connectivity.
However, it is strongly recommended that you open up a Cisco TAC case and work with the TAC engineer to assist them to troubleshoot if it is a production and or pilot deployment. There is also an internal defect raised for this problem and you could suggest TAC to lookup for faster resolution.
Hi, I would like to find out how a phantom queue can be configured in Cisco. A definition of it from  is presented here: "A phantom queue is a simulated queue, associated with each switch egress port, that sets ECN  marks based ...
I bought some FET-10G transceiver modules to connect a Cisco UCS 6140XP (single master switch) to Cisco Nexus 2248TP fabric extenders but i can't make them work.As per documentation the transceivers should work as "It is supported on fabric links from a N...
Hello guys, could you please advise if this is related to a bug or some other issue? Crashinfo in the attachment. Appreciate the help. SW uptime is 2 days, 8 hours, 12 minutesSystem returned to ROM by error - Debug Exception (Cou...
I am trying to access the web interface on an ISR 1100 series router. The model is the C1111-4P. It is running version 16.9. I have tried by downloading and installing the SDM-V25 facility on my PC. I have tried various (old) versio...
Hi,,My company use 3750 switch as core switch that connected to 4 access switches with trunks each access switch has 10 VLANs, the 3750 routes the traffic for 10 networks (VLANs) using Policy-Based Routing, each VLAN has three r...