Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 1100

Table 94. Troubleshooting VLT Description Behavior at Peer Up Bandwidth monitoring Domain ID mismatch A syslog error message and an SNMP trap is generated when the VLTi bandwidth usage goes above the 80% threshold and when it drops below 80%. The VLT peer does not boot up. The VLTi is forced to a down state. A syslog error message and an SNMP trap are generated. Behavior During Run Time Action to Take A syslog error message Depending on the traffic and an SNMP trap is that is received, the generated when the traffic can be offloaded VLTi bandwidth usage inVLTi. goes above its threshold. The VLT peer does not boot up. The VLTi is forced to a down state. A syslog error message and an SNMP trap are generated. Verify the domain ID matches on both VLT peers. Dell Networking OS Version mismatch A syslog error message A syslog error message is generated. is generated. Remote VLT port N/A N/A channel status Spanning tree mismatch at global level All VLT port channels go down on both VLT peers. A syslog error message is generated. No traffic is passed on the port channels. A one-time informational syslog message is generated. Follow the correct upgrade procedure for the unit with the mismatched Dell Networking OS version. Use the show vlt detail and show vlt brief commands to view the VLT port channel status information. During run time, a loop may occur as long as the mismatch lasts. To resolve, enable RSTP on both VLT peers. Spanning tree mismatch A syslog error message at port level is generated. System MAC mismatch A syslog error message and an SNMP trap are generated. Unit ID mismatch The VLT peer does not boot up. The VLTi is forced to a down state. A one-time informational syslog message is generated. A syslog error message and an SNMP trap are generated. The VLT peer does not boot up. The VLTi is forced to a down state. Correct the spanning tree configuration on the ports. Verify that the unit ID of VLT peers is not the same on both units and that the MAC address is the same on both units. Verify the unit ID is correct on both VLT peers. Unit ID numbers must be sequential on peer units; for example, 1100 Virtual Link Trunking (VLT)