Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 1002
Troubleshooting VLT, Description, Behavior at Peer Up, Behavior During Run, Action to Take
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Troubleshooting VLT To help troubleshoot different VLT issues that may occur, use the following information. NOTE: For information on VLT Failure mode timing and its impact, contact your Dell Networking representative. Table 74. Troubleshooting VLT Description Behavior at Peer Up Behavior During Run Time Action to Take Bandwidth monitoring 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%. 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. Domain ID mismatch 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. 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. A one-time informational syslog message is generated. A syslog error message and an SNMP trap are generated. Correct the spanning tree configuration on the ports. Verify that the unit ID of VLT peers is not the same on both units and 1002 Virtual Link Trunking (VLT)
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