Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 1006
Troubleshooting VLT, Verifying a Port-Channel Connection to a VLT Domain
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Verifying a Port-Channel Connection to a VLT Domain (From an Attached Access Switch) On an access device, verify the port-channel connection to a VLT domain. Dell_TORswitch(conf)# show running-config interface port-channel 11 ! interface Port-channel 11 no ip address switchport channel-member fortyGigE 1/18,22 no shutdown 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 94. Troubleshooting VLT Description Bandwidth monitoring Domain ID mismatch Behavior at Peer Up 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 A syslog error message and an SNMP trap is generated when the VLTi bandwidth usage 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. Action to Take Depending on the traffic that is received, the traffic can be offloaded inVLTi. Verify the domain ID matches on both VLT peers. Dell Networking OS Version mismatch A syslog error message is generated. Remote VLT port channel N/A status Spanning tree mismatch at global level All VLT port channels go down on both VLT peers. A syslog error message is generated. A syslog error message is generated. N/A 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 at port level A syslog error message is generated. A one-time informational Correct the spanning tree syslog message is generated. configuration on the ports. Virtual Link Trunking (VLT) 1006
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