Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 923
Reconfiguring Stacked Switches as VLT, Reconfiguring
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Description Spanning tree mismatch at global level Behavior at Peer Up All VLT port channels go down on both VLT peers. A syslog error message is generated. Behavior During Run Time No traffic is passed on the port channels. A one-time informational syslog message is generated. Action to Take 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 System MAC mismatch Unit ID mismatch A syslog error 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. A syslog error message is generated. 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. A syslog error message is 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 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, if Peer 1 is unit ID "0", Peer 2 unit ID must be "1'. Version ID mismatch A syslog error message and an SNMP trap are generated. A syslog error message and an SNMP trap are generated. Verify the Dell Networking OS software versions on the VLT peers is compatible. For more information, refer to the Release Notes for this release. VLT LAG ID is not configured on A syslog error message is one VLT peer generated. The peer with the VLT configured remains active. A syslog error message is generated. The peer with the VLT configured remains active. Verify the VLT LAG ID is configured correctly on both VLT peers. VLT LAG ID mismatch The VLT port channel is brought The VLT port channel is brought Perform a mismatch check after down. down. the VLT peer is established. A syslog error message is generated. A syslog error message is generated. Reconfiguring Stacked Switches as VLT To convert switches that have been stacked to VLT peers, use the following procedure. 1 Remove the current configuration from the switches. You will need to split the configuration up for each switch. 2 Copy the files to the flash memory of the appropriate switch. 3 Copy the files on the flash drive to the startup-config. 4 Reset the stacking ports to user ports for both switches. 5 Reload the stack and confirm the new configurations have been applied. 6 On the Secondary switch (stack-unit1), enter the command stack-unit1 renumber 0. 7 Confirm the reload query. 8 After reloading, confirm that VLT is enabled. 9 Confirm that the management ports are interconnected or connected to a switch that can transfer Heartbeat information. Virtual Link Trunking (VLT) 923
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