Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 1007

Description System MAC mismatch Unit ID mismatch Version ID mismatch VLT LAG ID is not configured on one VLT peer VLT LAG ID mismatch Behavior at Peer Up 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 syslog error message and an SNMP trap are generated. A syslog error message is generated. The peer with the VLT configured remains active. The VLT port channel is brought down. A syslog error message is generated. Behavior During Run Time 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 syslog error message and an SNMP trap are generated. A syslog error message is generated. The peer with the VLT configured remains active. The VLT port channel is brought down. A syslog error message is generated. Action to Take 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'. Verify the Dell Networking OS versions on the VLT peers is compatible. For more information, refer to the Release Notes for this release. Verify the VLT LAG ID is configured correctly on both VLT peers. Perform a mismatch check after the VLT peer is established. 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. Specifying VLT Nodes in a PVLAN You can configure VLT peer nodes in a private VLAN (PVLAN). VLT enables redundancy without the implementation of Spanning Tree Protocol (STP), and provides a loop-free network with optimal bandwidth utilization. Because the VLT LAG interfaces are terminated on two different nodes, PVLAN configuration of VLT VLANs and VLT LAGs are symmetrical and identical on both the VLT peers. PVLANs provide Layer 2 isolation between ports within the same VLAN. A PVLAN partitions a traditional VLAN into sub-domains identified by a primary and secondary VLAN pair. With VLT being a Layer 2 redundancy mechanism, support for configuration of VLT nodes in a PVLAN enables Layer 2 security functionalities. To achieve maximum VLT resiliency, you should configure the PVLAN IDs and mappings to be identical on both the VLT peer nodes. Virtual Link Trunking (VLT) 1007