API Guide

NOTE: If a VLT peer is reloaded, it automatically becomes the secondary peer regardless of the VLT primary-priority
setting.
4. Configure VLTi interfaces with the no switchport command.
5. Configure the VLTi interfaces on each peer using the discovery-interface command. After you configure both sides of
the VLTi, the primary and secondary roles in the VLT domain are automatically assigned if primary priority is not configured.
NOTE: Dell EMC recommends that you disable flow-control on discovery interfaces. Use the no flowcontrol
receive and no flowcontrol transmit commands to disable flow-control.
6. (Optional) Manually reconfigure the default VLT MAC address. Configure the same VLT MAC address in both VLT peers.
The manual configuration minimizes the time required to synchronize the default MAC address of the VLT domain on both
peer devices when one peer switch reboots.
7. (Optional) Configure a nondefault time interval to delay bringing up VLT ports in the secondary VLT peer after reload or
when VLTi comes up after a shutdown or failure. The default time interval is 90 seconds.
8. Configure the VLT heartbeat backup link using the backup destination {ip-address | ipv6 ipv6–address }
[vrf management] [interval interval-time] command.
9. Configure VLT port channels between VLT peers and an attached device using the vlt-port-channel command. Assign
the same VLT port channel ID from 1 to 128 to interfaces on different peers that you bundle together. The peer interfaces
appear as a single VLT port channel to downstream devices.
10. Connect peer devices in a VLT domain to an attached access device or server.
Configure a Spanning Tree Protocol
Dell EMC Networking recommends configuring one of the supported spanning tree protocols (MSTP, RSTP, or RPVST+) on
both VLT peers.
Use a spanning tree protocol for initial loop prevention during the VLT startup phase and for orphan ports. Configure the
spanning tree protocol in the network before you configure VLT on peer switches.
NOTE: RPVST+ is enabled by default.
Virtual Link Trunking 1279