Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Verify that both VLT peer devices are running the same operating system version. For VRRP operation, configure VRRP groups and L3 routing on each VLT peer.

Configure the following settings on each VLT peer device separately:

1. To prevent loops in a VLT domain, Dell EMC Networking recommends enabling STP globally using the spanning-tree mode command. Enabling STP prevents accidental loops that faulty wiring causes.
2. Create a VLT domain by configuring the same domain ID on each peer using the vlt-domain command.

3. (Optional) To override the default VLT primary election mechanism based on the system MAC addresses of the VLT nodes, configure a VLT node priority for each of the VLT nodes using the primary-priority command. Enter a lower priority value for the desired primary VLT peer and a higher priority value for the desired secondary VLT peer.

   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.