OS10 Enterprise Edition User Guide Release 10.4.0E(R3)


Configure VLT

Verify that both VLT peer devices are running the same software version. For VRRP operation, configure VRRP groups and L3 routing on each VLT peer. To configure VLT and create a VLT domain where two devices are physically connected and provide a single port-channel connection to access devices, configure settings on each VLT peer device.

  1. To prevent loops in VLT domain, enable the spanning tree protocol globally ( spanning-tree mode {rstp | rapid-pvst} command). RSTP and RPVST+ modes are supported on VLT ports.
  2. Create a VLT domain by configuring the same domain ID on each peer ( vlt-domain command).
  3. Configure the VLT interconnect interfaces on each peer ( discovery-interface command). After you configure both sides of the VLTi, the primary and secondary roles in the VLT domain are automatically assigned.
  4. (Optional) After you configure a VLT domain on each peer switch and connect (cable) the two VLT peers on each side of the VLT interconnect, the system elects a primary and secondary VLT peer device. To configure the primary and secondary roles before the election process, use the primary-priority command. Enter a lower value on the primary peer and a higher value on the secondary peer.
    • NOTE: If the primary peer fails, the secondary peer (with the higher priority) takes the primary role. If the primary peer (with the lower priority) later comes back online, it is assigned the secondary role (there is no preemption).
  5. (Optional) Manually reconfigure the default VLT MAC address. Configure the VLT MAC address in both the VLT peers.
  6. (Optional) Configure a time interval to delay bringing up VLT ports after reload or peer-link restoration between the VLT peer switches.
  7. Configure the VLT backup link used for heartbeat timers ( backup destination { ip-address | ipv6 ipv6–address } [vrf management] command).
  8. Configure VLT port-channels between VLT peers and an attached device ( vlt-port-channel command). Assign the same VLT port-channel ID from 1 to 1024 to interfaces on different peers that you bundle together so that peer interfaces appear as a single VLT LAG to downstream devices.
  9. Connect peer devices in a VLT domain to an attached access device or server.

sample vlt configuration

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