Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 624

• Configure the same VLT domain ID on peer devices. If a VLT domain ID mismatch occurs on VLT peers, the VLTi does not activate. • In a VLT domain, VLT peers support connections to network devices that connect to only one peer. VLT interconnect A VLTi is the link that synchronizes states between VLT peers. OS10 automatically adds VLTi ports to VLANs spanned across VLT peers. VLTi ports are not supported as members of VLANs configured on only one peer. • The system automatically provisions the required VLANs. • VLAN ID 4094 is reserved as an internal control VLAN for the VLT domain, and it is not user configurable. • VLT peer switches operate as separate nodes with independent control and data planes for devices attached to non-VLT ports. • The VLTi synchronizes L2 and L3 control-plane information across the two nodes. The VLTi is used for data traffic only when there is a link failure that requires using VLTi for data packets to reach their final destination. • Traffic with an unknown destination MAC address, multicast, or broadcast traffic can cause flooding across the VLTi. • MAC, ARP, IPv6 neighbors that are learned over VLANs across VLT peer nodes are synchronized across the nodes. • In a VLT domain, LLDP, flow control, port monitoring, and jumbo frame features are supported on a VLTi. 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. 624 Virtual link trunking