Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.1.0 - Page 715
Terminology, VLT domain
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VLT physical ports System management protocols L3 VLAN connectivity Optimized forwarding with VRRP Spanning-Tree Protocol 802.1p, 802.1q, LLDP, flow control, port monitoring, and jumbo frames are supported on VLT physical ports. All system management protocols are supported on VLT ports - SNMP, RMON, AAA, ACL, DNS, FTP, SSH, syslog, NTP, RADIUS, SCP, and LLDP. Enable L3 VLAN connectivity (VLANs assigned with an IP address) on VLT peers by configuring a VLAN interface for the same VLAN on both devices. To enable optimized L3 forwarding over VLT, use VRRP Active-Active mode. VRRP Active-Active mode enables each peer to locally forward L3, resulting in reduced traffic flow between peers over the VLTi. RSTP and RPVST+ are supported on VLT ports. NOTE: 802.1x, DHCP snooping, MSTP, IGMP snooping, MLD snooping, ingress and egress QoS are not supported on VLT ports. Terminology Discovery interface Port interfaces on VLT peers in the VLT interconnect (VLTi) link. Virtual-link trunk A combined port-channel between an attached device and VLT peer switches. (VLT port-channel) VLT domain The domain includes VLT peer devices, VLT interconnect, and all port-channels in the VLT connected to the attached devices. It is also associated with the configuration mode that you must use to assign VLT global parameters. VLT interconnect (VLTi) The link between VLT peer switches used to synchronize operating states. VLT MAC address (Optional) Unique MAC address that you assign to the VLT domain. A VLT MAC address is the common address used for all VLT peers. If you do not configure a VLT MAC address, the MAC address of the primary peer is used as the VLT MAC address across all peers. VLT peer device A pair of devices connected using a dedicated port-channel - the VLTi. VLT port-channel ID Groups port-channel interfaces on VLT peers into a single virtual-link trunk connected to an attached device. Assign the same port-channel ID to interfaces on different peers that you bundle together. VLT Node Priority The priority based on which the primary and secondary VLT nodes are determined. If priority is not configured, the VLT node with the lowest MAC address is elected as the primary VLT node. VLT peer switches have independent management planes. A VLTi between the VLT chassis maintains synchronization of L2/L3 control planes across the two peer switches. VLT domain A VLT domain includes the VLT peer devices, VLT interconnect, and all port-channels in the VLT that connect to the attached devices. It is also associated with the configuration mode that you must use to assign VLT global parameters. • A VLT domain supports two node members. These peer devices appear as a single logical device to network access devices that connect to VLT ports through a port-channel. • A VLT domain consists of the two core nodes, interconnect trunk, and LAG members that connect to attached devices. • Each VLT domain must have a unique MAC address that you create or that VLT creates automatically. • VLAN ID 4094 is reserved as an internal control VLAN for the VLT domain. • ARP, IPv6 neighbors, and MAC tables synchronize between the VLT peer nodes. • VLT peer devices operate as a separate node with independent control and data planes for devices that attach to non-VLT ports. • One node in the VLT domain takes a primary role and the other node takes the secondary role. In a VLT domain with two nodes, the VLT assigns the primary node role to the node with the lowest MAC address. By default, VLT assigns the primary node role to the node Virtual Link Trunking 715