Enhanced Vlt; Vlt Concepts Terminology - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Enhanced VLT

An enhanced VLT (eVLT) configuration creates a port channel between two VLT domains by allowing

two different VLT domains, using different VLT Domain ID numbers, connected by a standard LACP

LAG to form a loop-free Layer 2 topology in the aggregation layer. This configuration supports a

maximum of four (4) nodes per eVLT domain, increasing the number of available ports and allowing for

dual redundancy of the VLT.

Additionally, a VLT domain that is a member of one eVLT can be used in another eVLT configuration

with a different VLT domain. Routing protocols such as OSPF are not compatible with eVLT; however,

VLT domains can be used for routing. A separate Layer 3 router is not required for inter-VLAN

communication.

The following figure shows how the core/aggregation port density in the Layer 2 topology is increased

using eVLT. For inter-VLAN routing and other Layer 3 routing, a separate Layer 3 router is required.

The following are some key VLT terms.

Virtual link trunk (VLT) - The combined port channel between an attached device and the VLT peer

VLT backup link - The backup link monitors the vitality of a VLT peer switch. The backup link sends

configurable, periodic keep alive messages between VLT peer switches.

VLT interconnect (VLTi) - The link used to synchronize states between the VLT peer switches. Both

ends must be on 10Gor 40G interfaces.

Virtual Link Trunking (VLT) | 1065