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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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Enhanced VLT

Enhanced VLT (eVLT)) refers to the ability to connect two VLT domains. An 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 link aggregation control protocol (LACP) LAG to form a loop-free Layer 2 topology in the aggregation layer.

This configuration supports a maximum of four switches, increasing the number of available ports and allowing for dual redundancy of the VLT. The following example shows how the core/aggregation port density in the Layer 2 topology is increased using eVLT. For inter-VLAN routing, you do not need a separate router.

If you enable peer routing in an eVLT topology, a VLT node acts as a proxy gateway for its peer within the VLT domain. You can also configure the two VLT domains to act as proxy gateways for each other. For more details, see the VLT Proxy Gateway chapter.

Figure 1. Enhanced VLT
Illustration of enhanced VLT.

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