Vlt On Core Switches; Enhanced Vlt - Dell Force10 Z9000 Configuration Manual

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Figure 113. VLT on Switches

VLT on Core Switches

You can also deploy VLT on core switches.

Uplinks from servers to the access layer and from access layer to the aggregation layer are bundled in LAG groups with end-to-end

Layer 2 multipathing. This set up requires "horizontal" stacking at the access layer and VLT at the aggregation layer such that all the

uplinks from servers to access and access to aggregation are in Active-Active Load Sharing mode. This example provides the highest

form of resiliency, scaling, and load balancing in data center switching networks.

The following example shows stacking at the access, VLT in aggregation, and Layer 3 at the core.

The aggregation layer is mostly in the L2/L3 switching/routing layer. For better resiliency in the aggregation, Dell Networking

recommends running the internal gateway protocol (IGP) on the VLTi VLAN to synchronize the L3 routing table across the two

nodes on a VLT system.

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 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 units, 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 and other Layer 3 routing, you need a separate Layer 3 router.

Virtual Link Trunking (VLT)