Vlt On Core Switches - Dell C9000 Series Networking Configuration Manual

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The following example shows how VLT is deployed. The switches appear as a single virtual switch from the

point of view of the switch or server supporting link aggregation control protocol (LACP).

Figure 145. Example of VLT Deployment

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.

Virtual Link Trunking (VLT)