Users Guide

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 illustration 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.
Figure 146. VLT on Core Switches
Virtual Link Trunking (VLT) 1127