Users Guide

Figure 145. Virtual Link Trunking on S5000 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 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.
916
Virtual Link Trunking (VLT)