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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 144. VLT on Core Switches
Multiple VLT
A multiple VLT (mVLT) conguration allows two dierent VLT domains connected by a standard LACP LAG to form a loop-free Layer 2
topology in the aggregation layer.
This conguration supports a maximum of four (4) units, increasing the number of available ports and allowing for dual redundancy of the
VLT. The following illustration shows how the core/aggregation port density in the Layer 2 topology is increased using mVLT. For inter-
VLAN routing and other Layer 3 routing, a separate Layer 3 router is required.
Virtual Link Trunking (VLT)
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