Reference Guide

950 | Virtual Link Trunking (VLT)
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As shown in the following figure, VLT presents a single logical Layer 2 domain from the perspective of
attached devices that have a virtual link trunk terminating on separate chassis in the VLT domain.
However, the two VLT chassis are independent Layer2/Layer3 (L2/L3) switches for devices in the
upstream network. L2/L3 control plane protocols and system management features function normally in
VLT mode. Features such as VRRP and IGMP Snooping require state information to be coordinated
between the two VLT chassis. IGMP and VLT configurations must be identical on both sides of the trunk
to ensure the same behavior on both sides.
This figure shows VLT deployed on S5000 switches. The S5000 switches appear as a single virtual switch
from the point of view of the switch or server supporting LACP.
Figure 55-1. Virtual Link Trunking on S5000 Switches
Caution: Dell Networking recommends not enabling Stacking and VLT
simultaneously. If both are enabled at the same time, unexpected behavior will occur.