Reference Guide

990 | Virtual Link Trunking (VLT)
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This figure shows VLT deployed on S4810 switches. The S4810 switches appear as a single virtual switch
from the point of view of the switch or server supporting LACP.
Figure 53-361. Virtual Link Trunking on S4810 Switches
VLT on Core Switches
VLT can also be deployed 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 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.
VLT Domain
S4810
Chassis
S4810
Chassis
Virtual Link
Trunk
Interconnect
Backup
Link
Virtual Link Trunk
Switch or Server that supports LACP (802.1ad)
Out-of-Band
Management
Network
s
O
ut-of-Band
Mana
g
ement
N
e
tw
o
rk
Backup
Link