Dell S4048T User Manual

The following example shows how VLT is deployed. The switches appear as a single virtual switch from the
point of view of the switch or server supporting link aggregation control protocol (LACP).
Figure 139. Example of VLT Deployment
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 example 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.
Virtual Link Trunking (VLT) 1115

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)