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With a Type 4: Small Distributed Core fabric design, the S4810 spines connect to the S4810 leaves at a fixed 10 Gb. The

maximum number of spines is 4 and the maximum number of leaves is 16, as show in the following figure.

Figure 8. Type 4: Small Distributed Core Fabric Design

Each S4810 leaf for the Type 4: Small Distributed Core design has the following:

• Sixteen 10 Gigabit of fabric interlink (fabric links) port capacity to the spine

• Forty–eight 10 Gig Ethernet downlinks

• Sixty 10 Gig Ethernet ports for servers per node and WAN connectivity

VLT

Virtual link trunking (VLT) allows physical links between two chassis to appear as a single virtual link to the network core

or other switches such as Edge, Access or Top of Rack (ToR). VLT reduces the role of Spanning Tree protocols by

allowing LAG terminations on two separate distribution or core switches, and by supporting a loop free topology. (A

Spanning Tree protocol is needed to prevent the initial loop that may occur prior to VLT being established. After VLT is

established, RSTP may be used to prevent loops from forming with new links that are incorrectly connected and outside

the VLT domain.) VLT provides Layer 2 multipathing, creating redundancy through increased bandwidth, enabling

multiple parallel paths between nodes and load-balancing traffic where alternative paths exist.

For information about VLT, see the FTOS Configuration Guide for either the S4810, S6000, or the Z9000 at https://

www.force10networks.com/CSPortal20/KnowledgeBase/Documentation.aspx. For more information about VLT, see

Selecting a Layer 2 and Layer 3 with Resiliency (Routed VLT) Fabric Design.

Virtual link trunking offers the following benefits:

• Allows a single device to use a LAG across two upstream devices

• Eliminates Spanning Tree protocol (STP) - blocked ports

• Provides a loop-free topology

• Uses all available uplink bandwidth

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