Users Guide

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 shown in

the following figure.

Figure 9. Type 4: Small Distributed Core Fabric Design

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

• 16 ports of fabric interlink (fabric links) port capacity to the spine (10 GB)

• 48 Ethernet downlinks (10 GB)

• 60 Ethernet ports for servers per node and WAN connectivity (10 GB)

VLT

Virtual link trunking (VLT):

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

• Eliminates ports blocked due to Spanning Tree Protocol (STP)

• Provides a loop-free topology

• Uses all available uplink bandwidth

• Provides fast convergence if either the link or a device fails

• Optimized forwarding with Virtual Router Redundancy Protocol (VRRP)

• Provides link-level resiliency

• Assures high availability

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 provides Layer 2 multipathing, creates

redundancy through increased bandwidth, and enables multiple parallel paths between nodes and load-

balancing traffic where alternative paths exist. VLT reduces the role of STP:

• by allowing LAG terminations on two separate distribution or core switches

Supported Fabric Types