Supported Topology
******************

Trellis supports various topologies, from a single switch to a full multi-stage
leaf-spine fabric.

Simple
======

Single switch
-------------

This is the minimum Trellis setup. In this setup, all servers are connected to
a single switch.

    .. image:: images/install-single.png

Paired switches
---------------

Compared to single switch, it provides more redundancy in terms of server NIC
failure and link failure.

    .. image:: images/install-pair.png

Single-Stage Leaf-Spine
=======================

Without paired switches
-----------------------

Compared to single switch, it offers more redundancy in terms of switch failure
and provides better scalability.

    .. image:: images/install-2x2.png

With paired switches
--------------------

It supports all the redundancy and scalability features mentioned above.

    .. image:: images/install-2x4.png

Multi-Stage Leaf-Spine
======================

Multi-stage is specifically designed for telco service providers.

The first stage can be installed in the central office, while the second stage
can be installed in a field office that is closer to the subscribers.

Two stages are typically connected via long distance optical transport.

    .. image:: images/install-full.png