Networking an ETC Ion with one network port

Using a switch should work without a problem. Mainly the quality of the switch can cause some problems with multicast.
You should use a managed high quality switch, set IGMP snooping on and activate the spanning tree protocol.

sstaub said:

set IGMP snooping on and activate the spanning tree protocol.

Isn't this a bit OverPower for this setup?

Especially the Spanning Tree?

No, this is necessary when you use more than one switch in the system.
- IGMP snooping forwards the Multicast groups, which are used for sACN, to the other switches
and also looks for wrong multicast traffic.
- Spanning Tree is useful to avoid loops in the the network system which can crash the whole system.
This can happen when there is a wrong patch connection.

In this case it is not clear which network infrastructure is present.

Spanning tree (so long as it is Rapid (RSTP)) is never overkill. It should always be enabled.

IGMP can be overkill on small networks, it could also cause unexpected issues in the wrong hands.
Case in point, you would also need an IGMP querier in the system when IGMP snooping is enabled.

My rule of thumb is:

• < 10 universe no need for IGMP

• > 10 universes consider using IGMP

Spanning tree (so long as it is Rapid (RSTP)) is never overkill. It should always be enabled.

IGMP can be overkill on small networks, it could also cause unexpected issues in the wrong hands.
Case in point, you would also need an IGMP querier in the system when IGMP snooping is enabled.

My rule of thumb is:

• < 10 universe no need for IGMP

• > 10 universes consider using IGMP

marcusbirkin  You are right but most Layer 2 switches subsume under IGMP Snooping also the IGMP Querier functionality. On Layer 3 switches it can configured separate. 

As a location of a IGMP Querier can be critical, this feature is oftern unrequired on edge switches.
Many edge (and popular cheap) switches do not include an IGMP Querier.
A notable, popular and cheap, switch of example would be [at least some of] the Netgear prosafe range

Yes, the cheap switches can cause many problems, so I replaced my Netgear with Aruba 19xx and 25xx.
I don't understand people how uses consoles for thousands of Dollars/Euros and use a $20 network switch, and crying that the system are not working as expected.
I have planned a large ETC System in Munich 2008 with 35 Net3 nodes, 4 Sensor dimmers with doubled processors. I used 3 HPE 25xx switches which cost about € 6000.- at that time, but they work until now in 24/7 without problems.

The arts is cash strapped, not every theatre can afford, or need, to spend $$$$ (€€€€/££££) on equipment.

Expensive or cheap equipment can used incorrectly and not every one has the networking skill to resolve this. Thus why even cheap unmanaged switches have a use.

I think if you own a console for e.g. € 10.000.- you will have also the € 300.- for a high quality managed switch.

You both made you point clear.
Thank you very much.

I am grateful for your advise and knowledge. 

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If we dive any deeper, i think we will slightly go off-topic and explode the Thread.