Datto Networking: Switch FAQ



This article covers Frequently Asked Questions about Datto switches.


Topics Covered:

How can I adjust the bandwidth with Datto Switches? Can I set an overall bandwidth for the whole switch?
The bandwidth on Datto switches can be throttled on an individual port basis using the Rate Limit field to set allowed Receive (Rx) and Transmit (Tx) bandwidth. To set the overall bandwidth, set these values on the uplink port that the switch connects to your router or gateway with.

Does the PoE functionality support the passive PoE standard on the older OM2P-HS APs?
No our switches only support 802.3af PoE, you would need to power non 802.3af devices by power adapter or by passive PoE injector.

How do they communicate with the Cloud Management Page? Do I need to open more ports in my firewall?
The Datto switches use the same ports (80 and 443) as our APs. You may also need to whitelist www.cloudtrax.com and www.AmazonAWS.com as we recommend with our APs.

Are the SFP modules proprietary or can "generic" modules be used?
Generic SFP modules can be used, but we can't support them.

Are the switches capable of Gigabit speeds?
Yes, all ports are 10/100/1000 Mbps capable

I already have switches in my network, but I'd like to start adding some Datto switches to my network as well. Is this possible?
Yes, our switches are compatible with other switches and routers using the standard TCP/IP protocol

Can the switches be daisy chained?
Yes, you can link switches together on the network and maintain speeds using link aggregation.

On the Voice VLAN, does it add devices to this VLAN based on OUI?
When enabled on a port, the Voice VLAN feature allows VLAN tagged on the port and modifies the priority for packets which match the Voice VLAN ID and OUI prefix. Traffic is not automatically tagged. See Voice VLAN for more information.

Are all ports designed as trunk only or can they be individually set as access ports only?
To set a port as an access port, set only the PVID and Untagged VLAN. To have a trunk port allow multiple tagged VLANs.

Are jumbo frames supported?
The hardware is capable, but support for the feature through the Network Management section of the Datto Portal is not currently available. Contact Datto Technical Support for assistance with enabling this feature. 

What provisions are there for bad firmware updates?
Like our APs, our switches use dual partitions for updates, so the existing firmware is not overwritten for an update. If the new firmware install fails, the device will revert to the previously installed firmware.

Can an ACL deny an entire subnet access to a destination, or only by IP?
Yes, you can set ACL by subnet

Are there single-mode SFP's as well?
We sell both single-mode and multi-mode fiber SFP modules.

Are the switching capacity rates and forwarding rates published any where?
Our datasheet on the S-series switches is located on the Partner Portal Product & Pricing Info section.

Does S8 switch have a fan?

How many APs can my switch power?

To answer the question of how many PoE powered devices you can support on a single PoE switch, you need to first consider how much power your PoE devices need, and how much power your switch can provide. 

Client devices today usually support standards based 802.3af or 802.3at PoE power. This means that they can request and draw up to a maximum of 15.4W (af) or 25.5W (at) from the switch port they are connected to. 

For PoE switches you should look for their "PoE Budget" or "Power Dedicated to PoE" value, which is the total amount of power it has available to divide between PoE devices connected to it. 

For example, if you have a switch with a PoE Budget of 45W, and two PoE devices that use the 802.3af standard (max 15.4W), then even if both devices draw their maximum allowed power (15.4 x 2 = 30.8W), there will still be plenty of spare power in the switches PoE budget. 

Now let's take the example a step further. While the two PoE devices use the 802.3af standard, that only defines what the maximum power values are that the device can draw, not the actual amount of power the device will draw. If the device in fact only draws 5W of power during normal operation, then the scenario becomes (5W x 2 = 10W total PoE power draw) much less demanding on the AP, leaving the majority (10W - 45W = 35W) of it's PoE budget available. Information on both the PoE standard used and the normal/expected PoE power draw of your device should be available in the device manufacturer's technical detail pages or data sheets.

A word of caution when planning how many devices to run on one switch. As mentioned above, a device may only draw 5W of power during normal operation, however, that same device may still draw up to it's PoE type maximum (15.W/25.5W) at any time. This possibility can often be seen during times of high activity, such as boot up cycles when first connected or when the device resets. If you plan for your devices to only use 5W and install 10 on a switch with a 55W PoE budget, you may find that only a few of the devices are able to boot back up properly if the switch itself ever loses power, reboots, or other event where all the PoE devices try to power back on at the same time.

Next let's talk about what happens if you find yourself in a situation where the switches PoE budget is maxed out. This can vary based on the manufacturer of your PoE switch and the configuration applied to it. For our switches, PoE power is provided on a priority basis (Low/Medium/High/Critical). This means that if, for example, you have a switch with a 45W PoE budget and 4 PoE client devices that use 15W each all set with a different priority, the device set with a "Low" priority will have it's PoE power re-allocated to supply the device with higher priority. This allows you to ensure that certain devices will never lose power or will always have enough power, even if the switch has already expended it's entire PoE budget.

One last thing to consider is that power draw on a PoE device can fluctuate. The power needed during initial boot-up compared to when the device is idle will often be significantly different. If the manufacturer data sheets do not state a max power draw value for your device, it's generally recommended to assume the device will draw its maximum allowed power during initial boot.

Can I locally access my switch?

No, there is no local access to any Datto switch.

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