Sonos uses non-standard STP path costs, which is problematic for advanced implementations. Request for an update to leapfrog compliant STP path costs and support RSTP.
Feature request: support RSTP
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Thank you - I've marked this thread as a feature request and it will be seen by the relevant teams for consideration. Keep the ideas coming!
@Corry P - thanks for your reply & confirmation that it’s been tagged properly.
But! This is a well-documented and long-running problem. Any cursory search of the Internet with the terms RSTP, Sonos, and - very frequently - Ubiquiti, will yield multiple posts that go back years, with no end of technical documentation about workarounds.
If there’s any way for the Sonos staff to put together a statement of yes, it’s coming, or no, it’s not anywhere near, that would be great. And, if it’s not coming, maybe a best practices document for setting up networks would be fantastic.
Thanks, Jeff (frustrated Sonos customer...)
We rarely comment on the development of upcoming features, nor on their expected availability dates. All I can say is that the request has been noted and someone will consider it - though of course it’s entirely possible that it was considered long ago and there are reasons why it’s not yet implemented. I just don’t know, as I’m not in the loop either.
Regarding STP and RSTP, I can provide the following:
General Cisco Managed Switch Settings
These are settings that were configured for a Cisco SG300-52 managed switch that played the role of the Root Bridge for the Sonos network. Even while the following parameters are derived from the SG300-52 settings, they may be adapted to switch hardware of other vendors, too.
STP Interface Settings:
For each network port with a player being connected, the following settings apply:
All other network devices that don't participate in the Sonos player spanning tree may be set up like this:
Typically "STP: Enable" or "STP: Disable" *do* work for all non Sonos ports.
Cisco does not suggest disabling the STP option on single switch ports because "non-network experienced people" may use those ports and then have difficulty diagnosing loop and broadcast storm issues quickly.
IGMP snooping should be enabled with Multicast filtering enabled, to lower the overall network load.
Make sure that your router provides support for Multicast traffic pass through and has implemented an IGMP querier - e.g. IGMP v2 compatible.
You don't have to elect an available IGMP querier by yourself. This will be done by the Multicast handling network devices (router, switches) automatically.
Concerning the Cisco SG300-52 switch hardware it's absolutely essential that you disable (and apply) the "Spanning Tree State" after you've done changes to the "STP Interface Settings" and enable (and apply) "Spanning Tree State" again, or the spanning tree won't be rebuilt and run correctly.
Here are the settings of a CISCO SF-200-24 with almost the same STP Settings:
*The Sonos Root Bridge has the Bridge Priority 8000 anything with a lower value as in this example the switch with 4096 will take over the role of the Sonos Root Bridge, this makes sense when more than 50 % of the devices are wired to this switch the default value is 32768
This Sonos forum post is an excellent supplement to further explain how Sonos devices work with STP configurable switches on a network. https://en.community.sonos.com/troubleshooting-228999/sonos-and-the-spanning-tree-protocol-16973
And regarding Ubiquiti, I can provide the following:
I hope this helps.
Your Ubiquiti/Unifi instructions are regarding wireless, which is irrelevant to RSTP/STP.
Howerver, the solution for STP broadcast storms and loops on Ubiquiti Unifi switches is really simple. Leave RSTP on but disable STP on every port that sonos equipment is wired to. It’s really that simple.
While the above instructions work, Sonos should really get with the 21st century and support RSTP. RSTP is backwards compatible with STP, so as long as you have engineers who know what they are doing, it should be no big deal. With other network switches where you can’t turn off STP on individual ports (such as Cisco, etc) you have to use a complete STP setup, which is very outdated and has a lot of drawbacks.