DANTE configuration on ISR 921-4P router & SG250 switches

[ben.r.fr]

Hello,

I have two SG250 switches configured for DANTE features which are the QoS (map dscp-queue 46 to 4 & 56 to and EEE disable.
These two switches manage different vlans.
One vlan on each switch needs to communicate through the DANTE. They are connected by a trunk port on a ISR 921-4P router.

My question is on the ISR 900 series (921-4P) router :
- I don't find the path to desable EEE ?
- I don't find the path to enable the QoS recommanded by Audinate for DANTE on the switch part of the 921-4P ?

Is someone can help me to fix that please ?

In advance thank you for your answers
Ben

[Georg Pauwen]

Hello,

I have looked around quite extensively, I don't think these options are there for the ISR 921...

[ben.r.fr]

hello @Georg Pauwen, thank you very much.

- Do you think this could be a problem for the transport of DANTE packets which pass through this one (921-4P) to go from one switch to another?
- Or would the DANTE configuration on the switches suffice?

Benjamin

[Georg Pauwen]

Hello,

DANTE uses layer 3 packets, so some sort of layer 3 QoS needs to be done. Check the link below and try to find out which ports are being used in your specific case, we can then build a QoS policy:

https://www.audinate.com/learning/faqs/which-network-ports-does-dante-use

[ben.r.fr]

Ok I understand better and will work in this direction.

- Is this configuration option available on the 921-4P?

[Georg Pauwen]

Hello,

what configuration option are you referring to ? QoS ?

[ben.r.fr]

Hello @Georg Pauwen, Yes sorry, the QoS policy configuration you mentioned above about using ports on layer 3 of the 921-4 ?

Benjamin

[Georg Pauwen]

Hello,

definitely, the 921 has extensive layer 3 QoS options. Have you found out which ports your specific apps are using ?

[ben.r.fr]

Hello,

ok thank you very much.

No, I think I don't quite understand all the information I have on the link you gave me and I'm researching it.

I will be in physics to check directly on the affected devices next week, Thursday. And would test with common Linux commands, netsat and/or others.

Would you say this is a good direction to determine my DANTE ports usage?

(At the moment, one of the two Vlans that use DANTE does not come out of the LAN (maybe in the future) but the second one does.)

Benjamin

[Georg Pauwen]

Hello,

'netstat' and 'ss' are two Linux options to check for open ports and sockets. Definitely a good starting point. Basically what we want is find out which ports are being used, and then prioritize traffic that uses these ports...

[ben.r.fr]

hello,

yes ok, i will do that and tell you for my next step.

I will also deploy a VPN in the near future to more easily connect to the work network.

Nice weekend and thank you again for your time and tips.

Benjamin

[Georg Pauwen]

Hello,

DANTE uses the general web TCP ports 80 and 443 as well, so in order to really prioritize only DANTE traffic, we would need to find out which additional ports are being used, and then tune the QoS so that only traffic that matches DANTE and not web traffic is being prioritized. 

[ben.r.fr]

Hello,
I have identified my ports used for DANTE and at the moment, as the main DANTE Vlan stays inside the main LAN, I am not using ports 80 and 443 but rather the general DANTE ports.

Since the network rollout, users have reported high latency issues when opening audio applications such as Reaper and Ableton Live software and I'm having trouble understanding why?
When the device is disconnected from the network, the audio software in question starts almost immediately.

- Is it because the ISR 921-4P needs its QoS configuration to normally route all network packets through the switches?

- Is it necessary to provide for the opening on the Internet network for the use of ports 80 and 443 or others?

On the switches the QoS configuration i need is for CS7 as 8, CS 1 as 1, EF as 4 and none BestEffort.

Benjamin

[Georg Pauwen]

Hello,

I am curious if QoS actually is the solution, as this would only apply if there is interface congestion. Can you post the output of:

sh interfaces x

where 'x' are the layer 3 interfaces the traffic is flowing through ?

[ben.r.fr]

yes ok, thank you, I'll give you this output asap tomorrow morning