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Forum Discussion
JeffAtK2
May 11, 2022Guide
AutoVOIP and CoS Override Mode
Hi, We have a GS752TPv2 and Mitel 6867i phones. We have Auto-VOIP and VoiceVLAN on. Phones are correctly put on vlan 4088. PC ports on the phones correctly go to vlan 1. The phones generally wo...
schumaku
May 25, 2022Guru - Experienced User
Dear Jeff,
Don't mix up L2 QoS fetaures like the CoS tag, defining the queue the frames are handled within the switch and between switches) and the L3 QoS features like DSCP tag which is used as part of the routing process. permitting your router, the Internet provider does allow passing to the VoIP provider, and the VoIP provider taking care of.
It's definitivley not wrong to enable amd configure the CoS override, eg. in case the the VoIP devices are not configured to add these. While adding slightly more load to the switch, it makes it much easier for the management. This allows to send the VoIP traffic to the higher prio queue on the switching core, and the next L2 hop switch, which can bring some advantage over the normal prio L2 network traffic.
Regards,
-Kurt
- JeffAtK2May 25, 2022Guide
Thanks for the info!
So, practically speaking, does that mean that in this example:
... voice traffic from the phone on Interface g36 will be assigned a DSCP value of 46, which according to this table
-- will set its queue at 2, which gives it a higher priority ("Expedited Forwarding")? Would I have to explicitly ensure that VLAN 4088 is also expedited at each node (eg on the links connecting the switch to the router and any switches between them)? Or, once it's marked as "Expedited" all equipment along the path will read this and will give it priority? In short: should I set DSCP to 46 for VLAN 4088 on the uplink ports?
Also, and I right in thinking I should also set the interface trust mode to DSCP since that's what I'm using to shape the traffic?
I'm trying to make sure that my settings are actually accomplishing what I think they are ... to prioritize voice traffic.
Thanks!
Jeff
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