GS1900 series - understanding QoS, Remark options and Trust Mode
Is there a clear explanation document available on how QoS works on the GS1900 series on both normal untagged ports, tagged ports and trunks?
I am having a network behind an USG60 where the first GS1900-24E has an uplink to one GS1900-8HP for 3 NWA1123-ACv2 and 2 IP cameras, another uplink to one GS1900-8 connected to pc's and a printer and another uplink to a second GS1900-24E on a different floor. On every trunk 4 vlans are transmitted (guest/dmz/lan1/prio), but only lan1 and guest are forwarded to the AP.
Users where forced to start using Jabber client on their phones and started complaining about the voice quality. As they are using Android and iPhone I was unable to implement a voice VLAN and separate it on the OUI and I wanted to implement QoS to raise the priority of the phones.
The NWA1123-ACv2 have been set to WMM in the SSID profile and indeed send the call stream with AF41, but after the first switch the packed has DSCP: CS1 and I do not understand why.
I have played with the different QoS settings capturing packet streams using the mirror function, but am unable to force a different DSCP for streams to/from a single port.
Under the Trust menu option:
Trust Mode: what mode is best used in my configuration? CoS, DSCP or Cos-DSCP? My best guess is DSCP.
Trust/Untrust: does this setting tell the switch to trust or not trust the DSCP level that is send by the device connected to that particular port?
Under the General menu option:
What do the QoS Remark / DSCP Remark / IP Precedence Remark actualy have as an effect when enabled/disabled? Do they rewrite that specific remark to the value entered in the first field?
For an uplink/trunk between two GS1900 devices: what should be set for the QoS?
I hope someone can help me out on these questions?