You will want to place these on the phone facing interfaces, not the switch to switch connections. By default, the switch is in trust mode, so it will keep the value when received on the Trunk interface connecting the switches together.
Good evening everyone ! I am new here and I am looking for help. We set up a very simple telephone system in our office, with an external service provider. The phones and the PABX (IPBX) are connected on the switch in port access VLAN 10 simple: no LLPD MED, no TAG, no VOICE VLAN etc ... (I know - this is not the best solution - but I did not choose – it’s a provider’s solution.. by the way). We have totaly 3 DELL switches: N3048P, 6248P and 5524P. The VOIP provider has asked that the VLAN 10 (the voice vlan) be prioritized over the entire network. Our PCs and servers are also in access mode on the VLAN 20 (data). We also have a management VLAN 1. I am looking for a simple configuration to prioritize the VLAN 10 in COS 6 .. or another solution so that it can be prioritized over the VLAN 20 (DATA). Knowing well the range of 5524P switch, I set up the following configuration, which works pretty well - test done with Wireshark:   qos advancedip access-list extended VOIPpermit ip any anyexitclass-map TOIPmatch access-group VOIPexitpolicy-map TOIPclass TOIPset cos 6 interface gigabitethernet1/0/1description IPBXspanning-tree portfastservice-policy input TOIPswitchport access vlan 10 interface gigabitethernet1/0/24description TRUNK_SWITCHspanning-tree portfastservice-policy input TOIPswitchport mode trunk spanning-treespanning-tree mode RSTP qos basicqos trust coseee enable By cons I am a little lost on the 6248P and N3048P, which have a different CLI. I tried to put this configuration, but I'm afraid it is a little weak and it does not fulfill its mission well: [IMAGE] Do you have any suggestions or solutions so that my QOS rules can be homogeneous across the network? I know you're going to talk about changing settings and switching to the VOICE VLAN that "does the job all by myself", but I'm unfortunately forced to stay in that configuration. I thank you ALL in advance for any help or advice you could bring me. Very good evening. Rider641
QOS on N3048P, 6248P and 5524P