iam configuring L3 switches where 2-3750 and 3560 switches are there 3750 is my core switch with whom 3560 are connected as client (vtp) i need to configure Voice and data vlan which should be working on each single port of 3560 and also where should i configure QOS whether on 3750 or 3560.
Yes u can configure a signle switchport to both data & voice.
Lets say data vlan is 50 & voice vlan is 100. Then config on switchport looks like this:
swithcport access vlan 50
switchport voice vlan 100
By default, pkts from data vlan are untagged while voice pkts are tagged by the IP phone itself. Any pkt tagged with QoS value looses its QoS value when it need to cross that switch. Thus you need to have a command "mls qos trust" on all access ports to which IP phones are conected. Also need to have this comand on trunk ports, as this makes the switch to pass the pkt to anothr device while retaining its attributes.
Pls note that within a LAN pkts are marked with COS values, if you need the pkts to travel WAN with QoS then you need to translate the COS values to DSCP.
I use the swiches webinterface to configure the ports, you just have to tell what port is Data+VoIP and the vlans used for that. The rest will be done by the macros (you can use the macro in the cli as well)
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