mls qos vs auto qos (issue)

[Wafabewafa]

Hi,

Currently i am running mls qos on existing old switches which needed to be replace. New switch with 15.x doesn't support mls qos..

My current qos setting on access switch are

mls qos map cos-dscp 0 8 16 26 32 46 46 56
mls qos

and on interface

interface FastEthernet0/1
 switchport access vlan 2
 switchport mode access
 switchport voice vlan 3
 priority-queue out
 mls qos trust dscp
 no snmp trap link-status
 storm-control broadcast level 20.00
 storm-control multicast level 20.00
 spanning-tree portfast

On core

mls aging long 300
mls aging normal 120
mls netflow interface
mls flow ip interface-full
mls nde sender
mls qos map cos-dscp 0 8 16 26 32 46 46 56
mls qos

interface

interface Port-channel3
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 2,3
 switchport mode trunk
 mls qos trust dscp

Now my question is what would be my qos setting would be on new switches which is not supported mls qos?

Regards,

WAFA

[Mark Malone]

Whats the new switch model some of the newer platforms are supporting DSCP by default ?

On our setup where mls is not available and not supportiong  by default , we used on access ports where phones were auto qos voip trust and uplinks we used auto qos trust dscp

You need to be careful though some platforms will create class/policy maps automatically when auto qos is being used

[Wafabewafa]

Mark,

New switches are c3650-ps-s  support only auto qos.

I have avaya voip phone and pc on same interface..

Regards,

wafa

[Mark Malone]

Should be on by default check this command for any port , newer switches 3650s, 3850s nexus etc all come with it on by default , if you enable auto qos you will end up with class/policy maps with service policy

show platform qos dscp-cos counters gigabitEthernet x/x

[Wafabewafa]

It is enable see below result  
Ingress DSCP0 0             0
Ingress DSCP1- til-63
Ingress COS0 0             0
Ingress COS1-7
Egress DSCP0
Egress DSCP1-63

My question is does this mean i dont have to configure auto voip class/policy? If i want to configure class/policy  what would be sugesstion as

class-map option regarding dscp ?

policy-map  bandwidth?

policy-map  priority-queue

i was thinking to have class-map for voip

cs4,cs5,cs6,cs7 and ef

and policy map with bandwidth % on each class dscp?

not sure how to set policy-map priority-queue ?

[Mark Malone]

If you just want your switch to trust the dscp markings that the phone sends then no you dont have to do anything as its on by default , to confirm set a wireshark on your switch you should see each of the packets coming from the phone marked as EF , if you want to manipulate and use specific queuing then you can deploy auto qos or deploy manual class/policy maps with specific queuing , both contained in doc below, qos does not trust on egress by default as far as i remember its ingress only but you can use the command provided previously to check

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/3se/qos/configuration_guide/b_qos_3se_3650_cg/b_qos_3se_3650_cg_chapter_011.html