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vlan based qos configuration

feisalb
Level 1
Level 1

Hello All

I have a customer network that has vlan based qos on the network. On the access switches they have MQC configured and the service policy

on the vlan interface. They have mls qos vlan based command  on the access ports but not on any of the trunk interfaces that are in the network.

There are 2 switches between the access switch and the connection to the layer 3 device.

I have currently configured mls qos trust dscp on the trunk interface along the path to the layer 3 device. Should I change this to mls qos vlan based on the trunks? The command wasn't there before so I didn't change it as Cisco phones where working.

This all came about as we had skype for business testing within a singe switch and vlan and we could see in wireshark that packets were being marked by the pc on egress but the receiving pc was seeing the incoming marking as dscp 0. To get it to work I change the port from vlan based to mls qos trust dscp and the port was in a trust state. I don't want to do this unless necessary but why would vlan based config change dscp to 0?

interface FastEthernet0/47
description ***
switchport access vlan 628
switchport mode access
switchport voice vlan 728
speed 100
duplex full
queue-set 2
priority-queue out
mls qos trust device cisco-phone
mls qos vlan-based
no snmp trap link-status
spanning-tree portfast

interface FastEthernet0/33

switchport access vlan 628
switchport mode access
switchport voice vlan 728
speed 100
duplex full
queue-set 2
priority-queue out
mls qos vlan-based
no snmp trap link-status
spanning-tree portfas

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q
switchport trunk allowed vlan 328,628,728,928
switchport mode trunk
ip arp inspection trust
priority-queue out
mls qos trust dscp
ip dhcp snooping trust

interface Vlan628
no ip address
service-policy input DATA-QOS
!
interface Vlan728
no ip address
service-policy input PHONE-QOS

class-map match-all DVLAN-any
match access-group 161
class-map match-all SK4B_SIP_Signalling
match ip dscp cs3
class-map match-all VVLAN-any
match access-group 161
class-map match-any voice-control
match ip dscp cs3 af31 af32 af33
class-map match-all Finesse
match ip dscp af31
class-map match-all SK4B_SharedContent
match ip dscp af21
class-map match-all SK4B_Video
match ip dscp af41
class-map match-all SK4B_Audio
match ip dscp ef
class-map match-all voice
match ip dscp ef
class-map match-all DATA-CTIos
match access-group 160
!
!
policy-map PHONE-QOS
class voice
set dscp ef
class voice-control
set dscp af31
class VVLAN-any
set dscp default
policy-map DATA-QOS
class DATA-CTIos
set dscp af31
class DVLAN-any
set dscp default
class SK4B_Audio
set dscp ef
class SK4B_Video
set dscp af41
class SK4B_SIP_Signalling
set dscp cs3
class SK4B_SharedContent
set dscp af21
class Finesse
set dscp af31

Thanks for you assistance

Feisal

0 Replies 0
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