DSCP/Prec Marking Cisco 3750x

[NetDevOp]

Hey Everyone,

I have been looking to mark all traffic in a single vlan as EF on a 3560x switch.  Here is the config I am using but a 'show policy-map int vlan912' shows 0 hits on neither the voip class or class default.  Any suggestions?

!
! Matching and marking all traffic in the VOIP VLAN:
ip access-list ext VOIP_ACCESS
permit ip any any
!
class-map match-any VOIP_MAP
description voip
match access-group name VOIP_ACCESS
!
policy-map MARKING_POLICY
class VOIP_MAP
set dscp ef
set precedence 5
!
int Vl912
service-policy input MARKING_POLICY
!

SWITCH#show vers
Cisco IOS Software, C3560E Software (C3560E-UNIVERSALK9-M), Version 15.2(2)E, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Thu 26-Jun-14 17:15 by prod_rel_team

ROM: Bootstrap program is C3560E boot loader
BOOTLDR: C3560E Boot Loader (C3560X-HBOOT-M) Version 12.2(58r)SE1, RELEASE SOFTWARE (fc1)

SWITCH uptime is 1 year, 13 weeks, 3 days, 5 hours, 0 minutes
System returned to ROM by power-on
System restarted at 21:27:30 EDT Tue Mar 29 2011
System image file is "flash:c3560e-universalk9-mz.152-2.E.bin"
Last reload reason: Unknown reason

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License Level: ipservices
License Type: Permanent
Next reload license Level: ipservices

cisco WS-C3560X-24 (PowerPC405) processor (revision A0) with 262144K bytes of memory.

[Jonathan Unger]

Hi There,

You may have just made a typo, but your show command is referencing a different VLAN than the configuration.

'show policy-map int vlan191'

int Vl912
service-policy input MARKING_POLICY

Can you confirm whether you are using the VLAN in the show command to check your stats?

[NetDevOp]

Thanks Jonathan, the show command above was a typo.  I had been testing a couple of different switches so it got mixed up.  Using the config example from above, 'show policy-map int vlan912' shows 0's on a traffic counters.

[NetDevOp]

Set up another test and used a policy-map in a second router to monitor QoS classes and verified the marking is actually taking place.  The counters must be an IOS bug.

I also verified the vlan-based command is needed on any host ports where the dscp must be re-marked:

!
interface GigabitEthernet0/10
description test host
switchport access vlan 912
switchport mode access
mls qos vlan-based