Question

Verifying CISCO Catalyst DSCP Values

Asked by: Baran711

i am trying a simple test and banging my head against the wall. basically as a test i am trying to mark all http traffic as dscp ef. i realize the priority is overly high etc but basically i dont think the packets are being marked. please look at my config and let me know what i can do to verify this

!
class-map match-any WEB
 match access-group 101
!
!
policy-map WEB
 class WEB
  set ip dscp ef
!
!
interface GigabitEthernet0/6
 description ESX-Team Member 1
 switchport mode access
 no cdp enable
 channel-group 1 mode on
 service-policy input WEB
!
interface GigabitEthernet0/7
 description ESX-Team Member 2
 switchport mode access
 no cdp enable
 channel-group 1 mode on
 service-policy input WEB
!

access-list 101 permit tcp any any eq www

when i do:

PSC-Switch#sh policy-map interface gi0/6
 GigabitEthernet0/6

  Service-policy input: WEB

    Class-map: WEB (match-any)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: access-group 101
        0 packets, 0 bytes
        5 minute rate 0 bps

    Class-map: class-default (match-any)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: any
        0 packets, 0 bytes
        5 minute rate 0 bps

i have read that the command is unsupported, so i am not overly concerned with the fact that the packets are zero. but when i do a:

sh mls qos int gi0/6 stat
sh mls qos int gi0/7 stat

the dscp values for ef are not incremented, even when i send web traffic to and from the port. am i checking it the wrong way or is this not working?

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Asked On
2009-07-02 at 07:50:32ID24539773
Topics

Voice Over IP

,

Network Switches & Hubs

,

Network Routers

Participating Experts
1
Points
500
Comments
22

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Answers

 

by: kenboonejrPosted on 2009-07-02 at 07:54:55ID: 24764027

I noticed you have an etherchannel setup.  Did you add the service policy to the port channel interface that was created as a result of the etherchannel setup?

 

by: Baran711Posted on 2009-07-02 at 07:59:13ID: 24764083

QoS: policymap is supported on physical, VLAN, and ES interfaces only

while that may be relevant here, this latest attempt was out of desperation. i have tried this on non port channel interfaces with the same result. i am either marking this wrong or trying to verifiy it wrong i think. it hasnt been an isolated incident.

 

by: kenboonejrPosted on 2009-07-02 at 08:04:49ID: 24764152

I have run into this more than once on routers.  Where I wasn't seeing the traffic that I was supposed to see in qos policies like you have.  It turned out to be IOS related.  If you haven't yet upgrade your IOS to the latest version for the switch.  Just a thought.

 

by: Baran711Posted on 2009-07-02 at 08:09:06ID: 24764213

i am currently running the latest ios. i have similar class maps on the router and they are fine if i do the marking there. not sure why it doesnt mark on the switch though.

 

by: kenboonejrPosted on 2009-07-02 at 11:30:28ID: 24766215

Hey I think I know what might be your problem.

You did a permit tcp any any eq www

so this is tcp any source any dest with a destination port of 80

But you specified this as an input policy map.  It looks like you have ESX servers there so I am assuming that the web servers are on those ports.

So the traffic you will see coming input will be source of ESX with a SOURCE port of 80 and destination of the client with a destination port of random.  You see what I mean.

You may need to make the acl  tcp any eq www any if my assumptions are correct.

 

by: Baran711Posted on 2009-07-02 at 14:40:15ID: 24767968

i tried the new acl, i even currently have access-list 101 permit ip any any

the counters still dont increment! what is so weird si that the dscp ef count is 102 still. i have no clue what the 102 packets were in the first place since i cant make that increase past 102 no matter what i do!

 

by: Baran711Posted on 2009-07-02 at 14:42:39ID: 24767996

check this out, according to this none of the interfacs have recieved packets except for the vlan they belong to:

PSC-Switch#sh int stat
Vlan1
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor       8417     661826       3773     639502
             Route cache          0          0          0          0
                   Total       8417     661826       3773     639502
GigabitEthernet0/1
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0        788      50432
             Route cache          0          0          0          0
                   Total          0          0        788      50432
GigabitEthernet0/2
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0          0          0
             Route cache          0          0          0          0
                   Total          0          0          0          0
GigabitEthernet0/3
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0          0          0
             Route cache          0          0          0          0
                   Total          0          0          0          0
GigabitEthernet0/4
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0      18531    1185984
             Route cache          0          0          0          0
                   Total          0          0      18531    1185984
GigabitEthernet0/5
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0       1508      96512
             Route cache          0          0          0          0
                   Total          0          0       1508      96512
GigabitEthernet0/6
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0       3106     198784
             Route cache          0          0          0          0
                   Total          0          0       3106     198784
GigabitEthernet0/7
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0       3106     198784
             Route cache          0          0          0          0
                   Total          0          0       3106     198784
GigabitEthernet0/8
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0        526     207344
             Route cache          0          0          0          0
                   Total          0          0        526     207344
Port-channel1
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0      15452     988928
             Route cache          0          0          0          0
                   Total          0          0      15452     988928
PSC-Switch#
PSC-Switch#
PSC-Switch#
PSC-Switch#
PSC-Switch#sh int stat
Vlan1
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor       8465     664826       3812     645779
             Route cache          0          0          0          0
                   Total       8465     664826       3812     645779
GigabitEthernet0/1
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0        807      51648
             Route cache          0          0          0          0
                   Total          0          0        807      51648
GigabitEthernet0/2
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0          0          0
             Route cache          0          0          0          0
                   Total          0          0          0          0
GigabitEthernet0/3
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0          0          0
             Route cache          0          0          0          0
                   Total          0          0          0          0
GigabitEthernet0/4
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0      18550    1187200
             Route cache          0          0          0          0
                   Total          0          0      18550    1187200
GigabitEthernet0/5
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0       1508      96512
             Route cache          0          0          0          0
                   Total          0          0       1508      96512
GigabitEthernet0/6
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0       3111     199104
             Route cache          0          0          0          0
                   Total          0          0       3111     199104
GigabitEthernet0/7
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0       3111     199104
             Route cache          0          0          0          0
                   Total          0          0       3111     199104
GigabitEthernet0/8
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0        527     207742
             Route cache          0          0          0          0
                   Total          0          0        527     207742
Port-channel1
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0      15472     990208
             Route cache          0          0          0          0
                   Total          0          0      15472     990208
PSC-Switch#

this is my first qos deployment, it just seems fundamentally broken =)

 

by: kenboonejrPosted on 2009-07-02 at 14:43:33ID: 24768005

What model of switch is this?

 

by: Baran711Posted on 2009-07-02 at 14:53:03ID: 24768084

I have tried this on a 3750e and a 2960g.

 

by: Baran711Posted on 2009-07-02 at 14:55:48ID: 24768113

is there a debug command that will allow me to see packets with the dscp value? I have seen a lot about setting up qos but very little reg verifying it

 

by: kenboonejrPosted on 2009-07-02 at 15:03:18ID: 24768184

do this:

show mls qos

qos is disabled by default on a 3750.

 

by: Baran711Posted on 2009-07-02 at 15:08:50ID: 24768220

I did enable it. I will get the output for you when I am back at my desk

 

by: Baran711Posted on 2009-07-02 at 17:28:49ID: 24769054

ok a few things:
PSC-Switch#sh mls qos
QoS is enabled
QoS ip packet dscp rewrite is enabled

i blew away my qos config and did an autoqos voip cisco phone on the 2 ports. i have the same results here is the relevent config and output. it seems like even ciscos cookie cutter config shows the same results. can anyone verify that the commands i am running to try to show traffic work for them?

autoqos config:

mls qos map policed-dscp  24 26 46 to 0
mls qos map cos-dscp 0 8 16 24 32 46 48 56
mls qos srr-queue input bandwidth 90 10
mls qos srr-queue input threshold 1 8 16
mls qos srr-queue input threshold 2 34 66
mls qos srr-queue input buffers 67 33
mls qos srr-queue input cos-map queue 1 threshold 2 1
mls qos srr-queue input cos-map queue 1 threshold 3 0
mls qos srr-queue input cos-map queue 2 threshold 1 2
mls qos srr-queue input cos-map queue 2 threshold 2 4 6 7
mls qos srr-queue input cos-map queue 2 threshold 3 3 5
mls qos srr-queue input dscp-map queue 1 threshold 2 9 10 11 12 13 14 15
mls qos srr-queue input dscp-map queue 1 threshold 3 0 1 2 3 4 5 6 7
mls qos srr-queue input dscp-map queue 1 threshold 3 32
mls qos srr-queue input dscp-map queue 2 threshold 1 16 17 18 19 20 21 22 23
mls qos srr-queue input dscp-map queue 2 threshold 2 33 34 35 36 37 38 39 48
mls qos srr-queue input dscp-map queue 2 threshold 2 49 50 51 52 53 54 55 56
mls qos srr-queue input dscp-map queue 2 threshold 2 57 58 59 60 61 62 63
mls qos srr-queue input dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31
mls qos srr-queue input dscp-map queue 2 threshold 3 40 41 42 43 44 45 46 47
mls qos srr-queue output cos-map queue 1 threshold 3 5
mls qos srr-queue output cos-map queue 2 threshold 3 3 6 7
mls qos srr-queue output cos-map queue 3 threshold 3 2 4
mls qos srr-queue output cos-map queue 4 threshold 2 1
mls qos srr-queue output cos-map queue 4 threshold 3 0
mls qos srr-queue output dscp-map queue 1 threshold 3 40 41 42 43 44 45 46 47
mls qos srr-queue output dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31
mls qos srr-queue output dscp-map queue 2 threshold 3 48 49 50 51 52 53 54 55
mls qos srr-queue output dscp-map queue 2 threshold 3 56 57 58 59 60 61 62 63
mls qos srr-queue output dscp-map queue 3 threshold 3 16 17 18 19 20 21 22 23
mls qos srr-queue output dscp-map queue 3 threshold 3 32 33 34 35 36 37 38 39
mls qos srr-queue output dscp-map queue 4 threshold 1 8
mls qos srr-queue output dscp-map queue 4 threshold 2 9 10 11 12 13 14 15
mls qos srr-queue output dscp-map queue 4 threshold 3 0 1 2 3 4 5 6 7
mls qos queue-set output 1 threshold 1 138 138 92 138
mls qos queue-set output 1 threshold 2 138 138 92 400
mls qos queue-set output 1 threshold 3 36 77 100 318
mls qos queue-set output 1 threshold 4 20 50 67 400
mls qos queue-set output 2 threshold 1 149 149 100 149
mls qos queue-set output 2 threshold 2 118 118 100 235
mls qos queue-set output 2 threshold 3 41 68 100 272
mls qos queue-set output 2 threshold 4 42 72 100 242
mls qos queue-set output 1 buffers 10 10 26 54
mls qos queue-set output 2 buffers 16 6 17 61
mls qos


!
class-map match-all AutoQoS-VoIP-RTP-Trust
 match ip dscp ef
class-map match-all AutoQoS-VoIP-Control-Trust
 match ip dscp cs3  af31
!
!
policy-map AutoQoS-Police-CiscoPhone
 class AutoQoS-VoIP-RTP-Trust
  set dscp ef
  police 320000 8000 exceed-action policed-dscp-transmit
 class AutoQoS-VoIP-Control-Trust
  set dscp cs3
  police 32000 8000 exceed-action policed-dscp-transmit
!


interface GigabitEthernet1/0/5
 switchport access vlan 10
 switchport voice vlan 20
 srr-queue bandwidth share 10 10 60 20
 queue-set 2
 priority-queue out
 mls qos trust device cisco-phone
 mls qos trust cos
 auto qos voip cisco-phone
 spanning-tree portfast
 service-policy input AutoQoS-Police-CiscoPhone
!


interface GigabitEthernet1/0/6
 switchport access vlan 10
 switchport voice vlan 20
 srr-queue bandwidth share 10 10 60 20
 queue-set 2
 priority-queue out
 mls qos trust device cisco-phone
 mls qos trust cos
 auto qos voip cisco-phone
 spanning-tree portfast
 service-policy input AutoQoS-Police-CiscoPhone
!

i made a call from phones on port 5 to 6. call goes through fine, here is what i get:

PSC-Switch#sh policy-map int gi1/0/5
 GigabitEthernet1/0/5

  Service-policy input: AutoQoS-Police-CiscoPhone

    Class-map: AutoQoS-VoIP-RTP-Trust (match-all)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: ip dscp ef (46)

    Class-map: AutoQoS-VoIP-Control-Trust (match-all)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: ip dscp cs3 (24) af31 (26)

    Class-map: class-default (match-any)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: any
        0 packets, 0 bytes
        5 minute rate 0 bps
PSC-Switch#

this really bothers me:

PSC-Switch#sh int gi1/0/5 stat
GigabitEthernet1/0/5
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0       1277      94132
             Route cache          0          0          0          0
                   Total          0          0       1277      94132
PSC-Switch#

i dont understand how there are no packets or characters incomming to that switch port...

oddly enough this command looks right and does increment:

GigabitEthernet1/0/5 (All statistics are in packets)

  dscp: incoming
-------------------------------

  0 -  4 :          15            0            0            0            0
  5 -  9 :           0            0            0            0            0
 10 - 14 :           0            0            0            0            0
 15 - 19 :           0            0            0            0            0
 20 - 24 :           0            0            0            0          100
 25 - 29 :           0            0            0            0            0
 30 - 34 :           0            0            0            0            0
 35 - 39 :           0            0            0            0            0
 40 - 44 :           0            0            0            0            0
 45 - 49 :           0          255            0            0            0
 50 - 54 :           0            0            0            0            0
 55 - 59 :           0            0            0            0            0
 60 - 64 :           0            0            0            0
  dscp: outgoing
-------------------------------

  0 -  4 :         209            0            0            0            0
  5 -  9 :           0            0            0            0            0
 10 - 14 :           0            0            0            0            0
 15 - 19 :           0            0            0            0            0
 20 - 24 :           0            0            0            0           83
 25 - 29 :           0            0            0            0            0
 30 - 34 :           0            0            0            0            0
 35 - 39 :           0            0            0            0            0
 40 - 44 :           0            0            0            0            0
 45 - 49 :           0          254            0            0            0
 50 - 54 :           0            0            0            0            0
 55 - 59 :           0            0            0            0            0
 60 - 64 :           0            0            0            0
  cos: incoming
-------------------------------

PSC-Switch#sh mls qos int gi1/0/5 stat
GigabitEthernet1/0/5 (All statistics are in packets)

  dscp: incoming
-------------------------------

  0 -  4 :          15            0            0            0            0
  5 -  9 :           0            0            0            0            0
 10 - 14 :           0            0            0            0            0
 15 - 19 :           0            0            0            0            0
 20 - 24 :           0            0            0            0          117
 25 - 29 :           0            0            0            0            0
 30 - 34 :           0            0            0            0            0
 35 - 39 :           0            0            0            0            0
 40 - 44 :           0            0            0            0            0
 45 - 49 :           0          356            0            0            0
 50 - 54 :           0            0            0            0            0
 55 - 59 :           0            0            0            0            0
 60 - 64 :           0            0            0            0
  dscp: outgoing
-------------------------------

  0 -  4 :         263            0            0            0            0
  5 -  9 :           0            0            0            0            0
 10 - 14 :           0            0            0            0            0
 15 - 19 :           0            0            0            0            0
 20 - 24 :           0            0            0            0           83
 25 - 29 :           0            0            0            0            0
 30 - 34 :           0            0            0            0            0
 35 - 39 :           0            0            0            0            0
 40 - 44 :           0            0            0            0            0
 45 - 49 :           0          356            0            0            0
 50 - 54 :           0            0            0            0            0
 55 - 59 :           0            0            0            0            0
 60 - 64 :           0            0            0            0
  cos: incoming
-------------------------------

  0 -  4 :          67            0            0          117            0
  5 -  7 :         356            0            0
  cos: outgoing
-------------------------------

  0 -  4 :         387            0            0            0            0
  5 -  7 :         356            0         1482
  output queues enqueued:
queue: threshold1 threshold2 threshold3
-----------------------------------------
 queue 0:           2           0         356
 queue 1:          32          43        1482
 queue 2:           0           0           0
 queue 3:           0           0         339

  output queues dropped:
queue: threshold1 threshold2 threshold3
-----------------------------------------
 queue 0:            0            0            0
 queue 1:            0            0            0
 queue 2:            0            0            0
 queue 3:            0            0            0

Policer: Inprofile:          429 OutofProfile:            0


i may not have a real issue here, it may be a simple case of poor consistancy between the ios sh outputs, hoping somone has run into this before.




 

by: kenboonejrPosted on 2009-07-02 at 19:07:15ID: 24769339

I did this same type setup last week on some 3750g switches.  I had esi IP phones.  I ran the auto qos and then had to remove the trust statements as that relies on cdp.  My stats were showing correct.  I did the same thing you did to check it because I wasn't sure if the phones were setting the qos the same way Cisco phones do.   I was using the latest IOS version in an ipbase feature set.  This was just last week.

 

by: Baran711Posted on 2009-07-03 at 07:18:29ID: 24772505

I have cisco phones 7975g. are you saying your policy map stats where correct when you did a sh policy-map int? mine def are not. any ideas?

 

by: kenboonejrPosted on 2009-07-03 at 07:34:25ID: 24772616

Yes the show policy-map int command showed the packets in the correct class maps with qos.  

 

by: kenboonejrPosted on 2009-07-03 at 07:34:38ID: 24772620

Call TAC

 

by: Baran711Posted on 2009-07-05 at 12:35:13ID: 24781060

tac pointed me to this:

http://supportwiki.cisco.com/ViewWiki/index.php/Unable_to_display_QoS_information_at_the_port_level_with_the_show_policy-map_interface_command_in_Catalyst_3750_switch

still doesnt explain why my sh mls qos int are not showing all of the dscp values increasing though.

 

by: kenboonejrPosted on 2009-07-05 at 17:55:17ID: 24781867

Well what does TAC say about the sho mls qos command not showing the stats incrementing?

 

by: Baran711Posted on 2009-07-05 at 19:12:17ID: 24782147

still waiting to get a response n that

 

by: Baran711Posted on 2009-07-16 at 06:27:59ID: 24868759

please close this, it is a known problem that will be fixed in the next ios release

 

by: kenboonejrPosted on 2009-10-30 at 08:47:51ID: 25704123

My second response indicated that it could be an IOS issue plus I assisted with verifying the configuration which was requested in the ticket.  I spent a lot of time going over this problem to assist.  I also made the suggestion to call TAC once everything was verified. I think points should be awarded.  

20120131-EE-VQP-002

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