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Bronze

QOS for voice

Hi.

Why do I see voice traffic on one router and not on another:

Class-map: VOICE (match-all)
          0 packets, 0 bytes
          30 second offered rate 0 bps, drop rate 0 bps
          Match:  dscp ef (46)
          Priority: 25% (9900 kbps), burst bytes 247500, b/w exceed drops: 0

Class-map: VOICE (match-all)
          8816096 packets, 1917880834 bytes
          5 minute offered rate 0 bps, drop rate 0 bps
          Match:  dscp ef (46)

It's the same service-policy on both routers.

regards

bjornarb

Everyone's tags (1)
8 REPLIES
New Member

Re: QOS for voice

Can you provide more details, configuration? Show commands as well

Sent from Cisco Technical Support iPhone App

Bronze

QOS for voice

Hi.

We assume that the voice traffic is marked at source.

Configuration:

!

class-map match-any BUSINESS

match access-group name MARK-BUSINESS

class-map match-all SHAPING

match any

class-map match-all VOICE

match  dscp ef

!

!

policy-map QOS

class VOICE

  priority percent 25

  set dscp ef

class BUSINESS

  bandwidth remaining percent 70

  set dscp af31

class class-default

  fair-queue

  set dscp default

policy-map QOS_VRF_BRUKER

class SHAPING

  shape average percent 100

  bandwidth percent 99

  service-policy QOS

!

!

interface GigabitEthernet0/1

service-policy output QOS_VRF_BRUKER

!

New Member

QOS for voice

bjornarb

few comments here:

- The policy-map on the second router it looks it is not configured correctly, I dont see the priority in there

- Why do re mark the packet in your policy if it is already marked? no need for the command "set dscp ef"

- clear the counters and change the load-interval to 30 seconds on both switches, run voice traffic or use ping command with extended option and set the TOS to 184, and provide the show policy-map from both routers. I see the rate in both routers is zero, lets verify there are marked packet with this dscp

Regards


Bronze

QOS for voice

Hi again.

We removed the re-marking. Pinged with tos 184, but still no counters:

Class-map: VOICE (match-all)

          0 packets, 0 bytes

          30 second offered rate 0 bps, drop rate 0 bps

          Match:  dscp ef (46)

          Priority: 25% (9900 kbps), burst bytes 247500, b/w exceed drops: 0

New Member

QOS for voice

Can you provide the complete output?

is the traffic matching the class-default?

Bronze

QOS for voice

#sh policy-map interface gigabitEthernet 0/1
GigabitEthernet0/1

  Service-policy output: QOS_VRF_BRUKER

    Class-map: SHAPING (match-all)
      396310 packets, 50532155 bytes
      30 second offered rate 751000 bps, drop rate 0 bps
      Match: any
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 396310/50538173
      shape (average) cir 40000000, bc 400000, be 400000
      target shape rate 40000000
      bandwidth 99% (39600 kbps)

      Service-policy : QOS

        queue stats for all priority classes:
         
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/0/0
          (pkts output/bytes output) 0/0

        Class-map: VOICE (match-all)
          0 packets, 0 bytes
          30 second offered rate 0 bps, drop rate 0 bps
          Match:  dscp ef (46)
          Priority: 25% (9900 kbps), burst bytes 247500, b/w exceed drops: 0
         

        Class-map: BUSINESS (match-any)
          396219 packets, 50522352 bytes
          30 second offered rate 751000 bps, drop rate 0 bps
          Match: access-group name MARK-BUSINESS
            396219 packets, 50522352 bytes
            30 second rate 751000 bps
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/0/0
          (pkts output/bytes output) 396219/50528370
          bandwidth remaining 70% (20790 kbps)
          QoS Set
            dscp af31
              Packets marked 396219

        Class-map: class-default (match-any)
          91 packets, 9803 bytes
          30 second offered rate 0 bps, drop rate 0 bps
          Match: any
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops/flowdrops) 0/0/0/0
          (pkts output/bytes output) 91/9803
          Fair-queue: per-flow queue limit 16
          QoS Set
            dscp default
              Packets marked 0

    Class-map: class-default (match-any)
      0 packets, 0 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      Match: any
     
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 0/0

Bronze

QOS for voice

Here is the output after 20 ping with TOS 184.

Service-policy : QOS

        Class-map: VOICE (match-all)
          20 packets, 2360 bytes
          5 minute offered rate 1000 bps, drop rate 0 bps
          Match:  dscp ef (46)
          Queueing
            Strict Priority
            Output Queue: Conversation 264
            Bandwidth 25 (%)
            Bandwidth 10000 (kbps) Burst 250000 (Bytes)
            (pkts matched/bytes matched) 0/0
            (total drops/bytes drops) 0/0

Bronze

QOS for voice

The problem was that if you have auto qos on trunk ports it will remove the marking if you do not have qos on access ports.

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