I thought so. This

stamati76 · ‎09-10-2015

Hi, one of our customers has complained of intermittent issues with voice calls. We provide the customer with WAN circuits and devices.

I have logged onto the routers on both ends ASA1001 on our side and an 887VA on theirs. I cannot see any packet drops from qos policy map on the customer side

But there are voice drops on ours. I am concerned in regards to the burst bytes of the voice class policy.

Please see below and tell me your thoughts

GigabitEthernet0/1/2.1550

Service-policy input: POLICY-SET-IP-DSCP-DEFAULT

    Class-map: class-default (match-any)
      2545477743 packets, 681354727064 bytes
      5 minute offered rate 745000 bps, drop rate 0000 bps
      Match: any
      QoS Set
        dscp default
          Marker statistics: Disabled

Service-policy output: POLICY-QOS-OUT-10MB-4MB

    Class-map: class-default (match-any)
      2578911148 packets, 821205598243 bytes
      5 minute offered rate 1478000 bps, drop rate 0000 bps
      Match: any
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/2179649/0
      (pkts output/bytes output) 2576731344/818472486984
      shape (average) cir 10240000, bc 40960, be 40960
      target shape rate 10240000

Service-policy : POLICY-QOS-CHILD-POLICY-10MB-4MB

        queue stats for all priority classes:
          Queueing
          queue limit 512 packets
          (queue depth/total drops/no-buffer drops) 0/1876/0
          (pkts output/bytes output) 184896/135482151

        Class-map: VOICE-CLASS (match-any)
          186772 packets, 138320981 bytes
          5 minute offered rate 0000 bps, drop rate 0000 bps
          Match: access-group name VOICE-PROTOCOL-TRAFFIC
          Priority: 4096 kbps, burst bytes 102400, b/w exceed drops: 1876

        Class-map: PREMIUM-DATA-CLASS (match-any)
          67197 packets, 77885178 bytes
          5 minute offered rate 0000 bps, drop rate 0000 bps
          Match: access-group name PREMIUM-DATA-TRAFFIC
          Match: access-group name MANAGEMENT
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/94/0
          (pkts output/bytes output) 67103/77744868
          bandwidth 1024 kbps

        Class-map: STANDARD-DATA-CLASS (match-any)
          2578657024 packets, 820989352094 bytes
          5 minute offered rate 1479000 bps, drop rate 0000 bps
          Match: any
          QoS Set
            dscp default
              Marker statistics: Disabled

        Class-map: class-default (match-any)
          0 packets, 0 bytes
          5 minute offered rate 0000 bps, drop rate 0000 bps
          Match: any

Richard Bradfield · ‎09-11-2015

Hi,

I take it the B/w on customers side is 4Mbps, and your side is 10Mbps. is this the only customer on this link? if so why are you shaping to 10Mbps, if you only have the one customer who is running 4 Mbps you should shape your end to 4Mbps

Service-policy output: POLICY-QOS-OUT-10MB-4MB

    Class-map: class-default (match-any)
      2578911148 packets, 821205598243 bytes
      5 minute offered rate 1478000 bps, drop rate 0000 bps
      Match: any
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 0/2179649/0
      (pkts output/bytes output) 2576731344/818472486984
      shape (average) cir 10240000, bc 40960, be 40960
      target shape rate 10240000

If you are going to more than one site then you have to do QOS shaping to the bandwidth of each site.

HTH

Richard.

stamati76 · ‎09-12-2015

Thanks for your reply. The 10Mb is their total bw of which 4Mb is reserved for voice.

Richard Bradfield · ‎09-12-2015

OK, got it.

Please below an example from one of my 4Mbps sites and I have highlighted differences

GigabitEthernet0/2

Service-policy output: 4Mbps

Class-map: class-default (match-any)
2715866937 packets, 1200863695918 bytes
5 minute offered rate 926000 bps, drop rate 0000 bps
Match: any
Queueing
queue limit 1000 packets > queue limit higher than yours
(queue depth/total drops/no-buffer drops) 0/1151418/0
(pkts output/bytes output) 2714715517/1199903452966
shape (average) cir 4000000, bc 40000, be 0 > note differences here.
target shape rate 4000000

Service-policy : QOS_QUEUE

queue stats for all priority classes:
Queueing
queue limit 64 packets > again queue limit
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts output/bytes output) 133434693/17478459522

Class-map: QUEUE-VOICE (match-any)
111982012 packets, 8328680682 bytes
5 minute offered rate 0000 bps, drop rate 0000 bps
Match: dscp ef (46)
111982012 packets, 8328680682 bytes
5 minute rate 0 bps
Priority: 640 kbps, burst bytes 16000, b/w exceed drops: 0
-

AS you can see I get no voice drops.

HTH

Richard.

stamati76 · ‎09-12-2015

Hi,Richard. Thanks for all your help. Which end is this configuration from, provider or customer?

Richard Bradfield · ‎09-12-2015

this is actually one of my remote sites, the head end is more complicated as we have a number of sites hanging off the one interface so there is a per site policy nested in the QOS, but again I do not have any voice drops

stamati76 · ‎09-13-2015

I thought so. This configuration is a subinterface on our, the provider's WAN, link.

The customer side is not seeing any drops on their interface. Any ideas?

Richard Bradfield · ‎09-13-2015

ok, that puts a different light on it.

If it is just a subinterface on your WAN link , could traffic on the other subinterfaces effect the bandwidth available?

Poor Voice quality