[c-nsp] QOS for VOIP 1811

[Paul Stewart]

Can anyone tell me what's wrong with this configuration or a better way to
do it?  It doesn't appear to be working.

 

1811 - Cisco IOS Software, C181X Software (C181X-ADVENTERPRISEK9-M), Version
12.4(20)T, RELEASE SOFTWARE (fc3)

 

3500Kb/s bi-directional connection via PPPOE - trying to give VOIP priority.
matching against destination IP address of a Session Border Controller..

 

class-map match-all Call-Signalling

 match access-group 155

class-map match-all Voice

 match access-group 155

!

!

policy-map VOIP

 class Voice

    priority 100

 class Call-Signalling

    bandwidth 10

 class class-default

    fair-queue

     random-detect

 

interface FastEthernet0

bandwidth 3500

 no ip address

 ip mtu 1492

 ip nat outside

 ip virtual-reassembly

 ip tcp adjust-mss 1452

 duplex auto

 speed auto

 pppoe enable group global

 pppoe-client dial-pool-number 1

 service-policy output VOIP

 

interface Dialer0

 bandwidth 3500

 ip address negotiated

 ip nat outside

 ip virtual-reassembly

 encapsulation ppp

 ip tcp adjust-mss 1452

 load-interval 30

 dialer pool 1

 dialer-group 1

 no cdp enable

 ppp authentication pap callin

 ppp pap sent-username xxxxxxxxxxxxxx

 service-policy output VOIP

 

 

As you can see, I'm trying to match in two places to cover all bases.. Also
cannot find a way to do an inbound service policy.. Of which is most likely
my problem.  If I hit peak traffic my voice quality gets bad..

 

Can someone suggest a better way? ;)  I've tried applying the QOS policy on
Vlan1 (hoping I would get traffic in and out of the router that way) and get
this:

 

demarc-psa(config-if)#service-policy output VOIP

Configuration failed!

 

It's marking the packets correctly but not keeping the voice quality intact:

 

demarc-psa#sh policy-map  interface FastEthernet 0

 FastEthernet0

 

  Service-policy output: VOIP

 

    queue stats for all priority classes:

      Queueing

      queue limit 64 packets

      (queue depth/total drops/no-buffer drops) 0/0/0

      (pkts output/bytes output) 724224/228059272

 

    Class-map: Voice (match-all)

      732132 packets, 230445897 bytes

      5 minute offered rate 80000 bps, drop rate 0 bps

      Match: access-group 155

      Priority: 100 kbps, burst bytes 2500, b/w exceed drops: 0

 

 

    Class-map: Call-Signalling (match-all)

      56 packets, 42988 bytes

      5 minute offered rate 0 bps, drop rate 0 bps

      Match: access-group 155

      Queueing

      queue limit 64 packets

      (queue depth/total drops/no-buffer drops) 0/0/0

      (pkts output/bytes output) 56/42988

      bandwidth 10 kbps

 

    Class-map: class-default (match-any)

      3392831 packets, 378440929 bytes

      5 minute 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) 3392833/378442341

      Fair-queue: per-flow queue limit 16

        Exp-weight-constant: 9 (1/512)

        Mean queue depth: 0 packets

        class     Transmitted       Random drop      Tail/Flow drop Minimum
Maximum Mark

                  pkts/bytes    pkts/bytes       pkts/bytes    thresh
thresh  prob

 

        0         3389220/378170759       0/0              0/0
20            40  1/10

        1               0/0               0/0              0/0
22            40  1/10

        2               0/0               0/0              0/0
24            40  1/10

        3               0/0               0/0              0/0
26            40  1/10

        4               0/0               0/0              0/0
28            40  1/10

        5               0/0               0/0              0/0
30            40  1/10

        6            3613/271582          0/0              0/0
32            40  1/10

        7               0/0               0/0              0/0
34            40  1/10

 

 

Thanks in advance,

 

Paul