QOS priority percent drops before the reserved bandwidth is saturated

rickycov23rickycov23 Registered Users Posts: 3 ■□□□□□□□□□
in CCNP
Hi
i have a issue about qos, in the configuration i have reserved 25% (2000 kb) to voice data, but testing i added an ip with source and destination to a acl, wich is asigned to the voice class just to verify, now, i have this problem

if i download a file from this location to another, begins to drop packets, can you help me please, or help me understand why this behavior


Class-map: RealTimeVoice (match-any)
8112 packets, 10223020 bytes
30 second offered rate 1146000 bps, drop rate 0 bps
Match: ip dscp ef (46)
725 packets, 46583 bytes
30 second rate 5000 bps
Match: ip dscp cs5 (40)
0 packets, 0 bytes
30 second rate 0 bps
Match: ip precedence 5
0 packets, 0 bytes
30 second rate 0 bps
Match: access-group name ETIQUETADO
7387 packets, 10176437 bytes
30 second rate 1141000 bps
Priority: 25% (2000 kbps), burst bytes 50000, b/w exceed drops: 59

Best Regards
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Comments

  • networker050184networker050184 Mod Posts: 11,962 Mod
    What does your policy-map config look like?
    An expert is a man who has made all the mistakes which can be made.
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  • rickycov23rickycov23 Registered Users Posts: 3 ■□□□□□□□□□
    this is the config

    class-map match-any RealTimeVoice
    match ip dscp ef
    match ip dscp cs5
    match ip precedence 5
    match access-group name ETIQUETADO
    !
    !
    policy-map 50-50
    class DataPlus
    bandwidth percent 50
    set ip dscp cs3
    class DataNormal
    bandwidth percent 49
    set ip dscp cs2
    policy-map 25-50
    class RealTimeVoice
    priority percent 25
    set ip dscp ef
    class DataP+N
    bandwidth percent 50
    service-policy 50-50
    class class-default
    fair-queue


    policy-map shape-GYR-25-50-25_8Mbps
    class class-default
    shape average 8000000
    service-policy 25-50


    interface GigabitEthernet0/0
    service-policy output shape-GYR-25-50-25_8Mbps



    ip access-list extended ETIQUETADO
    permit ip host 172.24.101.91 host 172.16.32.22
    permit ip host 172.16.32.22 host 172.24.101.91
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  • networker050184networker050184 Mod Posts: 11,962 Mod
    Are the drops counting up? Is your packet rate high enough that you are causing bursts that over flow the queue? As it sits your average isn't breaking the 25% so it wouldn't matter if there is traffic in the other classes or not.
    An expert is a man who has made all the mistakes which can be made.
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  • rickycov23rickycov23 Registered Users Posts: 3 ■□□□□□□□□□
    has only discards when I download a file, I have one doubt, as I check what my packet rate? I do not have much experience with qos


    thank you very much for the support
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  • networker050184networker050184 Mod Posts: 11,962 Mod
    To get anything beyond your basic thirty second average you'll need some hardware specific commands to look at queues.
    An expert is a man who has made all the mistakes which can be made.
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