Re: QoS prioritization doesn't work correctly and no QoS control fields

Thanks, Yi!

These are the qos settings from the running-config file of my Cisco 1130AG
AP (qos capable):
----------------------------------------------------------------------------------------------
traffic-class background cw-min 4 cw-max 10 fixed-slot 7
traffic-class best-effort cw-min 4 cw-max 10 fixed-slot 3
traffic-class video cw-min 3 cw-max 4 fixed-slot 2
traffic-class voice cw-min 2 cw-max 3 fixed-slot 2
dot11 qos class background
    transmit-op 0
!
dot11 qos class best-effort
    transmit-op 0
!
dot11 qos class video
    transmit-op 3008
!
dot11 qos class voice
    transmit-op 1504
!
----------------------------------------------------------------------
They settings should be fine, I think. But when I capture the beacons or
probe_resp I see the two sets of vendor specific QoS settings: 'Aironet Qos'
and 'WME' (see frame below). They are a bit different from each other and
they do not match the settings I have in the running_config file (which is
strange).
Questions:
1) does ipw2200 understand such vendor specific Qos info in beacons?
2) If yes, then which set would be used by ipw2200: 'Aironet Qos' or 'WME'?

Thanks a million as always!!!!

Frame 1 (228 bytes on wire, 228 bytes captured)
Radiotap Header v0, Length 25
IEEE 802.11
    Type/Subtype: Beacon frame (0x08)
    Frame Control: 0x0080 (Normal)
    Duration: 0
    Destination address: Broadcast (ff:ff:ff:ff:ff:ff)
    Source address: Cisco_4f:33:80 (00:15:2c:4f:33:80)
    BSS Id: Cisco_4f:33:80 (00:15:2c:4f:33:80)
    Fragment number: 0
    Sequence number: 1699
IEEE 802.11 wireless LAN management frame
    Fixed parameters (12 bytes)
    Tagged parameters (167 bytes)
        SSID parameter set: "ntapc1a"
        Supported Rates: 6.0 9.0 12.0(B) 18.0 24.0 36.0 48.0 54.0
        Traffic Indication Map (TIM): DTIM 1 of 2 bitmap empty
        Country Information: Country Code: DE, Any Environment
        QBSS Load Element
        Power Constraint: Tag 32 Len 1
        Cisco Unknown 1 + Device Name
        Symbol Proprietary: Tag 173 Len 15
        Vendor Specific: Aironet Unknown
        Vendor Specific: Aironet CCX version = 3
        Vendor Specific: Aironet Qos
            Tag Number: 221 (Vendor Specific)
            Tag length: 22
            Aironet IE type: Qos (4)
            Aironet IE QoS unknown 1: 0x00
            Aironet IE QoS paramset: 5
            CCX QoS Parameters??: ACI 0 (Best Effort), Admission Control not
Mandatory, AIFSN 7, ECWmin 4, ECWmax 10, TXOP 0
            CCX QoS Parameters??: ACI 1 (Background), Admission Control not
Mandatory, AIFSN 3, ECWmin 4, ECWmax 10, TXOP 0
            CCX QoS Parameters??: ACI 2 (Video), Admission Control not
Mandatory, AIFSN 2, ECWmin 3, ECWmax 4, TXOP 0
            CCX QoS Parameters??: ACI 3 (Voice), Admission Control not
Mandatory, AIFSN 2, ECWmin 2, ECWmax 3, TXOP 0
        Vendor Specific: WME
            Tag Number: 221 (Vendor Specific)
            Tag length: 24
            Tag interpretation: WME PE: type 2, subtype 1, version 1,
parameter set 5
            Tag interpretation: WME AC Parameters: ACI 0 (Best Effort),
Admission Control not Mandatory, AIFSN 3, ECWmin 4, ECWmax 4, TXOP 0
            Tag interpretation: WME AC Parameters: ACI 1 (Background),
Admission Control not Mandatory, AIFSN 7, ECWmin 4, ECWmax 4, TXOP 0
            Tag interpretation: WME AC Parameters: ACI 2 (Video), Admission
Control not Mandatory, AIFSN 2, ECWmin 3, ECWmax 3, TXOP 94
            Tag interpretation: WME AC Parameters: ACI 3 (Voice), Admission
Control not Mandatory, AIFSN 2, ECWmin 2, ECWmax 2, TXOP 47



2008/12/17 Zhu Yi <[email protected]>

> On Tue, 2008-12-16 at 17:52 +0800, Marco Talunzo wrote:
> > If ipw2200 debug output says that qos is enabled, but there are no QoS
> > control fields, it means only that the problem is with the access
> > point. Is this correct? (I enabled qos in my cisco AP, but I have some
> > reasons to believe that AP might not properly work).
>
> If the AP is not 11e/WMM capable, the driver won't use it. Make sure you
> see the qos info from beacon or proble_resp frames from AP.
>
> Thanks,
> -yi
>
>

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