ExtremeSwitching (EXOS)

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Simple VoIP configuration

  • 1.  Simple VoIP configuration

    Posted 05-09-2018 14:50
    I have a client with only 1 vlans - the default vlan and a VoIP called ENAVoice. All the tagging is done at the phone handset.

    create qosprofile "QP5"
    configure vlan "ENAVoice" qosprofile QP5
    configure dot1p type 5 qosprofile QP5
    configure dot1p type 6 qosprofile QP5
    configure diffserv examination code-point 46 qosprofile QP5

    Is there any more that needs to be done to give VoIP priority?

    fyi - the creation of ENAVoice tagged 200 and then enabeling of ELRP are the only things this customer has beyond a default configuration.


  • 2.  RE: Simple VoIP configuration

    Posted 05-09-2018 15:23
    Joshua,

    My understanding is that you can't use both Dot1P and DiffServ together. In our standard build, we issue a "disable dot1p examination ports all" following the config diffserv line. Here's what our template looks like:

    create qosprofile qp5

    config diffserv examination code-point 34 qp5

    config diffserv examination code-point 46 qp5

    enable diffserv examination ports all

    disable dot1p examination ports all # if you don't disable dot1p, diffserv won't work

    Eric


  • 3.  RE: Simple VoIP configuration

    Posted 05-09-2018 15:44
    Thanks. I will try that.


  • 4.  RE: Simple VoIP configuration

    Posted 05-10-2018 05:12
    Hi Joshua,

    Please check the following article

    https://gtacknowledge.extremenetworks.com/articles/How_To/Configuring-QOS-profiles-and-verify-QOS-is...

    These two points may be of relevance -
    • If traffic is expected to ingress with a DSCP or dot1p value, examination will need to be enabled on the port
    • If the traffic is not expected to ingress with a DSCP or dot1p value already set, ensure examination is disabled and the value is set via VLAN or port


  • 5.  RE: Simple VoIP configuration

    Posted 05-10-2018 07:12
    If the traffic is already being tagged by the phone and phone is tagged in the VLAN, then the following line is redundant and all you need to do is configure and enable examination:
    # configure vlan "ENAVoice" qosprofile QP5[/code]Dot1p values are carried in the 802.1Q header, so the phone port MUST be tagged in the ENAVoice VLAN, if not, then those Dot1p values will be stripped and the above command can be used to re-apply the value to the traffic
    DSCP values are carried in the IP Header, so port tagging is inconsequential.

    A stream can have both a Dot1p and DSCP value set. On inspection, the Dot1p value will always take precedence.

    You can verify your configuration by looking at the following output, if the QP counters are increasing in the correct queue then all is well:

    # show ports qosmonitor
    Port Qos Monitor
    Port QP1 QP2 QP3 QP4 QP5 QP6 QP7 QP8
    Pkt Pkt Pkt Pkt Pkt Pkt Pkt Pkt
    Xmts Xmts Xmts Xmts Xmts Xmts Xmts Xmts
    ================================================================================
    1 0 0 0 0 0 0 0 0
    2 0 0 0 0 0 0 0 0
    3 200 0 0 0 0 0 0 0
    4 0 0 2398 0 0 0 0 0
    5 0 180 0 0 0 0 0 0
    6 0 0 0 0 0 0 0 0
    7 0 0 0 1533 0 0 0 0
    8 0 0 0 0 0 0 0 0
    9 0 0 0 0 0 0 0 4
    10 0 0 0 0 0 0 0 51504[/code]Kind regards