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Forum Replies

  1. Rene,

    Is there any course material that explains QOS WRR? I’m trying to figure why I dont see any global configuration lines on my 6509, however, when I run Show queueing interface gi 9/1 (for example), I see WRR wred settings, also, I see Output Discards on Queue 0 discarding cos 0 & 1 data. MLS Qos is enabled.

    Any thoughts?

    Thanks!

    Joey

  2. Hi Joey,

    Configuration-wise, WRR (Weighted Round Robin) and SRR (Shaped Round Robin) are very similar. You can use the examples in this lesson:

    http://tomcategorysearch.deparagon.com/?page=quality-of-service/how-to-configure-queuing-on-cisco-catalyst-3560-and-3750-switch/

    Something to keep in mind is that a lot of commands will only show up in your configuration if you use non-default values. Here’s an example:

    Switch#show running-config | incl mls
    mls qos
    

    QoS has been enabled on this switch, that’s the only command we have in our config. Let’s check the default cos-dscp map:

    ... Continue reading in our forum

  3. Hello Sze Jie K

    I’ll attempt to answer your questions below:

    Yes. When a port is set to untrusted (by default) it does not trust the CoS values of the incoming frames, so those are reset to the value set in the command.

    ... Continue reading in our forum

  4. Hi Sze Jie K,

    Let me jump in on this. You are using a 3560 or 3750?

    Once you enable QoS, all CoS/DSCP values get assigned to 4 different queues. You can’t change or disable these. If you want to mimic something where only voice traffic gets priorited then you could configure something like this:

    Q1: 10% of bandwidth
    Q2: 80% of bandwidth
    Q3/Q4: each 5% of bandwidth

    You can assign the CoS/DSCP values that you use for Voice to Q1 and everything else to Q2. It’s a pain to configure QoS on these switches as it affects all your traffic. It’s not as easy as on a route

    ... Continue reading in our forum

  5. These switches only have one priority queue, the other queues are served in (weighted) round robin so Q2 doesn’t have a higher priority than Q3.

    ... Continue reading in our forum

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