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Forum Replies

  1. Hi Rene, i like your blog and web gns3vault
    I’ve a question because i’m doing troubleshooting with qos in switches and when i look at the policy i don’t see what i expect to see.

    i have applied a policy fa0/1 input. i inject traffic but i don’t see ever increasing packet. Could it be because it is a switch ? when is a router i see increases

    C3560-24TS_1#sh policy-map interface

    FastEthernet0/1

    Service-policy input: QoS_In

    Class-map: Clase_Gestion (match-all)
    
      0 packets, 0 bytes
    
       offered rate 0 bps, drop rate 0 bps
    
      Match: ip precedence 7 
    
    Class-map: Cla
    ... Continue reading in our forum

  2. Hi Rene,

    I have a question and may not be related to this section but it is to switches. I have been having latency issues with all my users in one location. We install a new 3560x switch with Access to shares, printing and voip and they are very very slow. I called cisco in regards to checking QOS on my switch, spoke to 2 different Engineers and I got different opinions, I have mls qos statements but QOS never enable so one opinion recommended these settings on the interface:

    srr-queue bandwidth share 10 10 60 20
    priority-queue out
    mls qos trust cos
    auto qos 
    ... Continue reading in our forum

  3. Hi Alfredo,

    QoS on switches can be a pain…first of all, if you don’t have “mls qos” enabled then it won’t do any packet rewriting but it will still be queuing.

    Take a look at this post, there I explain how queuing works and there’s a great video that explains QoS on the switches:

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

    Here’s an example of a production 3560 switch here without “mls qos” enabled, you can see it’s queuing:

    SWITCH#show mls qos interfac GigabitEthernet 0/1 statistics
    GigabitEth
    ... Continue reading in our forum

  4. Hello Azm!

    Always happy to answer questions!

    It is true that COS functions at layer 2 and DSCP functions at layer 3. However, switches can be configured to use the COS or the DSCP for the reference to QoS. It really depends on what you want and how you have configured the switch. The trust parameters will essent

    ... Continue reading in our forum

  5. Hello Azm

    Yes, you are correct.

    ... Continue reading in our forum

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