QOS for VOIP using 768k of FR / Auto QOS

Discussion in 'Cisco' started by Andrew Albert, Feb 6, 2005.

  1. I would like to configure auto qos on a cisco 2621 but run into the
    following message when I execute auto qos voip on s0/0.1

    nyc_router(config-subif)#frame-relay interface-dlci 886 IETF
    nyc_router(config-fr-dlci)#auto qos voip
    %Point-to-point sub-interface is not set for CISCO encapsulation !
    AUTOQOS ERROR: Failed to configure "frame-relay ip rtp
    header-compression "
    %Point-to-point sub-interface is not set for CISCO encapsulation !

    I would like to make the changes to allow for auto qos, but doing so
    remotely I worry about losing connectivity from a wrong execution

    Any suggestions on a course of action would be appreciated.

    Thank you,

    interface Serial0/0
    description to PROVIDER
    bandwidth 768
    no ip address
    no ip redirects
    no ip proxy-arp
    encapsulation frame-relay IETF
    no ip mroute-cache
    priority-group 1
    service-module t1 timeslots 12-23
    frame-relay lmi-type ansi
    interface Serial0/0.1 point-to-point
    bandwidth 768
    ip address
    ip nat outside
    frame-relay interface-dlci 886 IETF
    Andrew Albert, Feb 6, 2005
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  2. Andrew Albert

    BradReeseCom Guest

    BradReeseCom, Feb 6, 2005
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  3. Andrew Albert

    Ben Guest

    Hi Andrew,

    Ideally you would already have some sort of out-of-band access to the
    remote router, such as via a modem on the aux port. Or just a fellow
    tech at the other end to do the config change simultaneously.

    Worst case, you could risk changing the remote end first, which will
    drop your telnet session, then change the local end and hope it comes up.


    Ben, Feb 7, 2005
  4. Guess I will have to do things when somebody is onsite.... The key
    question though, is why I was unable to get auto qos to take on the
    interface (is it absolutely required that the remote provider have
    this enabled?)......


    Andrew Albert, Feb 7, 2005
  5. Andrew Albert

    Toby Guest

    Cisco type LMI would be required as it can learn the CIR/PIR values set in
    the Frame-Relay cloud on the PVC's, ANSI does not include this information.


    Toby, Feb 7, 2005
  6. What if you are forced to use IETF from your upstream provider? Any
    suggestions on which way to proceed?


    Andrew Albert, Feb 8, 2005
  7. Andrew Albert

    Toby Guest

    Hi Andy

    I am not sure exactly how AutoQos works apart from it detecting type of
    flows using NBAR (protocol recognition) and providng some sort of priority
    algorithm to what it deems possible voice traffic along with MGCP, Skinny,
    and H.323 signaling traffic.

    Without this feature you are going to need to have a box/IOS able to
    adequately classify/mark and police the traffic yourself. I am not a network
    designer though so don't know which IOS varient would be suitable for which

    The method I am used to using is LLQ (Low Latecy Queuing), this is a multi
    queue system with one queue given strict priority over other traffic which
    your voice traffic would go in. As well as having an IOS that supports this
    you will need to plan your bandwidth requirements over your link(s)
    effectively. This method is far too complex to explain in a news group from
    the ground up though, so if you intend using this method I suggest the Cisco
    press book QDOS. In the end though this method will give more control and
    with good planning a much supperior QOS method than any autoqos feature.


    Toby, Feb 9, 2005
  8. Andrew Albert

    Toby Guest

    Correction to below. Cisco book is called DQOS not QDOS. It is a very good
    book but may seem a bit over the top for a single link (if that's all you
    are concerned with). It is very conceptual based to begin with and only
    becomes usefull past half way through in a practical sense.


    Toby, Feb 9, 2005
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