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5510 Views 4 Replies Latest reply: Mar 10, 2009 6:16 PM by ryan73 RSS

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Default DTP mode

Mar 8, 2009 8:22 PM

ryan73 12 posts since
Mar 8, 2009


I have a question regarding the default DTP mode a port is in and a couple conflicting sources of info.



The Cisco Press CCIE R&S 3rd ed states on page 45, "Cisco switches default to use DTP desirable mode"



Yet the 3560 software config guide states on page 12-19 the the default layer 2 interface vlan config is, "switchport mode dynamic auto"



Could they be talking about different models in the CCIE R&S guide other than the 3560s?



Thanks in advance.



  • Chetan 539 posts since
    Jul 26, 2008
    Currently Being Moderated
    1. Mar 9, 2009 6:15 AM (in response to ryan73)
    Re: Default DTP mode

    Hi Ryan,


    I am also confused..


    CCIE R&S Guide (3rd Edition ) says that ,"Cisco Switches default to use DTP desirable mode". However no specific model is mentioned here.


    3560 software configuration guide says that, default mode is "dynamic auto"


    CCNP BCMSN Official Exam Certification Guide 642-812, 4th Edition (Page-125) says that the default mode is, "dynamic desirable"


    ICND2 Official Exam Certification Guide 2nd Edition 2007 (Page-30 ), says that "2960 switches default to an administrative mode of dynamic auto".


    For 3550 model, the link


    says that,


    "The default switch-port mode for all Ethernet interfaces is dynamic desirable."



    So...what now ??

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  • Scott Morris - CCDE/4xCCIE/2xJNCIE 8,426 posts since
    Oct 7, 2008
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    2. Mar 9, 2009 9:39 AM (in response to Chetan)
    Re: Default DTP mode


    The "older" switches wanted to form trunks, hence the dynamic desirable was the default.



    Newer switches are a tad more conservative, so the dynamic auto is now the default.



    Where does the exam fall into this changeout? Unfortunately, I haven't got a clue. I would likely go with the newer "dynamic auto" answer unless proven otherwise. It may also be worthwhile to open a case with CertSupport folks about that. While they will likely not tell you what the answer is (would take the fun away!), they would pass the information along to exam content folks and they could be sure of updates/corrections as needed.



    Cert Support folks are not necessarily technically savvy. So be professional, and give quotes/links to the docs and courseware.



    My two cents.









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  • Mohamed Sobair 344 posts since
    Oct 21, 2008
    Currently Being Moderated
    3. Mar 9, 2009 9:43 AM (in response to ryan73)
    Re: Default DTP mode





    It depends on the Switch series, for Instance , the 3550 Switch ports defaults to dynamic-desirable , while on the 3560 Switch ports its default to Dynamic-auto.









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