Trunking Modes

controlcontrol Member Posts: 309
in CCNA & CCENT
What is the deal with the Nonegotiate mode?
I know it is ready to trunk, but is this not just the same as "on" and "desireable"? All are ready to trunk?
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Comments

  • fsanyeefsanyee Member Posts: 171
    DTP is cisco proprietary protocol, it works with cisco devices. nonegotiate can be good when you connect other vendors devices to your switch.
    or it can prevent your switch from trunking with rough devices.
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  • NB4LNB4L Member Posts: 15 ■□□□□□□□□□
    I was wondering the same thing. Thanks.
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  • Forsaken_GAForsaken_GA Member Posts: 4,024
    It's also something of a security measure. If I hooked up something that could automatically negotiate a trunk, then chances are, I could get a host on whatever VLAN's I want. This is significant, since some Cisco platforms default to dynamic desirable on every port out of the box.

    This is why whenever I spin up a new switch, every single port is set to access mode, and any configured trunks are hardcoded.
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