Why is there a delay with no shut command on a serial interface?

JockVSJockJockVSJock Posts: 1,118Member
So yesterday I was troubleshooting an issue with a distant end and had to change the interface (from shut to no shut) and protocol (ppp to hdlc) on a serial interface on a Tier 2 Cisco Router.

I was under the gun and for some reason it seems like I waited a few minutes when waiting to see that glorious up/up on that Serial Interface.

Chris Bryant talked about this on his Train Signal DVD. If you change the open/close the interface and/or change the protocol, stick around a few minutes to confirm that it is correct. However he didn't go into the why. I Googled around and couldn't find an answer and was wondering if anyone knew why there is some time delay with this.

thanks
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Comments

  • ciscoman2012ciscoman2012 Posts: 313Member
    Hmm I would like to know the answer too.

    The only thing I know is that Chris Bryant is the sh!t
  • ChickenNuggetzChickenNuggetz Posts: 284Member
    JockVSJock wrote: »
    So yesterday I was troubleshooting an issue with a distant end and had to change the interface (from shut to no shut) and protocol (ppp to hdlc) on a serial interface on a Tier 2 Cisco Router.

    I was under the gun and for some reason it seems like I waited a few minutes when waiting to see that glorious up/up on that Serial Interface.

    Chris Bryant talked about this on his Train Signal DVD. If you change the open/close the interface and/or change the protocol, stick around a few minutes to confirm that it is correct. However he didn't go into the why. I Googled around and couldn't find an answer and was wondering if anyone knew why there is some time delay with this.

    thanks

    I'm assuming this was a lab set-up that you're playing around with. If it is, the delay could be on account of the DTE/DCE clock rates synchronizing.
    :study: Currently Reading: Red Hat Certified Systems Administrator and Engineer by Ashgar Ghori

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  • JockVSJockJockVSJock Posts: 1,118Member
    I'm assuming this was a lab set-up that you're playing around with.

    This is actual production equipment.
    ***Freedom of Speech, Just Watch What You Say*** Example, Beware of CompTIA Certs (Deleted From Google Cached)

    "Its easier to deceive the masses then to convince the masses that they have been deceived."
    -unknown
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