Announcement

Collapse
No announcement yet.

Configuring Interfaces

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Configuring Interfaces

    I'm currently working on Cisco Netlab, and Packet Tracer.

    I know how to enable interface's, but the problem is that the interface's are not actually enabling.

    I assign an IP address and subnet mask to an interface, and then use the "no shutdown" command to enable the interface.

    I then go back and use the "show ip interface" command to get the interface details, but the interface status NEVER changes from down, to up.

    Can anyone offer any advice?? I can maybe understand it happening with Netlab as the router's have been faulty in the last few days....but I just downloaded a fresh copy of Packet Tracer, and the fact that the interface's are not enabling in packet tracer show that I may be making a mistake somewhere.

    Any tips please guys?

  • #2
    Re: Configuring Interfaces

    Can you post the results of the show ip interface?

    Did you put a networkcable into the interface?
    Marcel
    Technical Consultant
    Netherlands
    http://www.phetios.com
    http://blog.nessus.nl

    MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
    "No matter how secure, there is always the human factor."

    "Enjoy life today, tomorrow may never come."
    "If you're going through hell, keep going. ~Winston Churchill"

    Comment


    • #3
      Re: Configuring Interfaces

      Which interface(s) are you referring to. AFAIK an interface needs to be connected in order to be in an "up" state.

      Comment


      • #4
        Re: Configuring Interfaces

        True joeqwerty, that's why i've asked if he put a networkcable in the interface.

        Difference between shutdown and no cable is:
        Administrative down : the port is shut.
        No cable or wrong cable: port is down.
        Marcel
        Technical Consultant
        Netherlands
        http://www.phetios.com
        http://blog.nessus.nl

        MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
        "No matter how secure, there is always the human factor."

        "Enjoy life today, tomorrow may never come."
        "If you're going through hell, keep going. ~Winston Churchill"

        Comment


        • #5
          Re: Configuring Interfaces

          Originally posted by Dumber View Post
          True joeqwerty, that's why i've asked if he put a networkcable in the interface.

          Difference between shutdown and no cable is:
          Administrative down : the port is shut.
          No cable or wrong cable: port is down.
          Well, all the router's are all already preset with the cables and such all plugged in. But someone suggested I try setting up IP addresses between each router so that the interface's have something to connect to. So i'm going to try that and see if it works.

          Hopefully, next time i use the no shutdown command the interface's should actually ACTIVATE this time. lol it just makes no sense as to why the interface's shouldn't activate when I tell them to.

          Comment


          • #6
            Re: Configuring Interfaces

            Again, which interfaces are you referrin to? If yiu are referring to Serial interfaces then I believe that you need a clock signal on the line and you need LMI for frame-relay or you need to disable keep-alives to disable LMI. You should verify that each end is using the same encapsulation, etc. I could be totally off base though, I'm just trying to throw ideas out there.

            Comment


            • #7
              Re: Configuring Interfaces

              Originally posted by Dippers View Post
              Well, all the router's are all already preset with the cables and such all plugged in. But someone suggested I try setting up IP addresses between each router so that the interface's have something to connect to. So i'm going to try that and see if it works.
              This is not true. A upstate can already exist with a correct cable.

              Please answer Joeqwerty's question and my earlier question.
              Marcel
              Technical Consultant
              Netherlands
              http://www.phetios.com
              http://blog.nessus.nl

              MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
              "No matter how secure, there is always the human factor."

              "Enjoy life today, tomorrow may never come."
              "If you're going through hell, keep going. ~Winston Churchill"

              Comment


              • #8
                Re: Configuring Interfaces

                Cable type is important here. With a Cisco router if you have the cable plugged in even without an address the interface will transition to up/down (if memory serves me right). If you have Ethernet cables plugged into the routers and the interfaces are down/down then you may have straight through cables which will not work if you are not using a switch or hub between the routers. If you are connecting router to router you will need a cross over cable for the Ethernet. If you are connecting serial interfaces then you will need to clock on one of the routers. If you just used the yellow cables (Cisco used to ship with yellow LAN cables) and connected the devices back to back they will not transition to an upstate as they are straight through cables.

                A post of the show interface command would be helpful as the other folks have mentioned.

                Comment

                Working...
                X