Could not Establish Link -- Check if the cable is plugged in.

Posted on 2005-04-11
Last Modified: 2013-12-27

After a recent cisco switch upgrade, the switch lost connection with this sun server. We have to do init 6 to make it visible to the network. And today this server suddenly breaks off connection. We did init 6 again. These are the info in messages file. Can anyone tell me what is going on. Thanks  

Apr 11 13:21:19 aai-sun ge: [ID 451854 kern.notice] SUNW,pci-gem0: Using Gigabit SERDES Interface
Apr 11 13:21:19 aai-sun ge: [ID 451854 kern.notice] SUNW,pci-gem0: Forced 1000 Mbps Full-Duplex Link Up
Apr 11 13:33:39 aai-sun ge: [ID 451854 kern.notice] SUNW,pci-gem0: Could not Establish Link -- Check if the cable is plugged in.
Question by:ebi168
    LVL 1

    Expert Comment

    This looks like u have problem with the network connection itself. pl. change the n/w port that is working and then check.


    Author Comment

    If it is the connection problem, how come init 6 will solve the problem.
    LVL 10

    Expert Comment

    One thought is the cable involved.

    What kinda of ethernet cable are you using ?  CAT5 or CAT5E

    You should NEVER use homemade cables for GigE interfaces.  Sometimes even factory made CAT5 isn't good enough.  You should use CAT5E when you see problems this.

    Author Comment

    I have find out the problem is caused by setting /usr/sbin/ndd -set /dev/ge adv_1000autoneg_cap to 0; it should be 1. Thanks for your effort in help.
    LVL 7

    Expert Comment

    If rebooting resolves the problem then you must hvae your network interface set to auto-negotiate and the router is set to something else.

    Coordinate with your netowrk department and see what speed the port that the server is connected to is running at

    then create a <interface>.conf file in the /platform/<architecture (most likely will be the directory sun4u)>/kernel/drv directory


    If the interface is qfe0 on the server and the network port is running 100/full then you would create a file called qe.conf in the directory mentioned above and type in this


    the 0 turn off the interface to run at those speeds and the 1 to make the interface run at that speed

    hence 1= on .... 0 = off

    After you save this file, confirm that it is the speed you wish to be running at. Then reboot the server. If you have connected at reboot then you are at the correct speed. If it is still dropping on you .. then troubleshoot the port on the NIC andf make sure it is not flaking out

    Hope that helps

    the one turns on the port

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