Cisco Switches connections over ethernet

Posted on 2009-12-30
Last Modified: 2012-05-08

I have three switches 3560-E Series, 3560-G Series and 2960. I am trying to cascade three over straight ethernet cable. But there is no connection status on trunk ports.

I have tried below connections

3560-E -------3560-G
3560-E -------2960
2960    -------3560-G

None of above worked,, switches are configured in a managed mode and with different Vlans. But here i dont see status light on any of the ports which I am trying to connect.

Does it mean a cross over cable required? I did not try it but just need to know if this is the reason.

Question by:pkabbas
    LVL 7

    Expert Comment

    Yes you will need crossovers.  Standard cables fit switches (DCE) to PC's etc (DTE).  You need the crossover to switch over the transmit and receive pairs going from DCE to DCE
    LVL 50

    Expert Comment

    by:Don Johnston
    You correct that you need a crossover cable between the switches.

    However DTE and DCE are serial communications designations.

    Ethernet uses MDI for PC's, routers, and bridges. MDI-X defines ports on switches and hubs.

    LVL 8

    Expert Comment

    i don't think cable is an issue. its an issue with trunk configuration. 3560E support both uplink over cross over and stright through. (AutoMdix)

    Please port your trunk config.
    LVL 21

    Expert Comment

    The indiviual ports may be in shutdown mode, the VLAN's may be in shutdown mode, or there may be an issue with your trunking/access settings.  You should not need a crossover cable, I connect switches to each other by their eithernet ports all the time when I'm testing configs and don't have GBIC's and fiber on hand.  You would need a cross over cable if you're going to connect 2 PC's directly to each other.

    Accepted Solution

    Hi,, yeh got it fixed. There was spanning-tree bpduguard was enable, after disabling it worked.


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