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8913 Views 9 Replies Latest reply: Oct 30, 2008 6:38 AM by Conwyn RSS

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What topology is best?

Oct 28, 2008 10:20 PM

Jason 16 posts since
Sep 15, 2008

I want to practice vlan trunking, mac, ip,port discovery and running protocols . I have two routers and two switches. should I connect the two switches by one cable to any port on either switch and then connect router 1 to switch 1 thru router 1's AUX port to one of switch 1's ports then router 2 to switch 2 in the same fasion, then console in thru one of the routers, then practice on my trunking and routing that way? or is there a better set up?

  • Chetan 539 posts since
    Jul 26, 2008
    Currently Being Moderated
    1. Oct 28, 2008 10:52 PM (in response to Jason)
    Re: What topology is best?

     

    Hi Jason,

     

     

    To learn the specified topics, one should always try with different topologies.

     

     

    I think different topologies help you understand the concepts really well.

     

     

    I feel that NO single topology is BEST for learning and understanding every thing.

     

     

    Here are some sample topologies that you can try with 2 routers and 2 switches.

     

     

    In these samples, I have used Crossover, straight-thro and serial-cables.

     

     

    You can CONSOLE to any device depending upon what and where do you want to experiment with..

     

     

    I Hope this helps..

     

     

    Attachments:
  • Conwyn 7,914 posts since
    Sep 10, 2008
    Currently Being Moderated
    3. Oct 28, 2008 11:56 PM (in response to Jason)
    Re: What topology is best?

     

    Hi Jason

     

     

    You connect the router Ethernet port to the switch Ethernet ports.

     

     

    You can connect the router AUX to another router AUX with a roll over cable.

     

     

    You can connect a router Ethernet to a switch as a trunk. See the router on a stick document.

     

     

    If you need help come back.

     

     

    Regards Conwyn

     

     

     

     

     

     

     

     

  • Chetan 539 posts since
    Jul 26, 2008
    Currently Being Moderated
    4. Oct 29, 2008 12:27 AM (in response to Jason)
    Re: What topology is best?

     

    You asked, " can switches trunk with a router between them? "

     

     

    The answer is YES. This is possible.

     

     

    This particular topology can be useful when you want inter-vlan communication without using Router-On-A-Stick Model.

     

     

    Check out the following link for above topology as well as some more useful information:

     

     

    http://www.cisco.com/en/US/docs/switches/lan/catalyst5000/hybrid/routing.html#wp13354

     

     

     

     

     

    As far as Cable Connections are concerned, I think Conwyn has already answered that question.

     

     

     

     

     

  • Scott Morris - CCDE/4xCCIE/2xJNCIE 8,396 posts since
    Oct 7, 2008
    Currently Being Moderated
    5. Oct 28, 2009 10:53 AM (in response to Chetan)
    Re: What topology is best?

    As a note, without making things truly complicated (way beyond where you want to start!) the router can trunk, but it's designed to do that for routing, not forwarding in the "normal" fashion.

     

     

    The big thing you'll miss out on is spanning-tree. While some may view this as not a bad thing, I suggest that it's a good thing to be familiar with!

     

     

    With that in mind, if you can get your hands on a third switch, so you can design a nicely "looped" topology, that will help you understand the nuances of spanning tree MUCH better!

     

     

    HTH,

     

     

    Scott

  • Conwyn 7,914 posts since
    Sep 10, 2008
    Currently Being Moderated
    7. Oct 30, 2008 12:55 AM (in response to Jason)
    Re: What topology is best?

    Hi Jason

     

    AUI = Attachment Unit Interface = Ethernet = DB15 connector

    CON = Console Port

    AUX = Modem port or Roll over cable

    SER = Serial Ports such as X21 V35 = DB60 connector

     

    See http://www.cisco.com/en/US/docs/routers/access/2500/2501/software/user/guide/ovr.html and

    see http://www.2000trainers.com/cisco-ccna-06/ccna-router-ethernet-ports

     

    You will need a transceiver which converts from DB15 to RJ45 or co-axial

     

    Regards Conwyn

  • Scott Morris - CCDE/4xCCIE/2xJNCIE 8,396 posts since
    Oct 7, 2008
    Currently Being Moderated
    8. Oct 30, 2008 6:25 AM (in response to Jason)
    Re: What topology is best?

    While you can indeed do routing over the AUX port, it is not really a simple or recommended way to cable your network! It is designed for connecting a MODEM for out of band management capability.

     

    On a 2500 series router, you'll use an ethernet transciever (yup, definitely old-school) to get a whopping 10-meg connection!

     

    But it keeps life interesting and a healthy perspective on why current trends are much cooler! hehehe...

     

    So in a 2501, you will have one ethernet port and two DB60 serial ports to play with.

     

    Good luck on your studies!

     

    Scott

  • Conwyn 7,914 posts since
    Sep 10, 2008
    Currently Being Moderated
    9. Oct 30, 2008 6:38 AM (in response to Jason)
    Re: What topology is best?

     

    Hi Jason

     

     

    As Scott said you can route over your AUX port but you need a rollover cable 1->8 etc

     

     

    Joking but it might be easier to find a cable nowadays than a transceiver.

     

     

    Regards Conwyn

     

     

    interface Async65

    ip address 192.168.1.2 255.255.255.0

    encapsulation ppp

    keepalive 5

    async default routing

    async mode dedicated

     

     

    line aux 0

    no exec

    modem InOut

    stopbits 1

    speed 38400

    flowcontrol hardware

     

     

     

     

     

     

     

     

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