damn loop

Discussion in 'Cisco' started by John Smith, Mar 14, 2005.

  1. John Smith

    John Smith Guest

    Hi,





    I have a new cisco 2970 switch.

    I need to turn off all non IP and non arp traffic.



    I have cdp turned off with no cdp run.

    I have spanning tree gone with

    no spanning-tree vlan 1



    I still see this loopback protocol on each port every 10 seconds.



    How do I turn it off.?

    I tried the documented commands but they don't work.

    No spanning-tree loopguard disable

    spanning-tree loopguard disable

    no spanning-tree loopguard enable



    I tried a few other ones but can't stop the traffic.



    I am running ios 12.1





    I used to always buy cisco but I am definitely seeing my support from them
    drop in quality. Has anyone else considered major migrations away from
    cisco products to either hatachi , HP, juniper , or whatever? Cisco works
    or used to work well when all the equipment is cisco and at the same IOS.
    But I can't maintain a pure cisco network at the same ios.





    Sorry for the rant but simple configs should be simple to do.



    Thanks in advance
     
    John Smith, Mar 14, 2005
    #1
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  2. John Smith

    Dan Daniels Guest

    "John Smith" <> wrote in message
    news:...
    > Hi,
    >
    >
    >
    >
    >
    > I have a new cisco 2970 switch.
    >
    > I need to turn off all non IP and non arp traffic.
    >
    >
    >
    > I have cdp turned off with no cdp run.
    >
    > I have spanning tree gone with
    >
    > no spanning-tree vlan 1
    >
    >
    >
    > I still see this loopback protocol on each port every 10 seconds.
    >
    >
    >
    > How do I turn it off.?


    Router(config-if)no keepalive

    >
    > I tried the documented commands but they don't work.
    >
    > No spanning-tree loopguard disable
    >
    > spanning-tree loopguard disable
    >
    > no spanning-tree loopguard enable
    >
    >
    >
    > I tried a few other ones but can't stop the traffic.
    >
    >
    >
    > I am running ios 12.1
    >
    >
    >
    >
    >
    > I used to always buy cisco but I am definitely seeing my support from
    > them drop in quality. Has anyone else considered major migrations away
    > from cisco products to either hatachi , HP, juniper , or whatever?


    Yes.

    > Cisco works or used to work well when all the equipment is cisco and at
    > the same IOS. But I can't maintain a pure cisco network at the same ios.
    >
    >
    >
    >
    >
    > Sorry for the rant but simple configs should be simple to do.
    >
    >
    >
    > Thanks in advance
    >
    >
    >
    >
     
    Dan Daniels, Mar 14, 2005
    #2
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  3. > I still see this loopback protocol on each port every 10 seconds.
    >
    >
    >
    > How do I turn it off.?



    interface (mumble)
    no keepalive

    This is not a spanning tree packet. This is a packet used by Cisco routers
    from the beginning of time to test for soft network failures.

    Why do you want the device to send no traffic at all?

    > I used to always buy cisco but I am definitely seeing my support from
    > them drop in quality.


    If you have some specific examples you'd like to tell me about, drop a note
    to .

    > But I can't maintain a pure cisco network at the same ios.


    Can you be more specific? Is the fact that different product lines
    (switches routers) run different versions of code the issue? How so?

    > Sorry for the rant but simple configs should be simple to do.


    I agree. Usually, it is not a good idea to turn off all diagnostic packets,
    but I assume you have a business reason for the switch to be dead silent.
    You just run some risks doing that, including looped links (no spanning
    tree), soft-link failures (no loopback), or invisibility to management
    stations (no CDP).
     
    Phillip Remaker, Mar 14, 2005
    #3
  4. John Smith

    Zee Guest

    "Phillip Remaker" <> wrote in message
    news:QZhZd.10081$...
    > > I still see this loopback protocol on each port every 10 seconds.
    > >
    > >
    > >
    > > How do I turn it off.?

    >
    >
    > interface (mumble)
    > no keepalive
    >
    > This is not a spanning tree packet. This is a packet used by Cisco

    routers
    > from the beginning of time to test for soft network failures.
    > ]

    the catalyst switch series doesn't send it, at least not by default.

    > Why do you want the device to send no traffic at all?
    >


    To measure distributed application traffic and capture it during tests.
    Also a few other reasons.

    > > I used to always buy cisco but I am definitely seeing my support from
    > > them drop in quality.

    >
    > If you have some specific examples you'd like to tell me about, drop a

    note
    > to .
    >
    > > But I can't maintain a pure cisco network at the same ios.

    >
    > Can you be more specific? Is the fact that different product lines
    > (switches routers) run different versions of code the issue? How so?
    >

    Try doing an etherchannel between one of the catalyst 2900's that were end
    of lifed last November to the new 2970 series. It will work for a while but
    then the old catalyst will start receiving a lot of errors and become
    unusable. It will only work with one cable. Yes, I pinned both sides to
    100/ full

    > > Sorry for the rant but simple configs should be simple to do.

    >
    > I agree. Usually, it is not a good idea to turn off all diagnostic

    packets,
    > but I assume you have a business reason for the switch to be dead silent.
    > You just run some risks doing that, including looped links (no spanning
    > tree), soft-link failures (no loopback), or invisibility to management
    > stations (no CDP).
    >
    >
    >

    I agree in a large network this is a very bad idea. But when testing
    equipment ,software and taking measurements you really need a easy way to
    make a switch to spew anything that you'll have to keep track of.

    Just a suggestion from a user.

    Ending on an up side the web interface is getting better in the new
    switches.
     
    Zee, Mar 17, 2005
    #4
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