RE: Broadcast Control in 3550

From: simon hart (simon@harttel.com)
Date: Sun Sep 25 2005 - 15:06:53 GMT-3

Hi Mushtaq,

Interesting!! I have just had a look at my 3550's and I do not have access
to this command either :( Will have a look to see if it is an IOS thing

Simon
  -----Original Message-----
  From: Mushtaq A. Khan [mailto:mak.ccie2b@gmail.com]
  Sent: 25 September 2005 18:33
  To: simon hart
  Cc: Cisco certification
  Subject: Re: Broadcast Control in 3550

  Simon,

  i understand the point. All I want to say is that my switch does not
provide me an option to set any action by using storm-control action
{shutdown | trap } as shown on cisco website.

  The only option my switch provide is:

  sw1(config-if)#storm-control ?
    broadcast Broadcast address storm control
    multicast Multicast address storm control
    unicast Unicast address storm control

  Is there any particular reason for this? Don't I have the right IOS
running on the switch?

  Mushaq

  On 9/25/05, simon hart <simon@harttel.com> wrote:
    Mushtaq,

    With the storm control the algorithm will drop packets by default.

    If I configure on Fa0/1 (100mb) :- storm-control unicast level 50. I am
    telling the IOS that on this port if unicast traffic exceeds 50% of
    configured bandwidth (in this case 50mb) within a finite time period,
then
    drop all further unicast packets until unicast packets drop below the
50%
    threshold. The time period by default is 1 second.
    It really is all or nothing. If you go over the threshold everything
    further gets dropped. If it falls below 50% in the following second then
    everything gets passed again. The configuration guide does provide a
good
    and thorough explanation

    http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225sec/3550s
cg/s
    wtrafc.htm

    Now you can modify the default storm-control action as you have pointed
out:
    Shutdown will put the port into err-disable state, trap will generate an
    snmp trap (and will drop packets).

    HTH

    Siimon

    -----Original Message-----
    From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
    Mushtaq A. Khan
    Sent: 25 September 2005 14:36
    To: Cisco certification
    Subject: Broadcast Control in 3550

    I doing a very simple thing to control broadcast traffic on one of the
FE
    port in 3550. I have no problem in configuring this, however, I want the
    port to be blocked once it reaches the threshold. Switch doesn't give me
    such option even though the command (*storm-control action* {*shutdown*
| *
    trap*} is available on cisco website. I'm running IOS: 12.1(22)EA1a on
the
    switch. Does anyone has any clue?
    Thanks,
    Mushtaq

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