Anybody who states an exact threshold for a high rate of Ethernet
collisions, without any reference to the network topology, applications,
and measuring method, is speaking without authority. &;-)
I think that the 0.1% that Cisco likes to claim is based on the comparison
of frames output by the router to all collisions seen on the segment. Two
things to keep in mind: 1) This compares just one station's output rate to
the collision rate, and 2) a router generally prefers better performance
than a generic end station.
I once heard Radia Perlman say, "Do you know how to tell when an engineer
is lying? When he or she uses the word 'always'". Be careful of "rules" and
"checklists." Although I have checklists in my book, I hope people read all
the caveats and explanations that go with them.
Priscilla
At 04:29 AM 8/31/00, Atif Awan wrote:
>Everyone here is to learn and that too the correct thing so please unless
>you are definite of something do not state it with so much authority. If
>my word is not good enough then have a look at the URL :
>
>http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1904.htm
>
>It explicitly states that :
>
>"Use the show interfaces ethernet command to check the rate of collisions.
>The total number of collisions with respect to the total number of output
>packets should be around 0.1 percent or less."
>
>Regards
>Atif
>
>
>-----Original Message-----
>From: Salman Zahid [mailto:[EMAIL PROTECTED]]
>Sent: Thursday, August 31, 2000 9:20 AM
>To: Atif Awan; John Neiberger; [EMAIL PROTECTED]
>Subject: Re: Collisions on Ethernet Lan
>
>
>Normally , if the collisions on the Ethernet segment
>are 10% of the total traffic flowing on the
>segment,then thats not considrered bad.
>Regards,
>SALMAN ZAHID
>--- Atif Awan <[EMAIL PROTECTED]> wrote:
>>20% is way too much man .. i think its 0.1 %
>>
>>-----Original Message-----
>>From: John Neiberger <[EMAIL PROTECTED]>
>>To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>>Date: Wednesday, August 30, 2000 7:36 PM
>>Subject: Re: Collisions on Ethernet Lan
>>
>>
>> >Are you having an excessive number of collisions? Why are you trying to
>> >reduce them? Collisions are there by design. Off
>>the top of my head I
>> >forget what percentage of collisions is considered
>>"Bad", but I believe it
>> >was 20%. Someone will correct me if I'm wrong on
>>that. Unless you are
>> >seeing more than that or it's causing noticable
>>performance problems, don't
>> >worry about it.
>> >
>> >> Hi,
>> >> HOw do I reduce the collisions on the
>>ethernet
>> >> LAN.
>> >> I am using a cisco 2600 router with an ethernet
>> >> port
>> >> My switch is CATALYST 1900 series.
>> >>
>> >> Please help me.
>> >>
>> >> regards
>> >> Raj
>> >>
>> >>
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