Collisions on Ethernet Lan

2000-08-30 Thread cisco

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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RE: Collisions on Ethernet Lan

2000-08-30 Thread Suresh Uniyal

Go for VLAN.

-SU

> -Original Message-
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, August 29, 2000 11:55 PM
> To:   Groupstudy Cisco
> Subject:      Collisions on Ethernet Lan
> 
> 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
> 
> -
> This mail sent through  http://www.sify.com
> 
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Re: Collisions on Ethernet Lan

2000-08-30 Thread John Neiberger

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
>  
>  -
>  This mail sent through  http://www.sify.com
>  
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Re: Collisions on Ethernet Lan

2000-08-30 Thread Atif Awan

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
>>
>>  -
>>  This mail sent through  http://www.sify.com
>>
>>  ___
>>  UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>>  FAQ, list archives, and subscription info: http://www.groupstudy.com
>>  Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
>
>
>
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Re: Collisions on Ethernet Lan

2000-08-30 Thread John Neiberger

You're right! I was thinking of broadcasts, which shouldn't exceed 20%.  I
think 0.1 % is a little low, though.  The collision rate can be fairly high
before you'll notice much of a degradation in performance.  I just took a
look at a fairly busy ethernet port on our main router and it was showing a
4.4% collision rate.  I personally wouldn't get worried unless the rate was
pushing 10%.

>  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
>  >>
>  >>  -
>  >>  This mail sent through  http://www.sify.com
>  >>
>  >>  ___
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>  >>  Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
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>  >
>  >
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RE: Collisions on Ethernet Lan

2000-08-30 Thread Shawn Bowen

You shouldn't have any (or very little) collisions on a switch, it is by
definition a point to point virtual circuit.  Since there are only two
nodes, it is unlikely that they will transmit at the same time.  I would use
Full Duplex if you can, then you CAN NOT have collisions by definition.  Nor
should you see that many CRC's, runts, fragments, giants or other such crap.
If the switch is in cut-through mode then it will spew crc's, runts, and
everything out through all the interfaces that the traffic is destined for.
I agree that collisions are a part of standard Ethernet, but not for Full
Duplex Ethernet.  The only time you will see collisions on full duplex links
is from certain OS's (Netware to mention one), and they use them illegally
for back off flow control, this is not part of the Ethernet Spec and is a
kluge.

Shawn

 -Original Message-
From:   [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]  On Behalf Of
Atif Awan
Sent:   Wednesday, August 30, 2000 6:11 PM
To: John Neiberger; [EMAIL PROTECTED]
Subject:        Re: Collisions on Ethernet Lan

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
>>
>>  -
>>  This mail sent through  http://www.sify.com
>>
>>  ___
>>  UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>>  FAQ, list archives, and subscription info: http://www.groupstudy.com
>>  Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
>
>
>
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Re: Collisions on Ethernet Lan

2000-08-30 Thread Salman Zahid

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
> >>
> >> 
>
-
> >>  This mail sent through  http://www.sify.com
> >>
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RE: Collisions on Ethernet Lan

2000-08-30 Thread Atif Awan


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
> >>
> >>
>
-
> >>  This mail sent through  http://www.sify.com
> >>
> >>  ___
> >>  UPDATED Posting Guidelines:
>http://www.groupstudy.com/list/guide.html
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>to [EMAIL PROTECTED]
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> >
> >
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Re: Collisions on Ethernet Lan

2000-08-30 Thread Oz


 I think the mix up is  some folks are talking about the segment in the LAN
IE  host to host  via an hub, switch  etc.
 The LAN segment is the issue

Whilst your quote is correct it's  describing a router NOT   a LAN loaded up
with hosts


Oz
http://www.mcseco-op.com/helpfull_links.htm
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."
Ethernet0 is up, line protocol is up
  Hardware is Lance, address is 0010.7b81.6482 (bia 0010.7b81.6482)
  Description: connected to Cisco1548
  Internet address is 216.203.29.106/27
  MTU 1500 bytes, BW 1 Kbit, DLY 1000 usec,
 reliablility 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 1/75, 0 drops
  5 minute input rate 1000 bits/sec, 2 packets/sec
  5 minute output rate 1000 bits/sec, 2 packets/sec
 4281 packets input, 493175 bytes, 0 no buffer
 Received 3214 broadcasts, 0 runts, 0 giants, 0 throttles
 1 input errors, 0 CRC, 0 frame, 0 overrun, 1 ignored
 0 input packets with dribble condition detected
 15597 packets output, 1478611 bytes, 0 underruns
 0 output errors, 0 collisions, 3 interface resets
 0 babbles, 0 late collision, 1 deferred
 0 lost carrier, 0 no carrier
 0 output buffer failures, 0 output buffers swapped out

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RE: Collisions on Ethernet Lan

2000-08-31 Thread Rossetti, Stan

You are correct!!  Look at the Cisco Internetworking Troubleshooting
Handbook pg 78.

-Original Message-
From: Atif Awan [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 30, 2000 11:30 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: Collisions on Ethernet Lan



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
> >>
> >>
>
-
> >>  This mail sent through  http://www.sify.com
> >>
> >>  ___
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>http://www.groupstudy.com/list/guide.html
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>to [EMAIL PROTECTED]
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RE: Collisions on Ethernet Lan

2000-08-31 Thread Brett Johnson

There are too many unknown values to say that .01% collision rate or 10%
collision rate
is "unacceptable".  What is the distance between the switch and the
workstation, what is the average
packet size, what is the utilization level of the line .  Cisco may
state that .01% is 
correct and that is what you should use on the test, but in the real word
you cannot assign an
arbitrary number and say it is bad, unless it is 100% of course.  There have
been tests done
where Ethernet runs fine at 60% collisions, but that was in a controlled
environment.  Collisions
by their nature are not bad that is how Ethernet works.  One of the easiest
ways to determine
if you have too many collisions is "Is the performance deteriorating".  And
you have your network
baselined you can always go against the baseline.  Just some thoughts.  

Brett Johnson

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RE: Collisions on Ethernet Lan

2000-08-31 Thread Priscilla Oppenheimer

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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>>to [EMAIL PROTECTED]
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>> >
>> >
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Priscilla Oppenheimer
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RE: Collisions on Ethernet Lan

2000-08-31 Thread Swart Douwe

I think Cisco have it down in there DCN book as anything greater than 30%
represents problems

But they say this is just a base figure...and that it may vary either side
slightly

HTH

Douwe


-Original Message-
From: John Neiberger [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 31, 2000 1:23 AM
To: [EMAIL PROTECTED]
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
>  
>  -
>  This mail sent through  http://www.sify.com
>  
>  ___
>  UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>  FAQ, list archives, and subscription info: http://www.groupstudy.com
>  Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]





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RE: Collisions on Ethernet Lan

2000-08-31 Thread Swart Douwe

My apologiesI was thinking of utilisation
Well, at least you have an answer fot utilisation if anyone wants to know
that.



-Original Message-
From: Swart Douwe [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 01, 2000 8:31 AM
To: 'John Neiberger'; [EMAIL PROTECTED]
Subject: RE: Collisions on Ethernet Lan


I think Cisco have it down in there DCN book as anything greater than 30%
represents problems

But they say this is just a base figure...and that it may vary either side
slightly

HTH

Douwe


-Original Message-
From: John Neiberger [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 31, 2000 1:23 AM
To: [EMAIL PROTECTED]
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
>  
>  -
>  This mail sent through  http://www.sify.com
>  
>  ___
>  UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>  FAQ, list archives, and subscription info: http://www.groupstudy.com
>  Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]





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