-----Original Message-----
From: Macnee, James (CHHIS CNI Support)
Sent: Wednesday, June 28, 2000 2:36 PM
To: 'Chuck Larrieu'
Subject: RE: Counters
Thanks for all that info.
This network that I am maintaining supports about 500 PC,s. We have a fibre
ring in which 4 catalyst switches come off, these are the 1200 series ones.
>From there it ventures off into many hubs and routers. Not one of our
servers are connected directly to the switch. They all come off hubs. The
hub that I am concerned about has our mail server on it, has also the
server which stores the home directories. It has all the group drives. It
also has the printers for one subnet. It has three routers which one is the
main one for the whole site.
I have been doing a little monitoring on it and find that according to mrtg
it has an average usage of 2.7% and max of 46%. These figures seem so small
but when I look at the amount of collisons on that port they seem extremely
large.
The proposal for port 3 is to have a switch connected to it rather that a
hub. What do you think about that? This port would be only be 10mbps.
I am not to sure if that would fix it the traffic problem.
Would it be a good idea to put another switch on the fibre ring and plug all
the servers into that. Do you think that would fix it, and can you actually
just cut the fibre ring and add a switch in? If so how long would that take
remembering that this company is a 24 hour production mill.
Thanks again for all your help
James Macnee
-----Original Message-----
From: Chuck Larrieu [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 28, 2000 12:56 PM
To: Macnee, James (CHHIS CNI Support)
Subject: RE: Counters
Whooooaaaaa!!!!! Bet your booties you have collision problems on port
3!!!!!!!!
My quick read on CCO is that you have a low end switch with 8x10baseT and
2x100baseT ethernet ports. Correct? My read of the literature is that the
1200 is half duplex only on the 10baseT ports. Correct?
The product is listed as end of life, meaning no more being made, and
probably no upgrades available.
In the old days, one bought a switch to segment one's network. One usually
plugged servers directly into the switch, and move users onto smaller hubs,
which in turn connected to switch ports.. The idea was to move traffic in
and out of the servers as quickly as possible, with as few errors as
possible. And have smaller collision domains for users.
A hub is a half duplex shared medium device. So all of your servers are
still contending for space on that hub, which in turn is contending for
space on the single switch port.
In general, you want your high access, high volume devices, such as servers,
to have their own dedicated ports, and full duplex if possible.
Question 1. Are your users complaining?
Question 2. Does your boss have arms long enough to reach into his pocket to
get his wallet? :->
Seriously, you have performance issues on your server segment. If there is
some way to give each server a dedicated port on the switch, and move more
users onto shared hubs, this would help. If you do indeed have two 100baseT
ports, you might consider moving your two heaviest use servers into those
ports, and go from there. ( make sure the server NIC's support 100baseT )
Or you may want to ask the boss about purchasing something like a 1924, or
maybe a 2924, giving you a bit of flexibility and room for growth. I gather
you may be a smaller company, and dollars might be a bit tight. You
definitely want to sell the performance and service issues.
By placing four servers into a single collision domain, and expecting them
to share not only the hub, but the switch port as well, you have definitely
created a bottleneck, which is the source of your collisions.
Best wishes.
chuck
-----Original Message-----
From: Macnee, James (CHHIS CNI Support) [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 27, 2000 5:15 PM
To: 'Chuck Larrieu'
Subject: RE: Counters
Port 3 has 4 servers and a few routers from a hub.
With the IOS on 1200 Catalyst switch how can I look to see if it is full or
harf duplex. Also I on the other end it is a synoptic hub how can I know if
that supports full duplex. Do I have to config that as well?
James
-----Original Message-----
From: Chuck Larrieu [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 28, 2000 11:53 AM
To: Macnee, James (CHHIS CNI Support)
Subject: RE: Counters
What's plugged into port 3? Server? Busy server? You might want to
configure server NIC and switch port to full duplex.
Alignment error - keep an eye out. Might or might not be indicative.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Macnee, James (CHHIS CNI Support)
Sent: Tuesday, June 27, 2000 4:02 PM
To: '[EMAIL PROTECTED]'
Subject: Counters
Hi all
I am monitoring some counters on a 1200 series catalyst switch and would
like to know what to expect and what is to high.
For example when I use the show port command I get 147697 single col and
201750 Multi col on port 3. this is in a time period of 40 hours. On
another port I have got 19 alignment errors in that time.
Can anyone out there help me?
James
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