my 2 cents. Don't use HUBS in a corp environment, use switches.
I knwo it is expensive, but it is worth the change.
-Apoorva
"Macnee, James (CHHIS CNI Support)" wrote:
> -----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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