In a former lifetime I had a number of issues with clients and a Cat 5000
switch. There are a number of reasons that a station will be fine over a hub
and not a switch.
Could need to upgrade the drivers for the NICs
Could need to set the speed and duplex on the client side as well as the
switch
Portfast
Could need new NIC's ( real pain, I tell you )
Of these, the easiest to try and test is the updated NIC drivers for the
workstations. Bet you have old cards and old drivers!
In my case, new 3com 3c905 nics were fine but the older 3com 3c509 were not.
These days, I understand that new 3com drivers correct problems formerly
experienced by the 509's. There have been discussions along this line in the
past. There may be information in the archives.
As a word to the wise, one should never expect to just remove and replace.
One should always do a bit of testing to discover issues like this before
moving new equipment into production. Live and learn :->
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
imran obaidullah
Sent: Thursday, June 01, 2000 9:58 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: Network Troubleshooting
Hi,
Thanks for your information.
The server and the clients in the 1st floor are on the switcha and there is
a uplink which connects the 2nd floor. But to the surprise the people in 2nd
floor are not complaining onlt the clients in the 1st floor started
complaining as soon as I changed them from hub to switch .I tried enabling
port fast for all the ports except uplink and still they have same problem.
Sometimes they can see their neighbour and after few secs you can't see
anyone through NN. Know all ports led is howing green colour but when I try
it to keep to the auto it completely disable or permanently it shows orange.
The NICs are set to auto mode for both the duplex and speed modes.
regards
imran
>From: "Luong, David" <[EMAIL PROTECTED]>
>To: "'Cormac Long'" <[EMAIL PROTECTED]>, imran obaidullah
><[EMAIL PROTECTED]>, [EMAIL PROTECTED]
>Subject: RE: Network Troubleshooting
>Date: Thu, 01 Jun 2000 09:05:50 -0700
>
>Yes, I agree what Cormac has said. In addition:
>
>You will also have to determine what applications they MAC's use in a daily
>basis? If the traffic (client-server) has to go through a many hops to get
>to the remote server either via WAN or different switches/hubs, it would be
>best to place the server (or server farms) closer to the demand nodes such
>as your MACS. Therefore, the resource nodes such as the servers are
>located
>strategically closer to the demand nodes and thus, not only providing
>better
>bandwidth but also minimize starvation of bandwidth between inter-segment
>links.
>
>David Luong, CCNA,Network+,A+,i-Net+
>Telecommunications Analyst
>Insurance Corporation of B.C.
>Vancouver, B.C CANADA
>
>
>-----Original Message-----
>From: Cormac Long [mailto:[EMAIL PROTECTED]]
>Sent: Thursday, June 01, 2000 3:48 AM
>To: imran obaidullah; [EMAIL PROTECTED]
>Subject: Re: Network Troubleshooting
>
>
>Just some points to note here before you get into any
>fancy management software.
>
>1. You should not trust autonegotiation of speed or
>duplex. The autonegotiation protocols are very poorly
>standardized. Be clear on what speed and duplex each
>port/station can support and configure the switch
>settings accordingly.
>
>2. A speed mismatch will render the port inoperable. A
>duplex mismatch won't (i.e. the light will remain
>green) but performance will suffer badly due to the
>duplex mismatch which makes it very dangerous.
>
>3. When you connect to a switchport initally it will
>remain orange for about 50 seconds in any case while
>it waits for spanning tree to resolve itself. So don't
>be fooled by this. You can put it into immediate
>forwarding using the "portfast" feature. However don't
>disable spanning tree on inter-switch links!
>
>4. In terms of the value gained by a switch, it is
>also important to understand your client-server
>traffic flows. For example a switch would give limited
>benefit if most traffic had to cross the WAN to a
>remote server.
>
>Regards,
>
>Cormac Long, CCSI#21600
>http://www.cormaclong.com
>
>--- imran obaidullah <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > I have a network of around 20 macs connected to the
> > hub and all accessing
> > the internet through a single internet box which is
> > ip based. I have
> > replaced the hub with catalyst 3500 and when I
> > connect the mac to the switch
> > the led on the port is showing orange colour and
> > then I made the all the
> > port to full duplex, speed 100 then the switch
> > started working.
> >
> > I think the nic in mac is not auto negotiating with
> > switch port. But the
> > users are complaining that the network is very slow
> > and internet access
> > speed also has come down.
> >
> > I really could not diagnoise the problem because the
> > switch should give
> > better performance than hub. Is there any
> > troubleshooting procedues through
> > which I can find out the problem. is there any
> > software on the net which
> > will show me the bottleneck. If any body has got
> > information, please send it
> > to me.
> >
> > regards
> >
> > imran
> >
>________________________________________________________________________
> > Get Your Private, Free E-mail from MSN Hotmail at
> > http://www.hotmail.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]
>
>
>=====
>http://www.cormaclong.com
>
>__________________________________________________
>Do You Yahoo!?
>Send instant messages & get email alerts with Yahoo! Messenger.
>http://im.yahoo.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]
________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.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]
___________________________________
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]
