Regarding Macs and Spanning Tree here is a link:
http://til.info.apple.com/techinfo.nsf/artnum/n30922
To repeat
Set portfast on each port that has only one computer attached.
Set the speed and duplex on each port of the switch.
Set the speed and duplex on each computer.
Never trust auto-negotiation.
You just mentioned "NN". Sounds like Network Neighborhood on PCs as opposed
to Macs as in your first post. If PCs check who your local Browse Master is.
How about all you MSAEs out there lending a hand?
> -----Original Message-----
> From: imran obaidullah [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, June 01, 2000 11:58 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
>
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