"Al" <[log in to unmask]> writes:
>We just installed a series of Cisco Switches. The Show Command on the
>Switches usually gives you a good picture of what is going on on that port.
>Also the Engineer who installed our Switches, had a software called Sniffer
>on his laptop where he could monitor the whole of the network including the
>protocols running. Sniffer is a Network Associate product, and cheap I
>believe.

Depends on what version you get.  But SnifferPro and cheap are usually
mutually exclusive! <G>

>BTW. I wonder if you could share your experience with us on these switches.
>We have 2 HP3K 928 with 10M NIC and three DTCs and BNC connectors all
>sharing a Thin Ethernet and  conntected to HUB and then into a port in one
>of our Cisco Switches.
>Some of our users connect via serial link, DTC to the 3Ks and others connect
>using Reflection. Those using Reflection keep getting disconnected. Those
>using serial link are not affected. We have monitored the Cisco port that is
>connected the 3Ks HUB and there are massive collisions all the time on this
>port. All Reflection users are set at 10M still people getting disconnected.
>We have been advised by Cisco Engineer that we must get rid of the Thin
>Ethernet and connect the 3Ks and DTCs directly to the Switches.


Get rid of the thin ethernet segment if you are having physical plant
problems.  This is very common in thinnet networks.  One problem T
connector will affect eVERYONE on that segment.  Terminal emulation
programs (like reflection) generally do not take up a lot of bandwidth.
I doubt collisions are your problem.  They almost never are.  More
likely, you have a thinnet problem.


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Hansang Bae        Director of Network Operations, Eastern Region
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Specializing in Network Design/Troubleshooting and Protocol Analysis
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