Just to be argumentative, it is not necessarily true that 500 hosts on a
single network / wire will result in a crippled network. As always, it is
the usage that will determine the result.
I once interviewed with a very large bank. The network team there was
required to have extensive protocol analysis expertise because, in the words
of the interviewer, we have very large segments, and we want to eliminate
problems as son as we hear about them. He told me they had as many as 1200
machines on a subnet!!!!! Obviously, in most circumstances, the network
folks believed that performance was satisfactory. They did apparently spent
a lot of time tracking down misbehaving NIC's :->
Cisco's published recommendations about maximum hosts on a subnet /
broadcast domain are general recommendations. I suggest that if you have
folks doing extensive sharing of Autocad files, or extensive desktop video
conferencing, or extensive VoIP, even the Cisco recommendations may be too
large for reliable LAN performance. On the other hand, if all you are doing
is SNA emulation. 500 may not be bad at all.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Donald B Johnson Jr
Sent: Friday, November 10, 2000 9:00 AM
To: jeongwoo park; Groupstudy
Subject: Re: Why not supernetting?
Your problem seems to be insufficient hardware.
Supernetting five subnets and putting 500 stations on one segement will
cripple your network.
Duck
----- Original Message -----
From: jeongwoo park <[EMAIL PROTECTED]>
To: Groupstudy <[EMAIL PROTECTED]>
Sent: Wednesday, November 08, 2000 2:13 PM
Subject: Why not supernetting?
> Hi All,
>
> I am looking for advice on a LAN performance issue. i
> am running primarily NT4 and win2K boxes on a 100Mbit
> UTP Ethernet LAN.
>
> my servers are on static IPs on one subnet while my
> clients pick up DHCP addresses (assigned out of my
> control) in any one of half a dozen other subnets.
> file transfer and printing performance between client
> and server is averaging 1Mbit/sec when computers are
> in different subnets. switch the same two computers to
> static IPs in the same subnet and throughput jumps to
> a respectable 30-70Mbit/sec. i need to keep the
> clients on DHCP as i don't have enough static IPs to
> go around for the subnet the servers are in.
>
> all clients and servers are attached to one of 5
> Allied Telesyn 8126XL 24-port managed switches. all 5
> of these "edge" switches connect to another switch of
> the same model with a 100Mbit multi-mode (1300
> nanometer) fiber uplink which connects to a Cisco
> Catalyst 5500 for our routing needs.
>
> When the clients are on different subnets the file
> transfers appear to take a long trip through the
> router with a huge performance penalty (1Mbit/sec).
> when the client and server are on the same subnet the
> packets do NOT appear to be routed (perhaps they are
> handled using ARP?) and the performance is very good.
> ping response times on both switches and routers is
> under 20ms. This is where I believe supernetting could
> be a solution to this slowness, because I think
> supernetting allows me to put all stations in the same
> subnet, witch avoids routing needs.
>
> I got some responses to my previous post from people
> saying that supernetting would slow down the speed
> because there would be too many stations in big
> broadcast domain, which contradicts what I am willing
> to do.
>
> Am i missing some key concepts here that might improve
> my understanding of this tragic performance?
>
>
> any help would be greatly appreciated.
>
> take care,
>
> jw
>
>
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