Cisco Systems Systems can be 1-3 kms apart; 1 or multiple LANs?
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Systems can be 1-3 kms apart; 1 or multiple LANs? qazmlp1209 04-02-07
Posted by on April 2, 2007, 7:17 am
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We need to keep the server(server-1) and the clients which connect to
this server, within the campus distance(1-3 km).
We have other servers also, as part of the network.

I would like to know whether it is a good idea to keep the server-1
and its clients as part of the same LAN, or different LANs(and they
communicate via the router). What are the factors that I should
consider to decide this. For the time being, please ignore the VLAN
configuration for it.


Posted by on April 2, 2007, 8:38 am
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On 2 Apr, 12:17, qazmlp1...@rediffmail.com wrote:
> We need to keep the server(server-1) and the clients which connect to
> this server, within the campus distance(1-3 km).
> We have other servers also, as part of the network.
>
> I would like to know whether it is a good idea to keep the server-1
> and its clients as part of the same LAN, or different LANs(and they
> communicate via the router). What are the factors that I should
> consider to decide this. For the time being, please ignore the VLAN
> configuration for it.

Hello,

With such small distances, the distance as such is not
relevant as to whether to choose once VLAN design
over another.

What is relevant is the relative location of the clients and servers
with respect to the communications channels available and
the bandwidth of those channels relative to the expected traffic
levels.

Cisco now has some excellent documents on its web site.
Look for "System Reference Network Design" (SRND) for
"Campus" networks.

http://www.cisco.com/en/US/netsol/ns656/networking_solutions_program_category_home.html

These days the move is towards more and more layer 3
and less and less layer 2. L3 switches can run at wire rate on
all ports so there are no longer the performance limitations
of routers to consider in many cases. The industry has moved to
having servers centralised (in the network topology and
physically too) and clients distributed as required with
client VLANS being chosen based on location. (Wireless
can be different).

That's all for now, good luck.


Posted by on April 2, 2007, 10:38 am
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On Apr 2, 5:38 pm, B...@hotmail.co.uk wrote:
> On 2 Apr, 12:17, qazmlp1...@rediffmail.com wrote:
> Cisco now has some excellent documents on its web site.
> Look for "System Reference Network Design" (SRND) for
> "Campus" networks.
>
> http://www.cisco.com/en/US/netsol/ns656/networking_solutions_program_...
That was a nice article and it was useful.

Btw, I would like to know what exactly/roughly can be the maximum
distance for a Campus network.
I understand that as we use L3 switches for the systems in the 2 LANs
to communicate, the distance can be more. But, still I feel there must
be a standard/typical definition for the Campus network and it must
mention about the distance.


Posted by on April 2, 2007, 9:14 pm
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On 2 Apr, 15:38, qazmlp1...@rediffmail.com wrote:
> On Apr 2, 5:38 pm, B...@hotmail.co.uk wrote:> On 2 Apr, 12:17,
qazmlp1...@rediffmail.com wrote:
> > Cisco now has some excellent documents on its web site.
> > Look for "System Reference Network Design" (SRND) for
> > "Campus" networks.
>
> >http://www.cisco.com/en/US/netsol/ns656/networking_solutions_program_...
>
> That was a nice article and it was useful.
>
> Btw, I would like to know what exactly/roughly can be the maximum
> distance for a Campus network.
> I understand that as we use L3 switches for the systems in the 2 LANs
> to communicate, the distance can be more. But, still I feel there must
> be a standard/typical definition for the Campus network and it must
> mention about the distance.

Why?

One thing is that the performance of file systems, database servers
etc. diminishes with network round trip time but
other than for special purposes this is not an issue over
10s or 100s of km. It is an issue over 1000s of km.
Research "Bandwidth delay product" if you are interested.

With the distances you mention there are no issues at all
for almost all purposes in most parts of the world (i.e. where
such networking is cheap).



Posted by on April 2, 2007, 9:19 pm
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On 3 Apr, 02:14, B...@hotmail.co.uk wrote:
> On 2 Apr, 15:38, qazmlp1...@rediffmail.com wrote:
>
> > On Apr 2, 5:38 pm, B...@hotmail.co.uk wrote:> On 2 Apr, 12:17,
qazmlp1...@rediffmail.com wrote:
> > > Cisco now has some excellent documents on its web site.
> > > Look for "System Reference Network Design" (SRND) for
> > > "Campus" networks.
>
> > >http://www.cisco.com/en/US/netsol/ns656/networking_solutions_program_...
>
> > That was a nice article and it was useful.
>
> > Btw, I would like to know what exactly/roughly can be the maximum
> > distance for a Campus network.
> > I understand that as we use L3 switches for the systems in the 2 LANs
> > to communicate, the distance can be more. But, still I feel there must
> > be a standard/typical definition for the Campus network and it must
> > mention about the distance.
>
>
> With the distances you mention there are no issues at all
> for almost all purposes in most parts of the world (i.e. where
> such networking is cheap).

For example - the largest corporation or university with
buildings spread accross the extremities of a large city
could use a "Campus Network Architecture" for its entire
network.

It stops being a Campus network when either
RTT becomes large, or when bandwidth is restricted
due to the high cost of communications links.



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