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Posted by on March 30, 2007, 1:20 pm
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Hi,
I'm a college student & my final year project is to upgrade &
reconfigure my college network... The college has 700 PC's. It's an
adhoc network. I have recommended VLANS. In all there will be 7
VLANS. I want to know which model of Layer 3 switches I should
recommend to the college. It shouldn't be very costly. Please give me
your suggestions/ recommendations.
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Posted by Rick Jones on March 30, 2007, 2:08 pm
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Purist wording nit-pick follows :)
Packets at layer 3 are not switched. They are routed.
Switching is what is done with packets at layer 2.
Marketroids and salescritters will often tag a device as a "Layer N
Switch" because they believe it will sound better - in olden days it
was presumed that "switching" was faster than "routing" so even though
what happens at layer 3 is routing they call it switching.
Naming can get really "fun" when multiple functions are combined
within a single box :)
Now, having been nitpicky, I'll point to http://www.hp.com/go/procurve
which will have a number of devices with both switching and routing
capability. Alas I have no control over whether or not they call
routing layer 3 switching :)
rick jones
--
oxymoron n, commuter in a gas-guzzling luxury SUV with an American flag
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
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Posted by glen herrmannsfeldt on March 30, 2007, 4:47 pm
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Rick Jones wrote:
> Purist wording nit-pick follows :)
> Packets at layer 3 are not switched. They are routed.
> Switching is what is done with packets at layer 2.
I am not so sure how the words are supposed to be defined,
but I might say that if it was done at the hardware level,
including hardware (or FPGA) implementations of state
machines, then I wouldn't mind it being called switching.
Software has to update the tables needed by the hardware.
Hardware changes the source and destination MAC address,
increments the TTL, and modifies the checksum as appropriate.
That is different enough from software routers that it
deserves a different name. I have no idea how layer 3
switches are actually implemented.
-- glen
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Posted by stephen on March 30, 2007, 4:02 pm
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> Hi,
> I'm a college student & my final year project is to upgrade &
> reconfigure my college network... The college has 700 PC's. It's an
> adhoc network. I have recommended VLANS. In all there will be 7
> VLANS.
i suggest you start with stating the problem you want to solve not how you
want to solve it.
once you have that the rest of the limits you have to work to get clearer.
So - QoS needed?
Power over Ethernet?
a few big switches or lots of small ones?
Or - start with some sort of reference design to show you how it is done,
and then try to translate that into something you can build.
Cisco have some good design docs that explain general principles as well as
how they suggest you apply their products - have a look at:
http://www.cisco.com/en/US/netsol/ns656/networking_solutions_design_guidances_list.html#anchor2
I want to know which model of Layer 3 switches I should
> recommend to the college. It shouldn't be very costly. Please give me
> your suggestions/ recommendations.
The design may get cheaper if you only use layer 3 in some locations - maybe
just for 1 or 2 core switches.
The rest of the devices could be layer 2 only, which are often cheaper (or
the same device, but without an extra L3 software licence).
Again - look at design and decide which features you need, then go shopping.
>
--
Regards
stephen_hope@xyzworld.com - replace xyz with ntl
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