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Posted by Thrill5 on April 7, 2008, 11:35 pm
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> Hi.
> We have a situation where we have around 500 computers and servers that
> will be separated in to several (5-6) VLANS (currently they are all in
> the same network.
> The servers will be in a separate VLAN and a lot of traffic will go
> there. There won't be much traffic betwean the other VLANs.
>
> What would you sugest as a device that would route betwean the VLANS?
> The users are connected through Linksys Gigabit swithches, and I thought
> about using a Layer 3 switch to do the inter VLAN routing.
> In perticular I thought about using WS-C3750G-24TS-1U with an IP Base
> image (IP base supports static routes and RIP).
>
> Will this be a good solution? Is a C3750 enough for this or do I need a
> C3750E?
A 3750 has more than enough routing capability for this application. The
only reason to go with the a 3750E is if you need 10GE ports. The one thing
you need to watch out for is high CPU. The TCAM memory on the 3750 is
partitioned for layer 2 switching and layer-3 routing and depending on the
application, how much of TCAM is allocated to each may need to be tuned.
The command is "sdm prefer", and the default is "desktop" which optimizes
the TCAM for switching. You might have to change it to "sdm prefer
routing". If you see high CPU on the 3750 and you are doing routing on it,
it's almost always due to TCAM memory allocation.
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