Switch or Router for routing betwean VLANS with 500 computers

Switch or Router for routing betwean VLANS with 500 computers

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Subject Author Date
Switch or Router for routing betwean VLANS with 500 computers Morph 04-07-2008
Posted by Morph on April 7, 2008, 12:23 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?

Posted by Trendkill on April 7, 2008, 12:44 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?

While it completely depends on traffic between vlans and/or across
trunks from a pure utilization perspective, either switch will have
enough routing capability to handle this. You are talking a half
dozen routed interfaces at most, and 500 nodes, should be completely
fine. We'll see what the others think, but I would not see any
problem with this setup.

Posted by Morph on April 7, 2008, 12:53 pm
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In the message
Trendkill wrote:

| > 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?
|
| While it completely depends on traffic between vlans and/or across
| trunks from a pure utilization perspective, either switch will have
| enough routing capability to handle this. You are talking a half
| dozen routed interfaces at most, and 500 nodes, should be completely
| fine. We'll see what the others think, but I would not see any
| problem with this setup.

Hi Trendkill. Thanx for your reply.

The nodes are connected to 7 - 48 port Linksys gigabit switches, and 4
24 port switches (for the moment) so there will be 11 or 12 routed
interfaces on the C3750.

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.




Posted by Merv on April 8, 2008, 5:37 am
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With 500 users you may want to give consideration to having two layer
3 switches for redundancy.

The layer 2 access switches would be dual-homed to the layer 3
switches


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