I would think the process of directing to the lest loaded server would be
higher in the stack than level 4. Except that the Alteon uses some statefull
firewall like table where it remembers the sessions going in to each server,
it would probably work best if all the servers are of alike power, wouldn't
it? Also, most applications that need a certain QoS would need higher layer
switching, as L3 alone won't cut it.
Francisco Muniz
"Arigo, Francis" <[EMAIL PROTECTED]> escribió en el mensaje de noticias
[EMAIL PROTECTED]
> We use an Alteon Web Switch that uses "layer 4 switching". I don't know if
> the concept is the same for cisco switches, but this is how it works on
the
> Alteon:
>
> Each web site is assigned a "virtual IP" that is not assigned to any host;
> it is defined in the switch config. Then we have the web servers that have
> different real IP addresses. When someone requests a web page, it resolves
> to the "virtual IP" address. Then the Alteon does some processes in Layer
4
> to determine which web server has the least load, then routes the request
to
> that server.
>
> I'm sure that Layer 4 switching is not limited to just web switching, but
I
> haven't seen it used for anything else. Does anyone else have any
experience
> with it?
>
> Hope that helps with the concept,
> Francis Arigo, MCSE, CCNA
> System Administrator
> Classroom Connect
>
> -----Original Message-----
> From: Ms. Maria [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, June 14, 2000 7:58 PM
> To: [EMAIL PROTECTED]
> Subject: Layer 3 switching vs. Layer 4 switching?
>
>
> Hi,
>
> I was reading Karen Webb book on Building Cisco Multilayer Switched
Networks
>
> (BCMSN). I came across some information on Layer 4 switching that somehow
I
> didn't understand. It says that "Layer 4 switches refer to Layer 3
hardware
> based routing that consider the applications. "
> I understand the Layer 3 switching that is not logical and etc. But what
> about Layer 4 switching??? What new Switches and Routers are supporting
> Layer 4 (Transport Layer) switching?
> If Layer 3 and Layer 4 switching is same than is there any difference?
> Any responses are welcome on this topic.
>
> Thanks for your time!
>
> Maria
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