Layer 4 switching means that a router can forward packets based on L4
information such as TCP port #. This can be used to prioritize specific
applications and is currently supported by most vendors. Products from
vendors such as Allot, Top Layer and others can even make decisions based on
higher level information such as URL. Even more fine grained policy can be
enforced using "cookie" switching from vendors such as Arrowpoint (now
Cisco), Alteon, Foundry and Extreme (with F5 technology).
Irwin
-----Original Message-----
From: Ms. Maria [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 14, 2000 10:58 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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