CCNP - Layer 3 swicth ???

Author

Layer 3 swicth ???

zarcoff

2004-10-04, 4:02 am

Could some one give me a greater undear standing of layer 3 swicths' i know they work at layer 3 of the OSI model could i have more information please.

Great thanks
Zarcoff

peterd

2004-10-04, 4:21 am

Hi,

basically routers normally do their calculations, etc, in memory which is slow whereas switches do it in hardware (special chips called ASICs) which is fast (almost wire speed).

So layer 3 switching is routing using hardware (ASICs) and runs hundreds of times faster than standard routing.

Layer 4 switching is the same thing but it switches (routes) on the TCP Port number rather than the IP address.

I'm sure a few people will jump in with add-ons but that's the simple version.

Regards
Peter

haseeb_eng

2004-10-16, 6:56 am

http://www.cisco.com/application/pd...a00800e79ce.pdf

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