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Re: definition of terms in Ethernet Switch
- To: "Linux-IL Mailing List" <linux-il(at-nospam)linux.org.il>, "N Sakthivel" <svel(at-nospam)plasma.ernet.in>
- Subject: Re: definition of terms in Ethernet Switch
- From: "Joe" <joe_t_c(at-nospam)hotmail.com>
- Date: Sat, 9 Dec 2000 21:14:55 +0200
- Delivered-To: linux.org.il-linux-il@linux.org.il
- References: <Pine.GSO.4.10.10012091511120.22600-100000@sun4.plasma.ernet.in>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
> 1. Buffer : Dynamic per port
A buffer is memmory that is allocated to hold recived packets before the
packets can be written out onto the exiting port. Dynamic allocation means
that it is given out on a needed basis .If it is dynamic per port , then the
switch allocates the available memmory to the used ports.if you have 256K ,
and 10 ports are in use each port should get 25.6K
2. Flash memory :
Refers to memmory that can be written to , although is done so infrequently.
This type of memmory dosen't lose information a a power off. In a switch ,
it is generally used to hold the switch's operating system .(perhaps the
Cisco IOS an most of the newer Catalyst switches)
> 3. CPU DRAM :
DRAM is general porpose memmory that can be read and written to quickly. It
will lose its information aon a power off. In a switch , it mioght be used
to hold the mac-address-tables and the runtime configuration.
> The question is:
>
> 1. Is it not the total RAM is equally divided to all ports, if all port
> are in use.
> 2. What is meant by flash memory?
>
>
> Thanks in Advance
>
> N. Sakthivel
> ------------
>
>
>
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