Cell Relay Archive

[Brian McBride <brian.mcbride@sympatico.ca>]

The most common ATM Traffic Mgt question i get is:  "How in the world do I
configure MBS?".

In your setting for a 10/100 Ethernet this amounts to something like sending a
burst of 2 MTU=1516 frames at 10Mb/s with an idle period of about 24 MTU frames
before the next burst is allowed/accepted.  That is assuming I did my
arithmetic correctly.

Daigorho Chiang wrote:

> How to determine if MBS setting is enough? Our vendor said that the setting
> of the ethernet port at NIU is
> PCR = 10Mbit/s
> SCR = 800kbit/s
> MBS = 64 cell
>
> Is that reasonable? How to determine it? Is it enough for internet access
> via this port for multi-users?
>

That is very hard to answer, it seems to me it is never enough.  However for
multi-user environment a larger MBS can be good.  How large is a function of
how many users you are talking about.

> Your refer web page is to expand this is highly appreciated.
>
> Daigorho

  For details on ATM TM I would recommend reading the book by Natalie Giroux
(past chair of the ATM Forum TM group) and Sudhakar Ganti titled something like
"ATM Networks:  State of the art traffic management".  Yes I worked for
Natalie, but I don't anymore and it is the best ATM TM reference I know of.  No
kick backs for this rec ;-).

Cheers,
Brian

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