Cell Relay Archive

["Erick B" <sirrom@hushmail.com>]

Some devices only go up to a certain VCI/VPI range and then loop and start
incrementing again. One vendor out there only goes up to 500 then loops. You
may want to check these limits if using different devices / vendors.

Paul Koning <pkoning@xedia.com> wrote in message
376E7D7C.E8BFD091@xedia.com">news:376E7D7C.E8BFD091@xedia.com...
Meng-Hsi Chiu wrote:
>
>     Becaue the ATM forum recommendations, VCI range from 0 to 31 must
> reserve for
>
> special usage. So the user's VCI is ranging from 32 to 65535 in theory.
> My question
>
> is:
>
>     How the ATM switch will assign the VCI range? Is it assigned from
> VCI=32, then
>
> VCI=33, then VCI=34, then VCI=35? If the first connection(its VCI=32)
> release
>
> connection now, what VCI number will be assigned for next call setup,
> whether it is
>
> 32 or 36?  It is important to us, please answer me.

It depends on the switch.  I don't know any specific rules used;
certainly the standards have nothing to say about it.

Why is it important?  Or rather, if it's important in your system
you probably have a bad design decision somewhere, because nothing
in your design should depend on a particular assignment rule.

paul