Cell Relay Archive

[Afroz Lateef <afroz.lateef@fnc.fujitsu.com>]

Thomas and Charles,

PNNI does have re-routing facilities (of course, for  SPVCs and SPVPs only).
Crankback and re-routing in the PNNI spec, I guess talk about this.
VNN is not Lucent's proprietary, it is part of the specs. (VNNI and VUNI).

Afroz Lateef
Fujitsu Network Communications


Thomas Frieling wrote:

> Charles McCane schrieb:
> >
> > (...)
> > Today, large ATM networks rely on dynamic routing protocols  such as PNNI
> > which is based on Dykstra's SPF algorithm. "Soft" PVC's and SVC's are
> > automatically rerouted when network failures occur. With our carrier ATM
> > switches, the reroute occurs much faster than with typical IP solutions such
> > that no data connections over the ATM network will time out.
>
> PNNI has no built in rerouting capabilities, has it? Nortel
> Passport for example uses standard OAM-cells to detect a failure
> and then initiates the PNNI-based setup of a new SPVC (if it is
> configured to do so).
> I think only vendor specific call routing protocols like Lucent's
> VNN may have rerouting features built in. Or have I overlooked
> something new?
>
> > (...)
> > FYI, a "Soft" PVC is nothing more than an SVC that is nailed up permanently.
>
> ... by operators and not by endsystems/users.
>
> Thomas Frieling
>
> (comp.dcom.lans.ethern is not reachable via my usenet access)
>
> >
> > --
> > Charles McCane
> > Senior Systems Engineer
> > Lucent  Technologies - Service Provider Networks
> > MCIWorldcom Account Team Dallas, TX.