RE: RPR protection with MPLS

Although, RPR provides fast protection at the DL layer
I still feel multi-layer resiliency requires some
form of coordination. I feel, as MPLS and other
upper layers are attempting to protect faster than
before we may soon across situations like what Frank 
mentions here.

Raj Sharma
Luminous Networks.


--- Frank Kastenholz <[email protected]> wrote:
> At 06:09 PM 11/11/2002 -0800, George Suwala wrote:
> >Indeed successful RPR protection should not trigger
> MPLS protection (should have no impact on the MPLS
> protection).
> >
> >However if RPR protection fails, MPLS should be
> triggered to protect. The exact method of doing it
> could be an IPORPR discussion topic, with timeouts
> being one of the options (so MPLS could be
> configured to ignore failures unless they persist
> for more than say 100ms, which would indicate a
> failure of the underlying RPR layer)
> 
> Two questions
> 1. When the 802.17 ring has a failure and invokes
> its protection
>    procedure, do the higher layers see it as a brief
> failure in
>    the link (i.e. there is an "interface down" event
> followed a
>    few ms later by an "interface up" event) or does
> it happen
>    transparently, with no interface failure (i.e. it
> would appear
>    to the higher layers as just a brief moment of
> packet loss)
> 
> 2 If an 802.17 ring fails and can not go into
> single-ring-mode
>   for some reason, wouldn't it appear as a link
> failure to MPLS
>   causing MPLS mechanisms to invoke fast reroute,
> just as if, say,
>   a PPP link went kablooey or an ethernet lost its
> ether?
> 
> 
> Frank Kastenholz
> 
> 
> 
> >thanks
> >
> >George
> > 
> >At 02:41 PM 11/11/2002 -0800, Nader Vijeh wrote:
> >>RPR is supposed to provide a protected Data Link
> Layer and should hide the
> >>operation of the DL from upper layers, including
> MPLS. This implies that
> >>MPLS should not trigger a protection event, if the
> RPR has recovered from
> >>the fault.
> >>
> >>-----Original Message-----
> >>From: nitin panjwani [mailto:[email protected]]
> >>Sent: Monday, November 11, 2002 2:25 PM
> >>To: Frank Kastenholz; Glenn Parsons;
> [email protected]
> >>Subject: [IPORPR] RPR protection with MPLS
> >>
> >>
> >>Hi All,
> >>
> >>I am new to RPR world and probably have not great
> >>undrstanding of it yet.
> >>I was thinking how the network will work when
> there is
> >>mpls protection working over RPR network. Wouldn't
> >>this double protection delay the traffic and
> probably
> >>affect the throughput and speed. Is there any
> document
> >>available which talks about this and what are the
> >>thoughts of RPR gurus about it.
> >>
> >>Regards,
> >>Nitin 
> >>
> >>
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