The MPLS WG Archive

[Bala Rajagopalan <BRaja@tellium.com>]

hi ping:

The precise problem addressed and the network
node capabilities are described in
our draft 

http://www.ietf.org/internet-drafts/draft-bala-restoration-signaling-00.txt

Regards,



Bala Rajagopalan
Tellium, Inc.
2 Crescent Place
P.O. Box 901
Oceanport, NJ 07757-0901
Tel: (732) 923-4237
Fax: (732) 923-9804
Email: braja@tellium.com 

> -----Original Message-----
> From: Ping Pan [mailto:pingpan@juniper.net]
> Sent: Sunday, May 27, 2001 2:08 PM
> To: Bala Rajagopalan
> Cc: 'C. R. Kalmanek'; ccamp@ops.ietf.org; mpls@UU.NET
> Subject: Re: GMPLS Last Calls
> 
> 
> Bala Rajagopalan wrote:
> > 
> > Hi,
> > 
> > There are two aspects to this problem:
> > 
> > Pre-establishment of protection paths: This
> > is something requiring signaling support during
> > provisioning. Don't see any problem in supporting
> > this under the current GMPLS framework.
> > 
> > Real-time restoration signaling: Our
> > view is that a dedicated lightweight protocol
> > is appropriate. (of course, there are other
> > views on this :-). )
> > 
> 
> Hi,
> 
> Many backbone links are SONET, which can redirect traffic to a backup
> channel within 50 msec. This is the requirement that we are 
> dealing here
> in MPLS. So in backbone, we have to rely on pre-established LSP' for
> restoration. I doubt there is any simple method for network nodes to
> detect link failure, setup a new session and adjust all sort 
> of stuff on
> *real-time*.  I could be wrong. Does anybody have the 
> measurement timing
> data on ATM crankback?
> 
> IMHO, the only reason for using real-time restoration signaling is to
> satisfy end-user applications, where based on the network 
> feedback, the
> user application can apply various adaptive mechanisms to renew
> sessions. I don't think this is the within the framework of MPLS.
> 
> 2 cents,
> 
> - Ping
> 
> > I don't see an obvious show-stopper here w.r.t
> > progressing the current drafts for last call.
> > 
> > Regards,
> > 
> > Bala Rajagopalan
> > Tellium, Inc.
> > 2 Crescent Place
> > P.O. Box 901
> > Oceanport, NJ 07757-0901
> > Tel: (732) 923-4237
> > Fax: (732) 923-9804
> > Email: braja@tellium.com
> >
>