The MPLS WG Archive

[Bala Rajagopalan <BRaja@tellium.com>]

Hi,

This is all rather mysterious. Following up
on Jonathan Lang's and Yakov's earlier questions,
could you please describe what the problem is
w.r.t fast reroute?

Also, in your draft, what's the need to specify
both ingress and egress interface identifiers
for EERO hops? isn't one of them enough?

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: Bora Akyol [mailto:akyol@pluris.com]
> Sent: Monday, February 26, 2001 6:49 PM
> To: Yakov Rekhter
> Cc: Bora Akyol; mpls@UU.NET
> Subject: Re: New Internet Draft on ERO
> 
> 
> At 3:14 PM -0800 2/26/01, Yakov Rekhter wrote:
> >Bora,
> >
> >>  My question is as follows:
> >>
> >>  How do you do fast reroute when you have unnumbered 
> interfaces in the
> >>  ERO as in the unnumbered draft? What out of band 
> information is added
> >>  to what's in the ERO when we do CSPF? Is everyone doing 
> it the same
> >>  way?
> >>
> >>  If we use the (newly defined) EERO then fast reroute is 
> the same for
> >>  both numbered and unnumbered interfaces and it actually 
> becomes quite
> >>  easy.
> >
> >Could you point me to the MPLS WG document(s) that specifies
> >how to perform fast re-route ?
> >
> >Yakov.
> 
> Well, there was the ID from George Swallow that we discussed in San 
> Diego. And then there were some discussions on the list that I 
> participated in 1998. Vishal Sharma et al, produced IDs on that 
> subject as well.
> 
> 
> Maybe it is time that we write a BCP on that topic. Would this fall 
> into CCAMP or MPLS? In the last IETF, **all** of the fast 
> reroute/recovery schemes were sent to CCAMP AFAIK.
> 
> I know how we implemented fast reroute and I am sure you know of at 
> least two implementations.
> 
> So if there is interest on the WG, I can volunteer to put together a 
> group of people to write such a BCP.
> 
> But my original question still stands,
> 
> how do you do fast reroute when you have unnumbered interfaces? It is 
> possible to do, but becomes much easier if you have the router ID as 
> part of the ERO subobject as we did in our EERO specification. Please 
> see draft-akyol-mpls-exp-ero-00.txt
> 
> 
> Regards
> 
> Bora
>