Subject: RE: I-D Action: draft-ietf-rtgwg-ipfrr-ip-mib-03.txt

From: <[email-masked]>
Date: Tue, 3 Jun 2014 10:39:21 +0000

Ok thanks Bruno

I will take this into account.

-----Message d'origine-----
De : DECRAENE Bruno IMT/OLN 
Envoyé : vendredi 30 mai 2014 14:36
À : LITKOWSKI Stephane SCE/IBNF; [email-masked]
Objet : RE: I-D Action: draft-ietf-rtgwg-ipfrr-ip-mib-03.txt

Hi Stéphane,

Please see 1 point inline

> Hi Stéphane,
> 
> Looks good, thanks.
> 
> I have a question related to object "ipFrrAltType"
> 
> >       loopFreeRemote (4), -- remote loop free alternate
> >       loopFreeTunnel (5), -- loop free alternate using a configured 
> > tunnel
> 
> >       loopFreeRemote : remote LFA as described in 
> > draft-ietf-rtgwg-remote-
> lfa
> >       loopFreeTunnel : remote LFA reachable through a RSVP-TE or GRE 
> > tunnel
> 
> It's not clear to me what exactly is the difference between 
> loopFreeRemote and loopFreeTunnel:
> Is this the type of tunnels: explicitly routed (i.e. RSVP-TE) vs 
> following the shortest path (i.e. LDP, GRE, 
> draft-ietf-rtgwg-remote-lfa Is this the determination of the required 
> tunnels: automatically computed (i.e. draft- ietf-rtgwg-remote-lfa, 
> automatic RSVP-TE LSP bypass tunnel to the next-
> hop) vs configured.
> 
> 
> 
> Current description seems to mix both aspects.
> 
> [SLI] Good point ! :) I had some concern to express this ... the idea 
> was to differentiate rLFA alternates (based on the draft) from other 
> tunneled alternate. If you have a good way to express it , I will take it ...
> 
> > loopFreeTI : remote LFA reachable through a SPRING tunnel
> To some expect, the question also applies to "loopFreeTI" where there 
> is a mix of FRR algorithm (how is the alternate computed i.e. TI FRR) 
> and the type of tunnels to reach the alternate (here SPRING tunnels, 
> while in theory the alternate could equally be reached using a 
> RSVP-TE+ T-LDP tunnels
> 
> I'm open to any solution. IMHO the description of the FRR algo is the 
> more
> important:
>       ipFrrAltType OBJECT-TYPE
>           SYNTAX   INTEGER {
>                       other             (1), -- type not defined
>                       equalCost         (2), -- primary path
>                       loopFreeConnected          (3), -- loop free connected alternate
> (LFA)
>                       loopFreeRemote    (4), -- remote loop free alternate (RLFA)
>                       loopFreeNH    (5), -- loop free alternate using a tunnel toward the
> Next Hop
>                       loopFreeNNH    (6), -- loop free alternate using a tunnel toward
> the Next Next Hop
>                       loopFreeTI        (7), -- loop free alternate using topology
> independent algorithm
>                       mrt               (8)  -- Maximally Redundant Trees
>                    }
> 
> [SLI] Agree, but in your proposal what is exactly loopFreeNH and 
> loopFreeNNH ?

loopFreeNH or may be "Next Hop" :  Next Hop (5), -- loop free alternate using an explicitly routed  tunnel toward the original Next Hop (link protection only) This typically what is offered by a single hop RSVP-TE LSP over the protected link.

NextNextHop    (5), -- loop free alternate using an explicitly routed  tunnel toward the original Next Next Hop

By "original Next Hop" I mean the Next Hop in the current IGP topology (aka "old" during FRR activation/pre failure)

Thanks,
Bruno

> If you believe that we also need the type of tunnels/forwarding 
> infrastructure, another object could be added
>       ipFrrTunnType OBJECT-TYPE
>           SYNTAX   INTEGER {
>                       other             (1), -- type not defined
>                       LDP         (2)
>                       IP          (3),  GRE, L2TP...
>                       RSVP-TE   (4)
>                       SPRING MPLS  (5)
>                       SPRING IPv6  (6)
>                       Multi-topology (7)
>                    }
> 
> [SLI] Yes , this may be very interesting, I will add it.
> 
> 
> Bruno
> 
> > -----Original Message-----
> > From: rtgwg [mailto:[email-masked]] On Behalf Of 
> > [email-masked]
> > Sent: Wednesday, May 28, 2014 9:18 AM
> > To: [email-masked]
> > Subject: FW: I-D Action: draft-ietf-rtgwg-ipfrr-ip-mib-03.txt
> >
> > Hi all,
> >
> > To followup discussion in London, I updated the IP FRR MIB draft 
> > with some new things :
> > - different objects for IPv4 and IPv6 protection stats
> > - Interface configuration table
> > - IPFRR instance table as we may expect to have multiple flavors 
> > running on a common node
> > - Protectstats per instance table.
> > - Few other things
> >
> > Feel free to comment and propose addings/corrections.
> >
> >
> > Stephane
> >
> >
> >
> > -----Original Message-----
> > From: I-D-Announce [mailto:[email-masked]] On Behalf 
> > Of [email-masked]
> > Sent: Tuesday, May 27, 2014 23:36
> > To: [email-masked]
> > Cc: [email-masked]
> > Subject: I-D Action: draft-ietf-rtgwg-ipfrr-ip-mib-03.txt
> >
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> >  This draft is a work item of the Routing Area Working Group Working 
> > Group of the IETF.
> >
> >         Title           : IP MIB for IP Fast-Reroute
> >         Authors         : Alia Atlas
> >                           Cisco Systems
> >                           John Flick
> >                           Stephane Litkowski
> > 	Filename        : draft-ietf-rtgwg-ipfrr-ip-mib-03.txt
> > 	Pages           : 26
> > 	Date            : 2014-05-27
> >
> > Abstract:
> >    This draft defines a portion of the Management Information Base (MIB)
> >    for use with network management protocols in the Internet community.
> >    In particular, it describes managed objects relevant for IP routes
> >    using IP Fast-Reroute [RFC5714]
> >
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-rtgwg-ipfrr-ip-mib/
> >
> > There's also a htmlized version available at:
> > http://tools.ietf.org/html/draft-ietf-rtgwg-ipfrr-ip-mib-03
> >
> > A diff from the previous version is available at:
> > http://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-ipfrr-ip-mib-03
> >
> >
> > Please note that it may take a couple of minutes from the time of 
> > submission until the htmlized version and diff are available at tools.ietf.org.
> >
> > Internet-Drafts are also available by anonymous FTP at:
> > ftp://ftp.ietf.org/internet-drafts/
> >
> > _______________________________________________
> > I-D-Announce mailing list
> > [email-masked]
> > https://www.ietf.org/mailman/listinfo/i-d-announce
> > Internet-Draft directories: http://www.ietf.org/shadow.html or 
> > ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> >
> >
> __________________________________________________________
> >
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a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.

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