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List: ipng
Subject: RE: MLD MIB
From: "Wijnen, Bert (Bert)" <bwijnen () lucent ! com>
Date: 2001-01-26 11:39:29
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Comments inline
> ----------
> From: Peder Chr. Nørgaard[SMTP:Peder.C.Norgaard@ted.ericsson.dk]
> Sent: Wednesday, January 24, 2001 9:51 PM
> To: Wijnen, Bert (Bert)
> Cc: Peder Chr. Nørgaard; ipng@sunroof.eng.sun.com
> Subject: RE: MLD MIB
>
> On Wed, 24 Jan 2001, Wijnen, Bert (Bert) wrote:
>
> > >
> > > I have to disagree with the premises of this statement, if not the
> > > conclusion. This change does indeed change the semantics of the
> > > implementation, and also the value of the bytes on the wire. The
> > > InterfaceIndex and the Ipv6IfIndex are two different numbering
> schemes,
> > Oh... are they?
> > Then pls explain the difference between these two definitions:
>
> Of course. I cut a bit to emphasize:
>
> > Ipv6IfIndex ::= TEXTUAL-CONVENTION
> :
> > "A unique value, greater than zero for each
> > internetwork-layer interface in the managed
> ^^^^^^^^^^^^^^^^^^ ^^^^^^^^^
>
>
> > InterfaceIndex ::= TEXTUAL-CONVENTION
> :
> > "A unique value, greater than zero, for each interface or
> ^^^^^^^^^
> > interface sub-layer in the managed system. It is
> ^^^^^^^^^^^^^^^^^^^
>
> I read this as the difference between layer 3 only and all layers.
>
> Certainly the InterfaceIndex covers all layers. And I find in the
> IPV6-MIB a mapping from Ipv6InterfaceIndex to the InterfaceIndex - the MIB
> object ipv6IfLowerLayer - that mapping is meaningless if the two values
> are supposed to be identical! This forced me to interpret the two TCs as
> representing two independent numbering schemes.
>
Mmm... maybe... but I wonder if that was intentional.
Anyway... the ipv6mib design team is looking at these MIBs and
they will come up with proposed new (clariying text).
> > They seem very much the same to me.
> > And certainly, the data on the wire keeps to be an Integer32 with the
> > same range!! The same is true for the other editorial changes.
>
> Oh, yes, the *encoding* is identical. But if you - as I have done - has
> implemented IPV6-MIB according to abovementioned interpretation - the
> *values* are different.
>
> > > and replacing the latter with the former forces changes in all
> > > implementations. Cf discussion on the IPv6 Design Team homepage
> > I do not see what needs to be changed in implementations.
> >
> > > <http://www.ibr.cs.tu-bs.de/ietf/ipv6mib-dt>.
> > >
> > That Design Team has been becoming active again, and they currently
> > believe that it is best to get rid of Ipv6IfIndex. And they are looking
> at
> > existing MIBs that use this TC to see what changes are needed. And
> > they will soon submit I-Ds (I hope) to be discussed.
>
> That would please me - if this is to be done, it must be done soon.
> 'Cause that change *will* force me to change implementation. (no big
> deal, of course - actually a simplification.)
>
Good to hear it is a simplification in yoru eyes.
The DT is working hard on the MIBs. I hope to see I-Ds pretty soon now.
> >
> > > Unfortunately that discussion never reached a conclusion, so the
> MLD-MIB
> > > designers do not really have any guidance in the choice between the
> two
> > > schemes. Say, if the design team had concluded to do away with the
> > > Ipv6IfIndex in the IPV6-MIB and friends, the MLD-MIB should of course
> do
> > > the same.
> > >
> > > From my own position, the proposed change does not hurt, for I have
> not
> > > completed the implementation of the MLD-MIB. But anyone with a
> working
> > > implementation of MLD-MIB will have to modify code to adapt to this
> > > change.
> > >
> > As I said I doubt they have to change much code (if any). All depends a
> bit
> > on how an implementation was done. If anyone who implemented the MIB
> > and who sees a big issue with this editorial change... pls scream.
>
> Couldn't agree more. I'm not screaming. Just noticing :-)
>
Good. So I went ahead and asked RFC-Editor to make those "editorial changes"
Bert
> --peder chr.
>
> > Bert
> >
>
> --
> Peder Chr. Nørgaard Senior System Developer, M. Sc.
> Ericsson Telebit A/S tel: +45 89 38 52 53
> Skanderborgvej 232 fax: +45 89 38 51 01
> DK-8260 Viby J, Denmark mob: +45 21 28 66 58
> e-mail: Peder.C.Norgaard@ted.ericsson.dk
> (old e-mail 1992-2000: pcn@tbit.dk)
>
>
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